Heat transfer enhancement in the boundary layer flow of hybrid nanofluids due to variable viscosity and natural convection
Applied mathematics; Computational mathematics; Mechanics
The aim of the current work is to explore how heat transfer can be enhanced by variations in the basic properties of fluids in the presence of free convection with the aid of suspended hybrid nanofluids. Also, the influence of the Laurentz force on the flow is considered. The mathematical equations are converted into a pair of self-similarity equations by applying appropriate transformations. The reduced similarity equivalences are then solved numerically by Runge-Kutta-Fehlberg 45 th -order method. To gain better perception of the problem, the flow and energy transfer characteristics are explored for distinct values of significant factors such as variable viscosity, convection, magnetic field, and volume fraction. The results acquired are in good agreement with previously published results. The noteworthy finding is that the thermal conductivity is greater in hybrid nanofluid than that of a regular nanofluid in the presence of specified factors. The boundary layer thickness of both hybrid nanofluid and normal nanofluid diminishes due to decrease in variable viscosity. The fluid flow and temperature of the hybrid nanofluid and normal nanofluid increases as there is a rise in volume fraction. 2019
Manjunatha S.; Ammani Kuttan B.; Jayanthi S.; Chamkha A.; Gireesha B.J.
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.1016/j.heliyon.2019.e01469 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063763417&doi=10.1016%2fj.heliyon.2019.e01469&partnerID=40&md5=f7d788b962914cb5f480b992f0ff3a10
Manjunatha S., Department of Mathematics, Faculty of Engineering, CHRIST (Deemed to be University), Bengaluru, 560076, Karnataka, India; Ammani Kuttan B., Department of Mathematics, Faculty of Engineering, CHRIST (Deemed to be University), Bengaluru, 560076, Karnataka, India; Jayanthi S., Department of Mathematics, BMS College of Engineering, Bengaluru, 560019, Karnataka, India; Chamkha A., Mechanical Engineering Department, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar, 31952, Saudi Arabia, RAK Research and Innovation Center, American University of Ras Al Khaimah, P.O. Box 10021, Ras Al Khaimah, United Arab Emirates; Gireesha B.J., Department of Studies and Research in Mathematics, Kuvempu University, Shankaraghatta, Shimoga, 577 451, Karnataka, India
Heat transfer enhancement using temperature-dependent effective properties of alumina-water nanoliquid with thermo-solutal Marangoni convection: A sensitivity analysis
Marangoni boundary layer flow; Modified Buongiorno model; Nanofluid; Response surface methodology (RSM); Sensitivity analysis
The sensitivity of the heat transport rate in the thermo-solutal Marangoni convection of Al 2O 3- H 2O nanoliquid at 300K is analyzed. The nanoliquid is modeled using the modified Buongiorno model which incorporates the Brownian motion, effective nanoliquid properties, and thermophoresis effects. The thermophysical models proposed by Khanafer and Vafai are chosen in this analysis as these correlations are in good agreement with the experimental values. External constraining factors like thermal radiation and variable magnetic field are also considered. The basic equations are solved using apposite transformation variables and Finite Difference Method (FDM). The impacts of the effectual parameters on all the profiles are analyzed. Furthermore, the heat transport is analyzed by executing a Response Surface Methodology (RSM) model with the Brownian motion parameter (0.1 ? Nb ? 0.5), thermophoretic parameter (0.1 ? Nt ? 0.5), and nanoparticle volume fraction (1 % ? ?? 3 %). The modified Buongiorno model yields lower temperature and concentration profiles when compared to the conventional Buongiorno model. The heat transfer rate is the most sensitive to the Brownian motion parameter than thermophoresis and nanoparticle (NP) volume fraction parameters. The results of this study would be instrumental in improving the efficiency of the welding process, crystal growth, and coating technologies. 2021, King Abdulaziz City for Science and Technology.
Applied Nanoscience (Switzerland), Vol-13, No. 1, pp. 255-266.
Springer Science and Business Media Deutschland GmbH
Mackolil J., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India
Heat transfer in a dissipative nanofluid passing by a convective stretching/shrinking cylinder near the stagnation point
This contemporary article examines the transfer of heat properties and the flow behavior of water-based nanofluid suspended with silver nanoparticles. These silver nanoparticles have a very huge thermal conductivity and hence it is presumed that the resulting nanofluid shall have enhanced thermal conductance. This article is more focused on the study of (Formula presented.) nanofluid flowing past a cylinder that is modeled mathematically using the cylindrical coordinate system. The initial modeling is designed using a system of partial derivatives while at a later stage, this system is transformed into a nonlinear group of ordinary differential equations (ODEs). The equations in this system are solved to obtain the dual solutions by implementing the RKF-45 method which has a greater rate of convergence and additionally, it is computationally very effective. The findings of the study are dealt by plotting graphs and the discussions are based on the appearance of graphs. It is further noticed that the critical point (Formula presented.) remains constant at (Formula presented.) for any changes made in the values of heat generation/absorption coefficient. Similarly, the critical value remains constant at (Formula presented.) for any change made in the values of the Eckert number. Meanwhile, it is also observed that the increase in the Eckert number increases the temperature absorbed by the nanofluid whereas it decreases the Nusselt number. Furthermore, the higher values of the velocity slip reduce the skin friction coefficient. 2023 Wiley-VCH GmbH.
Khan M.R.; Puneeth V.; Alaoui M.K.; Alroobaea R.; Abdou M.M.M.
ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik, Vol-104, No. 3
https://doi.org/10.1002/zamm.202300733 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85177449464&doi=10.1002%2fzamm.202300733&partnerID=40&md5=428699068df1c0e56fc8de5dfbf3ef6f
Khan M.R., Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan; Puneeth V., School of Sciences, CHRIST University, Delhi NCR, Ghaziabad, India; Alaoui M.K., Department of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia; Alroobaea R., Department of Computer Science, College of Computers and Information Technology, Taif University, Taif, Saudi Arabia; Abdou M.M.M., Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia, Department of Mathematics, Faculty of Science, Aswan University, Aswan, Egypt
Heat transfer in the flow of blood-gold Carreau nanofluid induced by partial slip and buoyancy
boundary layer; buoyancy; heat transfer; magnetic field; partial slip; temperature distribution
Dynamics of blood containing gold nanoparticles on a syringe and other objects with a nonuniform thickness is of importance to experts in the industry. This study presents the significance of partial slip (i.e. combination of linear stretching and velocity gradient) and buoyancy on the boundary layer flow of blood-gold Carreau nanofluid over an upper horizontal surface of a paraboloid of revolution (uhspr). In this report, the viscosity of the Carreau fluid corresponding to an infinite shear-rate is assumed as zero, meanwhile, the viscosity corresponding to zero shear-rate, density, thermal conductivity, and heat capacity were assumed to vary with the volume fraction of nanoparticles. The governing equation that models the transport phenomenon were non-dimensionalized and parameterized using suitable similarity variables and solved numerically using classical RungeKutta method with shooting techniques and MATLAB bvp4c package for validation. The results show that temperature distribution across the flow decreases more significantly with buoyancy-related parameter when the influence of partial slip was maximized. Maximum velocity of the flow is ascertained at larger values of partial slip and buoyancy parameters. At smaller values of Deborah number and large values of volume fraction, maximum local skin friction coefficient, and local heat transfer rate are ascertained. 2018 Wiley Periodicals, Inc.
Koriko O.K.; Animasaun I.L.; Mahanthesh B.; Saleem S.; Sarojamma G.; Sivaraj R.
Heat Transfer - Asian Research, Vol-47, No. 6, pp. 806-823.
https://doi.org/10.1002/htj.21342 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052448353&doi=10.1002%2fhtj.21342&partnerID=40&md5=cff27356d9b1975f9ce8e3fda1759cf4
Koriko O.K., Department of Mathematical Sciences, Federal University of Technology, Akure, Nigeria; Animasaun I.L., Department of Mathematical Sciences, Federal University of Technology, Akure, Nigeria; Mahanthesh B., Department of Mathematics, Christ University, Bangalore, 560029, India; Saleem S., Department of Mathematics, College of Sciences, King Khalid University, Abha, 61413, Saudi Arabia; Sarojamma G., Department of Applied Mathematics, Sri Padmavati Mahila University, Tirupati, India; Sivaraj R., Department of Mathematics, VIT, Vellore, 632014, Tamil Nadu, India
Heat transfer of nanomaterial over an infinite disk with marangoni convection: A modified fouriers heat flux model for solar thermal system applications
Disk; Marangoni convection; Modified Fourier heat flux law; Nanofluid; Solar thermal exchangers; Thermal energy modulations
The demand for energy due to the population boom, together with the harmful consequences of fossil fuels, makes it essential to explore renewable thermal energy. Solar Thermal Systems (STSs) are important alternatives to conventional fossil fuels, owing to their ability to convert solar thermal energy into heat and electricity. However, improving the efficiency of solar thermal systems is the biggest challenge for researchers. Nanomaterial is an effective technique for improving the efficiency of STSs by using nanomaterials as working fluids. Therefore, the present theoretical study aims to explore the thermal energy characteristics of the flow of nanomaterials generated by the surface gradient (Marangoni convection) on a disk surface subjected to two different thermal energy modulations. Instead of the conventional Fourier heat flux law to examine heat transfer characteristics, the CattaneoChristov heat flux (Fouriers heat flux model) law is accounted for. The inhomogeneous nanomaterial model is used in mathematical modeling. The exponential form of thermal energy modulations is incorporated. The finite?difference technique along with Richardson extrapolation is used to treat the governing problem. The effects of the key parameters on flow distributions were analyzed in detail. Numerical calculations were performed to obtain correlations giving the reduced Nusselt number and the reduced Sherwood number in terms of relevant key parameters. The heat transfer rate of solar collectors increases due to the Marangoni convection. The thermophoresis phenomenon and chaotic movement of nanoparticles in a working fluid of solar collectors enhance the temperature distribution of the system. Furthermore, the thermal field is enhanced due to the thermal energy modulations. The results find applications in solar thermal exchanger manufacturing processes. 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Basavarajappa M.; Lorenzini G.; Narasimhamurthy S.; Albakri A.; Muhammad T.
Applied Sciences (Switzerland), Vol-11, No. 24
https://doi.org/10.3390/app112411609 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120805767&doi=10.3390%2fapp112411609&partnerID=40&md5=c4602789dd70a8fab689feb50c9467a9
Basavarajappa M., Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Lorenzini G., Department of Engineering and Architecture, University of Parma, Parco Area Delle Scienze 181/A, Parma, 43124, Italy; Narasimhamurthy S., Department of Mathematics, MS Ramaiah Institute of Technology, Bengaluru, 560054, India; Albakri A., Department of Computer Science, College of Computer Science & Information Technology, Jazan University, Jazan, 45142, Saudi Arabia; Muhammad T., Department of Mathematics, College of Sciences, King Khalid University, Abha, 61413, Saudi Arabia
Heat transfer optimisation through viscous ternary nanofluid flow over a stretching/shrinking thin needle
Heat transfer; nanoparticles; radiation; slip; ternary nanofluid
The current investigation interprets the flow and the thermal characteristics of the ternary nanofluid composed of MoS 2, ZnO, and SiO 2 spherical nanoparticles and water. The resulting nanofluid is (Formula presented.) where (Formula presented.) act as the base fluid which help in the flow and the nanoparticles contribute to enhancing the heat conductivity. The flow is assumed to occur across a thin needle whose surface is maintained at a higher temperature than the surroundings. The mathematical model is framed by incorporating radiation introduced by Rosseland in terms of partial differential equations (PDE). This system of equations governs the flow and thermal properties of fluid which are converted to a system of ordinary differential equations (ODE). The major outcomes of the study indicated that the increase in the amount of molybdenum disulfide enhanced the heat conducted by the nanofluid whereas it reduced the flow speed. The positive values of the heat source/sink parameter caused the heat conduction of the nanofluid to go high. 2023 The Author(s). Published with license by Taylor & Francis Group, LLC.
Yu L.; Li Y.; Puneeth V.; Znaidia S.; Shah N.A.; Manjunatha S.; Anwar M.S.; Riaz Khan M.
Numerical Heat Transfer; Part A: Applications
All Open Access; Green Open Access; Hybrid Gold Open Access
Yu L., School of Computer Science and Technology, Shandong Technology and Business University, Yantai, China; Li Y., School of Computer Science, University of St. Andrews, United Kingdom; Puneeth V., School of Sciences, CHRIST University, Ghaziabad, India; Znaidia S., Department of Physics, College of Sciences and Arts in Mahayel Asir, King Khalid University, Abha, Saudi Arabia; Shah N.A., Department of Mechanical Engineering, Sejong University, Seoul, South Korea; Manjunatha S., Department of Sciences and Humanities, CHRIST University, Bengaluru, India; Anwar M.S., Department of Mathematics, University of Jhang, Pakistan; Riaz Khan M., Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan
Yu, Liping; Li, Yijie; Puneeth, Venkatesh; Znaidia, Sami; Shah, Nehad Ali; Manjunatha, Sarpabhushana; Anwar, Muhammad Shoaib; Riaz Khan, Muhammad
Numerical Heat Transfer; Part A: Applications;Volume;86;Issue;3;pp.518-532
https://doi.org/10.1080/10407782.2023.2267750 https://www.scopus.com/pages/publications/105002263242?origin=resultslist
Heat transfer optimization and sensitivity analysis of Marangoni convection in nanoliquid with nanoparticle interfacial layer and cross-diffusion effects
Marangoni boundary layer; Nanofluid; Nanoparticle interfacial layer; Sensitivity analysis and optimization; Soret and Dufour effects
Heat and mass transfer induced by Marangoni forces occur frequently in crystal growth and heat pipes, especially in microgravity situations. Therefore, the heat and mass transfer optimization in the thermosolutal Marangoni boundary layer flow of a nanomaterial with cross-diffusion effects is carried out in this study. Thermal radiation, magnetic field, and cross-diffusion are also incorporated in the thermal phenomena. The flow fields with nanolayer and without it are compared. The nanoparticle interfacial layer aspect accounted for in the nanofluid model makes the modeling more realistic. The optimization procedure is based on the Response Surface Methodology (RSM) model that utilizes the face-centered Central Composite Design (fc-CCD). The external constraining factors of the system like thermal radiation, magnetic field, and nanoparticle loading are explored for interactive impacts. The sensitivity of the heat and mass transfer is scrutinized. The interfacial layer aspect leads to an enhanced magnitude of the temperature field whereas the effect on the concentration profile is negligible. The inclination of the magnetic field augments the flow profiles significantly. The highest sensitivity of the heat and mass transfer is towards the thermal radiation aspect. The optimized output of heat and transfer rate is estimated to be when R = 1.6639, M = 1, and ? = 1 %. 2021 Elsevier Ltd
International Communications in Heat and Mass Transfer, Vol-126
https://doi.org/10.1016/j.icheatmasstransfer.2021.105361 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106930535&doi=10.1016%2fj.icheatmasstransfer.2021.105361&partnerID=40&md5=a599f1bf5c8985d9b7d361178e8d0517
Heat transfer optimization of hybrid nanomaterial using modified Buongiorno model: A sensitivity analysis
Hybrid nanofluid; Modified Buongiorno model; Response surface methodology (RSM); Sensitivity analysis; Wedge flow
Sensitivity analysis of the heat transfer rate in the flow of the hybrid nanoliquid C2H6O2?H2O (base liquid) +MoS2?Ag (nanoparticles) over a wedge using the Response Surface Methodology (RSM) is carried out. The nanomaterial is modeled using the modified Buongiorno nanofluid model (MBNM) that considers the major slip mechanisms and the effective properties of the hybrid nanoliquid. Two distinct heat sources- linear thermal heat source and an exponential space-dependent heat source are taken into account. The governing nonlinear two-point boundary-layer flow problem is treated numerically. The effects of pertinent parameters on the flow fields in the boundary layer region are represented graphically with suitable physical interpretations. The exponential heat source and slip mechanisms are used to study the sensitivities of the heat transfer rate. Both heat source mechanisms lead to an improvement in the temperature profile, in which the effect of the exponential space-related heat source is predominant. The Brownian motion parameter was found to be the most sensitive to the heat transfer rate. 2021
Mahanthesh B.; Shehzad S.A.; Mackolil J.; Shashikumar N.S.
International Journal of Heat and Mass Transfer, Vol-171
https://doi.org/10.1016/j.ijheatmasstransfer.2021.121081 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101564858&doi=10.1016%2fj.ijheatmasstransfer.2021.121081&partnerID=40&md5=37269744b5ba1d83e68ddc2a9542c93f
Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, India; Shehzad S.A., Department of Mathematics, COMSATS University Islamabad, Sahiwal, 57000, Pakistan; Mackolil J., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, India; Shashikumar N.S., Department of Mathematics, Malnad College of Engineering, Hassan, 573202, India
Heat transfer simulation of reline flowing in an elliptic shaped duct: A deep eutectic solvent
Computational fluid dynamics (CFD); deep eutectic solvent; fluid flow; heat transfer; pressure; velocity
Deep Eutectic solvents have emerged as promising alternatives to conventional solvents due to their unique properties and applications. The flow of deep eutectic solvents in various industrial processes has garnered significant attention due to their versatile applications in fields ranging from chemical engineering to energy storage. This study presents a comprehensive mathematical model aimed at elucidating the intricate behavior of eutectic solvent flow within an elliptic duct, a geometric configuration relevant to many real-world systems. In this article, the deep eutectic solvent is composed of choline chlorideurea and is also called Reline. The proposed mathematical model accounts for the complex interplay of fluid dynamics, thermodynamics, and elliptic duct geometry. Key components of the model include the Navier-Stokes equations, which describe the fluid flow, coupled with heat transfer equations to account for temperature variations within the system. The model also considers the phase change behavior of the eutectic solvent, which may exhibit solidification or crystallization phenomena under certain conditions. Numerical simulations and analytical solutions are employed to investigate various aspects of eutectic solvent flow within elliptic ducts, such as velocity profiles, pressure distributions, temperature gradients, and phase transition phenomena. The study explores the influence of key parameters, including the Reynolds number, the aspect ratio of the duct, and the thermophysical properties of the eutectic solvent, on the systems behavior. From the results, it was clearly observed that the velocity at the narrow region decreased as the pressure raised and the Reynolds number profile indicated the presence of turbulent flow behavior. 2024 Taylor & Francis Group, LLC.
Xin X.; Narayan S.S.; Puneeth V.; Al-Yarimi F.A.M.; Khan M.R.
Numerical Heat Transfer, Part B: Fundamentals
Xin X., College of Foreign Studies, Shandong Technology and Business University, Yantai, China; Narayan S.S., Department of Mathematics and Statistics, Ramaiah University of Applied Sciences, Bengaluru, India; Puneeth V., Centre for Mathematical Needs, Department of Mathematics, CHRIST University, Bengaluru, India; Al-Yarimi F.A.M., Department of Computer Science, King Khalid University, Abha, Saudi Arabia; Khan M.R., Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan
Xin, Xiao; Narayan, Shankar S.; Puneeth, V.; Al-Yarimi, Fuad A. M.; Khan, M. Riaz
Numerical Heat Transfer, Part B: Fundamentals;Volume;87;Issue;1;Article No.;2342035;
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1080/10407790.2024.2342035 https://www.scopus.com/pages/publications/85191149069?origin=resultslist
Heat transport and stagnation-point flow of magnetized nanoliquid with variable thermal conductivity, Brownian moment, and thermophoresis aspects
Brownian motion; chemical reaction; heat source/sink; nanoliquid; stagnation-point flow; variable thermal conductivity
The improvement of heat transport is a very important phenomenon in nuclear reactors, solar collectors, heat exchangers, and coolers, which can be achieved by choosing the nanofluid as the functional fluid. Nanofluids improve thermophysical properties; as a result, they have made great progress in engineering, biomedical, and industrial applications. Therefore, a numerical study has been proposed to analyze the flow and heat transport of nanoliquids over an extendable surface near a stagnation point with variable thermal conductivity under the influence of the magnetic field, due to their importance in the engineering field. Nanoliquid attributes explain the Brownian motion and the diffusion of thermophoresis. The effects of the chemical reaction and the uniform internal heat source/heat sink are also considered. The Nachtsheim-Swigert shooting procedure based on the Runge-Kutta scheme is used for numerical calculation. The impact of effective parameters on velocity, temperature, and volume fraction of the nanoparticles is shown in the graphs and reported in detail. The surface criteria are also estimated with respect to the shear stress and the rate of heat and mass transfer. The aspects of the Brownian moment and Lorentz force are positively correlated to the thermal field of the nanoliquid. Also, the variable thermal conductivity aspect favors the growth of the thermal boundary layer. 2020 Wiley Periodicals LLC
Swain K.; Mahanthesh B.; Mebarek-Oudina F.
https://doi.org/10.1002/htj.21902 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096177594&doi=10.1002%2fhtj.21902&partnerID=40&md5=002585accda5a4da1092d60f6d599a43
Swain K., Department of Mathematics, Gandhi Institute For Technology, Bhubaneswar, Odisha, India; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, Karnataka, India; Mebarek-Oudina F., Department of Physics, Faculty of Sciences, University of Skikda, Skikda, Algeria
Heat transport in the flow of magnetized nanofluid over a stretchable surface with heat sources: A mathematical model with realistic conditions
Analyzing the heat transport of nanofluids is of prime importance to various industrial and engineering sectors which involves modeling the physical phenomena via highly nonlinear partial differential equations. In this study, the flow and heat transport of a nanoliquid on a bi-directionally elongating surface subject to two different heat modulations (linear temperature-related heat source and space-related exponential heat source) is investigated using the two-component Buongiorno nanoliquid model. The dynamics of the nanoliquid are altered by an external magnetic field applied perpendicular to the sheet. The impact of Brownian motion, Lorentz forces, and thermophoresis are analyzed under the realistic passive control of the nanoparticles. A comparative analysis of the flow over the linear and nonlinear drawn surface is presented. Numeric solutions for the governing partial differential system are obtained through the finite difference method (FDM). Among two types of heat source modulations, the maximum heat transport is observed in the presence of the exponential space-based heat source modulation. The flow and thermal fields are found to advance in the linear elongated surface flow than the nonlinear elongated flow. Furthermore, the random movement of the nanoparticles and the greater magnitude of the Lorentz force have a positive effect on the thermal enhancement in the nanoliquid system. The results of the study have applications in heating/cooling processes, nanoliquid-dependent structures, and thermal systems with stretchable materials. 2021 Wiley-VCH GmbH
ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik, Vol-102, No. 2
https://doi.org/10.1002/zamm.202100343 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117887848&doi=10.1002%2fzamm.202100343&partnerID=40&md5=8e11e512608f8f8fb06db2fbfe601af8
Mackolil J., Centre for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Karnataka, Bengaluru, India; Mahanthesh B., Centre for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Karnataka, Bengaluru, India; Muhammad T., Department of Mathematics, College of Sciences, King Khalid University, Abha, Saudi Arabia
Heat transport of hybrid nanomaterial in an annulus with quadratic Boussinesq approximation
annulus; hybrid nanoliquid; non-uniform heat source/sink; O368; quadratic Boussinesq approximation; response surface methodology (RSM); sensitivity analysis
The convective heat transfer of hybrid nanoliquids within a concentric annulus has wide engineering applications such as chemical industries, solar collectors, gas turbines, heat exchangers, nuclear reactors, and electronic component cooling due to their high heat transport rate. Hence, in this study, the characteristics of the heat transport mechanism in an annulus filled with the Ag-MgO/H2O hybrid nanoliquid under the influence of quadratic thermal radiation and quadratic convection are analyzed. The non-uniform heat source/sink and induced magnetic field mechanisms are used to govern the basic equations concerning the transport of the composite nanoliquid. The dependency of the Nusselt number on the effective parameters (thermal radiation, nonlinear convection, and temperature-dependent heat source/sink parameter) is examined through sensitivity analyses based on the response surface methodology (RSM) and the face-centered central composite design (CCD). The heat transport of the composite nanoliquid for the space-related heat source/sink is observed to be higher than that for the temperature-related heat source/sink. The mechanisms of quadratic convection and quadratic thermal radiation are favorable for the momentum of the nanoliquid. The heat transport rate is more sensitive towards quadratic thermal radiation. 2021, Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature.
Applied Mathematics and Mechanics (English Edition), Vol-42, No. 6, pp. 885-900.
Springer Science and Business Media B.V.
Thriveni K., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India
Heat transport of magnetized Newtonian nanoliquids in an annular space between porous vertical cylinders with discrete heat source
Cylindrical annulus; Darcy number; Heat source; Magnetohydrodynamics; Nanofluids; Natural convection; Porosity
A numerical study of MHD natural convection in an upright porous cylindrical annulus filled with magnetized nanomaterial is made by using the specificity of nanoliquids to improve the phenomenon of heat transport. The upper and lower walls are thermally insulated, whereas the outer wall is kept at a lesser temperature. The finite volume method is used to treat the governing equations via computer code with Fortran programming. The results obtained are given for the values of the Rayleigh number between 103 and 106, aspect ratio Ar = 2, radii ratio ? = 2, Hartmann number (0 ? Ha ? 80), Darcy number (10?5 ? Da ? 10?2), porosity ratio (0.1 ? ? ?0.9), and the nanoparticles volume fraction (0 ? ? ? 0.1). The transferred thermal flux, in laminar natural convection, increases with the growth of the nanoparticle concentration, the Darcy number, the porosity, the Rayleigh number and, the length of the source. 2020 Elsevier Ltd
Mebarek-Oudina F.; Aissa A.; Mahanthesh B.; top H.F.
International Communications in Heat and Mass Transfer, Vol-117
https://doi.org/10.1016/j.icheatmasstransfer.2020.104737 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087621962&doi=10.1016%2fj.icheatmasstransfer.2020.104737&partnerID=40&md5=b854265107ddc14f2a4f4991765f1bbe
Mebarek-Oudina F., Department of Physics, Faculty of Sciences, University of 20 ao 1955-Skikda, B.P 26 Road El-Hadaiek, Skikda, 21000, Algeria, LEAP Laboratory, Department of Mechanical Engineering, University of Mentouri-Constantine 1, Route de Ain El. Bey, Constantine, Algeria; Aissa A., Laboratoire de Physique Quantique de la Matie et Modisation Mathatique (LPQ3M), University of Mascara, Algeria; Mahanthesh B., Department of Mathematics, CHRIST (Deemed to be University), Bangalore, 560029, India; top H.F., Department of Mechanical Engineering, Technology Faculty, F?rat University, Elazig, Turkey, Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
Heat transport of nano-micropolar fluid with an exponential heat source on a convectively heated elongated plate using numerical computation
Chemical reaction; Convective condition; Exponential heat source; MHD; Micropolar fluid; Nanofluid; Numerical simulations
Purpose: The study of novel exponential heat source phenomena across a flowing fluid with a suspension of microparticles and nanoparticles towards a convectively heated plate has been an open question. Therefore, the impact of the exponential heat source in the transport of nano micropolar fluid in the existence of magnetic dipole, Joule heating, viscous heating and convective condition effects has been analytically investigated. Influence of chemical reaction has also been exhibited in this discussion. Design/methodology/approach: The leading equations are constructed via conservation equations of transport, micro-rotation, energy and solute under the non-transient state situation. Suitable stretching transformations are used to transform the system of partial differential equations to ordinary. The transformed ODEs admit numerical solution via RungeKutta fourth order method along with shooting technique. Findings: The effects of pertinent physical parameters characterizing the flow phenomena are presented through graphs and discussed. The inclusion of microparticles and nanoparticles greatly affects the flow phenomena. The impact of the exponential heat source (EHS) advances the heat transfer characteristics significantly compared to usual thermal-based heat source (THS). The thermal performance can be improved through the effects of a magnetic dipole, viscous heating, Joule heating and convective condition. Originality/value: The effectiveness of EHS phenomena in the dynamics of nano micropolar fluid past an elongated plate which is convectively heated with regression analysis is for the first time investigated. 2019, Emerald Publishing Limited.
Pattnaik P.K.; Mishra S.R.; Mahanthesh B.; Gireesha B.J.; Rahimi-Gorji M.
Multidiscipline Modeling in Materials and Structures, Vol-16, No. 5, pp. 1295-1312.
https://doi.org/10.1108/MMMS-12-2018-0222 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85083311219&doi=10.1108%2fMMMS-12-2018-0222&partnerID=40&md5=7ae43c9c855a1f091cce5bca33fb8468
Pattnaik P.K., Department of Mathematics, College of Engineering and Technology, Bhubaneswar, India; Mishra S.R., Department of Mathematics, Shiksha O Anusandhan (Deemed to University), Bhubaneswar, India; Mahanthesh B., Department of Mathematics, CHRIST, (Deemed to be University), Bangalore, India; Gireesha B.J., Department of Mathematics, Kuvempu University, Shimoga, India; Rahimi-Gorji M., Experimental Surgery Lab, Faculty of Medicine and Health Science, Ghent University, Ghent, Belgium, Tissue and Solid Mechanics for Medical Applications Lab (IBiTech, ? BioMMeda), Ghent University, Ghent, Belgium
Heavy metal contaminants in eggs and hatchlings of olive ridley turtles (Lepidochelys olivacea) at a mass nesting rookery in India
bioaccumulation; heavy metal; maternal transfer; olive ridley; pollution
Heavy metal pollution has emerged as a prominent threat in recent times with high metal levels widely reported in species across ecosystems. The threat of rapid biomagnification is particularly enhanced in species such as olive ridley turtles, which occupy a higher trophic position, increasing their exposure to heavy metals. In the current study, we examine the presence of heavy metals in adults, in-utero and oviposited eggs, hatchlings as well as the nesting beach at two important olive ridley rookeries in India Devi and Rushikulya. We collected muscle and in-utero egg samples from stranded adult olive ridleys at the two rookeries, while oviposited eggs, hatchling and sand samples were obtained from hatchery nests at Rushikulya. We compared concentrations of 9 heavy metals (Cr, Mn, Ni, Co, Cu, As, Se, Cd, and Pb) across different sample types in an Inductively Coupled Plasma Mass Spectrometer (ICP-MS). We found mean metal concentrations of sand to be highest among all samples analysed, followed by muscle tissue. Arsenic was the most prominent metal in adult turtles suggesting bioaccumulation, while Selenium was found to be higher in egg components. Heavy metals (HM) were found in-utero eggs, providing evidence of maternal transfer. Most HMs were similar for in-utero and oviposited eggs, though a few metals were higher in in-utero eggs suggesting potential leaching out during development. Sand and hatchling samples show a high correlation for Mn suggesting potential environmental transfer. These findings emphasise the risk posed by heavy metals to adult and early life stages of olive ridleys and highlight the urgent need for mitigation of these threats. Copyright 2026 Pradhan, Pusapati and Shanker.
Pradhan, Sharon; Pusapati, Chandana; Shanker, Kartik
Frontiers in Amphibian and Reptile Science;Volume;4;Issue;;Article No.;1791489;
https://doi.org/10.3389/famrs.2026.1791489 https://www.scopus.com/pages/publications/105040569896?origin=resultslist
Pradhan S., Department of Lifesciences, CHRIST (Deemed to be University), Karnataka, Bengaluru, India, Dakshin Foundation, Karnataka, Bengaluru, India; Pusapati C., Dakshin Foundation, Karnataka, Bengaluru, India, Laurentian University, Sudbury, ON, Canada; Shanker K., Dakshin Foundation, Karnataka, Bengaluru, India, Centre for Ecological Sciences, IISc Bangalore, Karnataka, India
Heavy metal detection by nanotechnology-based sensors
biosensors; heavy metals; Nanoparticles; remediation
One of the major pollutants in the milieu consists of heavy metals that remain nondegradable with extreme toxicity that accumulates in plants, animals, and humans leading to ill effects with long exposures. These heavy metals that are used in various fields like food, textile industries, agriculture, and medicine act as enzyme inhibitors not allowing the substrate to bind the enzymes. In lieu of it, biosensors have been an essential tool that help to monitor environmental pollutants, presence of various toxins and biohazardous microbial in the organic matter, and also biomolecules in diagnostic tools. Detection of heavy metal traces in environmental monitoring has a widespread application using biosensors with improvised sensitivity, selectivity, and simplicity. Further, the biosensor technology has advanced greatly with the ability of biosensing mechanism combined with the highly advanced technique with the world of nanofabricating enabled miniature biosensors. The sensitivity performance of biosensors has increased tremendously with nanotechnology as the nanoscale dimensions promote the critical analysis and detect to probe single biomolecules. Nevertheless, the major drawback relies on the study lacking the toxicity of nanoparticles (NPs) in atmosphere, lacking in automated service, miniature induced unreliable source, and integrating the nano-biosensors for reliable transduction signals from the devices. With the development of biosensors for online and offline analysis for their quantity and diversity they have been termed as biosensor uprising with the introduction of biosensors with enzyme, DNA-, immuno-, and whole cell-based with specific analytical detection. 2024 Elsevier Inc. All rights are reserved including those for text and data mining AI training and similar technologies.
Mayegowda S.B.; Chikkud V.; Barua S.; Manjula N.G.
Nanotechnology-Based Sensors for Detection of Environmental Pollution, pp. 237-263.
Mayegowda S.B., Department of Psychology, CHRIST (Deemed to be University), Bangalore Kengeri Campus, Karnataka, Bengaluru, India; Chikkud V., Department of Microbiology, School of Basic and Applied Sciences (SBAS), Dayananda Sagar University, Karnataka, Bengaluru, India; Barua S., Department of Microbiology, School of Basic and Applied Sciences (SBAS), Dayananda Sagar University, Karnataka, Bengaluru, India; Manjula N.G., Department of Microbiology, School of Basic and Applied Sciences (SBAS), Dayananda Sagar University, Karnataka, Bengaluru, India
Heavy metal ion sensing strategies using fluorophores for environmental remediation
Analytical techniques; Biological fluorophores; Environmental issues; Heavy metal ions; Organic dyes; Quantum dots
The main aim of this review is to provide a holistic summary of the latest advances within the research area focusing on the detection of heavy metal ion pollution, particularly the sensing strategies. The review explores various heavy metal ion detection approaches, encompassing spectrometry, electrochemical methods, and optical techniques. Numerous initiatives have been undertaken in recent times in response to the increasing demand for fast, sensitive, and selective sensors. Notably, fluorescent sensors have acquired prominence owing to the numerous advantages such as good specificity, reversibility, and sensitivity. Further, this review also explores the advantages of various nanomaterials employed in sensing heavy metal ions. In this regard, exclusive emphasis is placed on fluorescent nanomaterials based on organic dyes, quantum dots, and fluorescent aptasensors for metal ion removal from aqueous systems, and to identify the fate of heavy metal ions in the natural environment. 2024
Shanmugavel A.; Rene E.R.; Balakrishnan S.P.; Krishnakumar N.; Jose S.P.
ISSN: 139351; PubMed ID: 38969312; CODEN: ENVRA
https://doi.org/10.1016/j.envres.2024.119544 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85200471128&doi=10.1016%2fj.envres.2024.119544&partnerID=40&md5=77478c78683400a0fb41579c4daf21d8
Shanmugavel A., School of Physics, Madurai Kamaraj University, Tamil Nadu, Madurai, 625021, India; Rene E.R., Department of Water Supply, Sanitation and Environmental Engineering, IHE Delft Institute for Water Education, Westvest 7, 2601DA, Delft, Netherlands; Balakrishnan S.P., Department of Chemistry, CHRIST (Deemed to Be University), Karnataka, Bengaluru, 560029, India; Krishnakumar N., School of Physics, Madurai Kamaraj University, Tamil Nadu, Madurai, 625021, India; Jose S.P., School of Physics, Madurai Kamaraj University, Tamil Nadu, Madurai, 625021, India
Heavy metal stress influence the andrographolide content, phytochemicals and antioxidant activity of Andrographis paniculata
Andrographis paniculata; Andrographolide; Cobalt; Copper; Tin; Total flavonoids content; Total phenolic content
Heavy metals (HM) are toxic components present in the earth's crust that can have a negative impact on plants as well as animals. Andrographis paniculata or 'King of bitters' belonging to the family Acanthaceae, is a medicinal herb traditionally used in the treatment of fever, common cold etc. In the present study, the effect of heavy metals (copper, tin and cobalt) on the andrographolide content, biochemical parameters like chlorophyll, carotenoid, protein, Total phenolic content (TPC), Total flavonoid content (TFC) and antioxidant activity in A. paniculata were analysed. Saplings of A. paniculata were treated at 50 and 100 mM concentrations, three different times at a time interval of 7 days. Andrographolide production was found to increase in copper and cobalt treated saplings when compared with the control. From the results, maximum andrographolide concentration was found in the saplings treated with 50 mM copper (8.51 mg/gm of DW) and 50 mM tin (8.10 mg/gm of DW) respectively. 50 mM cobalt treated plants have shown the highest concentration of TPC (17.21 mg/g of extract) and TFC (6.97 mg/gm of extract). Notable variations in other biochemical parameters like total chlorophyll, carotenoid content and antioxidant activities were observed in all treatments compared with the control. Antony & Nagella (2021). This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited (https://creativecommons.org/licenses/by/4.0/).
Plant Science Today, Vol-8, No. 2, pp. 324-330.
Antony A., Department of Life Sciences, CHRIST (Deemed to be University), Bangalore, 560 029, India; Nagella P., Department of Life Sciences, CHRIST (Deemed to be University), Bangalore, 560 029, India