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Effects of mass transfer and MHD Casson nanofluid heat transfer on thermophoresis at stagnation point
(2025-05-01)
Seethamahalakshmi, V.
;
Venkata Kalyani, U.
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Padma, A.
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Nagalakshmi, P. S.S.
;
Ramana Reddy, G. V.
This study seeks to analyse the magnetohydrodynamic (MHD) flow of a nanofluid, focussing on heat and mass transfer in nano liquids over a stretchable surface near a stagnation point, while considering changeable thermal conductivity. The thermal behavior of the suspended nanoparticles is found to be significantly affected by Brownian motion. The influence of the chemical responses well as the continuous inner warmth source or washbasin are in addition taken into account. The governing equations are changed into a system of coupled ordinary differential equations utilising an appropriate similarity transformation. The computational software PYTHON is employed to address the boundary value problem (BVP) utilising the shooting method. The numerical results are supported by the online PYTHON software function bvp4c. The numerical results are derived by varying the values of the physical parameters associated with the flow problem. The results are presented in graphical and tabular formats. As the thermal energy of the liquid increases, the thermophoresis values trend upward, while the Nb values show a downward trajectory. Also, we found that the response rate encourages a reduction in the thermal boundary layer's thickness.
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Numerical simulation of unsteady MHD bio-convective flow with Cattaneo-Christov heat flux over a stretching surface
(2025-04-01)
Shalini, Chinnam A.A.E.
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Ganteda, Charankumar
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Reddy, G. V.Ramana
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Maheswari, B. Uma
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Kokila, G.
The study explores the properties of mass and heat transfer in a time-dependent, unsteady magnetohydrodynamic (MHD) flow over a permeable, radiative, and expanded surface, incorporating bio-convection, nanoparticle suspension, and gyrotactic bacteria dynamics. The model considers the effects of emission, speed slip, and bio-thermal convection in the fluid system. The Cattaneo-Christov heat flux model is employed to account for the finite speed of thermal diffusion, and the fourth-order Runge-Kutta method with the shooting technique is utilized for numerical solutions. Additionally, the study investigates the influence of mass suction, heat source, and aligned magnetic field on the boundary layer. The local concentration of mobile microorganisms decreases as the stretching parameter and bio-convection Schmidt both improve. The concentration φ(η) gets stronger, and when Sc values increase, it decreases. The concentration of microorganism h(η) is strengthened by increasing angle β, but it is diminished by increasing Pe,Sb and Sc, respectively.Even if the rate of temperature transmission (Nu) is maximal for positive values of A relative to negative values, the friction drags (C<inf>f</inf>) are more powerful for negative values of A than for positive values of A.
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On Cattaneo-Chrystov heat flux model for nanofluid flow on Darcy–Forchheimer porous medium past unsteady stretching cylinder
(2025-03-01)
Sobhanapuram, Sreedhar
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Devi, S. V.V.Rama
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Ganteda, Charankumar
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Kottapalli, Rajyalakshmi
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Govindan, Vediyappan
In a Darcy-Forchheimer porous medium with variable thermal conductivity, this work describes the convective transport mechanisms of Williamson nanofluid and nanofluid flow via an unstable stretched cylindrical sheet. The governing boundary evaluates issue of the flow regime is formulated utilizing the conservation laws of mass, momentum, energy. A couple of nonlinear partial differential constitutions are used to express the flow. A suitable similarity transformation along with certain approaches are applied to convert the pair of partial differential constitutions into an initial value problem system. In this analysis, the Cattaneo-Chrystov model is introduced. After that, the shooting strategy and the Runge-Kutta fourth order are used to numerically solve the system of initial value problems. Analysis is done on the effects of several factors on the nanofluid's temperature, velocity, and concentration contours. such as the thermal conductivity parameter, the concentration and temperature Biot numbers, the unsteady parameter, and others. Conversely, larger values of the unstable parameter result in significant wall friction that hinders the nanofluid'smobility. Furthermore, under widely accepted assumptions, the numerical approach found here shows great agreement with several previous efforts. An uplifting in the unsteady factor causes the nanofluid's temperature and concentration boundary layers to enlarge. When the corresponding Biot numbers (thermal and concentration) grow, the two boundary layers of the nanofluid expand, initiating the convective mass and heat transfers from the wall to the system. The rates of mass and heat transfers increase and decrease in tandem with increases in the thermal conductivity parameter and thermal Biot number, respectively; however, the transfers exhibit the opposite behavior for higher concentration Biot number values.Compared with the existing research, the outcomes demonstrate excellent congruence.
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Numerical exploration of Hall and Dufour effects on rotating MHD natural convection near an infinite vertical plate with ramped boundary conditions using FDM and RSM using combined FDM and RSM approaches
(2025-03-01)
Mopuri, Obulesu
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Ganteda, Charankumar
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Palegari, Rudraravi Kumar
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Jaya Lalitha, G.
;
Harikrishna, P.
This study investigates the effects of ramped parameters, diffusion thermo effects, radiation and heat absorption, Soret, and Hall effects on rotating MHD free convective flow under simultaneous ramped boundary conditions. The governing equations are transformed into dimensionless form and solved using an explicit finite difference method (FDM), with numerical results for velocity, temperature, concentration, viscous drag, heat, and mass transfer rates analyzed using MATLAB. Results show that increasing ramped parameters enhances momentum, heat, and mass transfer rates, with a novel observation of increased fluid velocity under stronger magnetic constraints. Additionally, the finite response method (FRM) is proposed to optimize parameter interactions, enabling efficient modeling and prediction of outcomes for variations beyond those tested in the FDM. This integration enhances understanding of sensitivities and optimal conditions in fluid behavior under simultaneous ramped constraints.
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Combined viscous dissipation and joule heating effects on chemically radiative MHD micropolar flow with heat source and convective boundary conditions
(2025-02-01)
Konda, Jayaramireddy
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Reddy, M. Narendranadh
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Ganteda, Charankumar
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Kottapalli, Rajyalakshmi
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Adinarayana, Y.
The proposed study presents a comprehensive investigation of the combined effects of viscous dissipation and Joule heating on chemically reactive magnetohydrodynamic (MHD) micropolar fluid flow over a nonlinear stretching sheet, incorporating the influences of radiative heat transfer, heat source, and convective boundary conditions. The current study investigates the flow of a type of fluid called micropolar fluid in a stretched 2D space. This fluid is viscous, and the flow is influenced by convective boundary conditions. Mathematical equations are derived considering factors such as heat, friction, electrical effects, chemical reactions, and radiation heat transfer. The fluid can conduct electricity when exposed to an external magnetic field. The complex partial differential equations governing the boundary layer flow are simplified into ordinary differential equations using a technique known as similarity transformation. The problem is solved using the Runge-Kutta-Fehlberg method with a shooting technique. Graphs are generated to analyze how physical factors influence temperature and concentration profiles. The skin friction coefficient, local Nusselt number, and local Sherwood number are calculated and studied. In this study, we compare our results with those of other research and find good agreement.
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Numerical study on thermal radiation and chemical reaction impacts on Prandtl nanofluid flow over a bilinear stretching sheet with heat generation and absorption: Response surface methodology
(2025-02-01)
Padmavathi, L.
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Kumar, S. Geethan
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Ganteda, Charankumar
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Varma, S. V.K.
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Gouthami, E.
The study focuses on the three-dimensional flow of a non-Newtonian Prandtl nanofluid with electrical conductivity, flowing over a bilinear expanding surface within a porous medium. These flows in porous medium are applied in water purification processes, petroleum industries and also chemical factories. The exploration examines various heat and mass transport phenomena, including the consequences of thermal radiation, thermophoresis, Brownian motion, substance response and heat source/sink. The governing partial differential equations are reformulated into a system of nonlinear ordinary differential equations through the application of appropriate similarity transformations. These equations are subsequently solved by using numerical methods bvp4c as well as shooting method. Furthermore, the arithmetical values for the friction factor and the temperature and accumulation constants are provided in tables. It is experiential that the Prandtl fluid constraint enhances the axial and transverse velocities, while the temperature sharing shows an inverse relationship. The temperature and concentration distributions have an opposite attitude with the influence of Brownian motion parameter.

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