Dr K venkatadri - Academia.edu (original) (raw)
Papers by Dr K venkatadri
Canadian journal of chemical engineering/The Canadian journal of chemical engineering, May 8, 2024
Numerical Heat Transfer, Part A: Applications
Qatar University, Mar 31, 2021
Ti t l e C F D a n aly sis of s m a r t s e mi c o n d u c t o r el e c t r o-c o n d u c tiv e M... more Ti t l e C F D a n aly sis of s m a r t s e mi c o n d u c t o r el e c t r o-c o n d u c tiv e M a r a n g o ni m el t c avity flow
Journal of Taibah University for Science
Nanoscience and Technology: An International Journal, 2021
Geoenergy Science and Engineering
Waves in Random and Complex Media, Dec 20, 2022
Lecture Notes in Mechanical Engineering, 2017
The article presents a numerical study performed on analysis of unsteady magneto-convective heat ... more The article presents a numerical study performed on analysis of unsteady magneto-convective heat transfer in a square enclosure with partial active wall. The thermally insulated top and bottom wall while the left vertical wall is heated at Centre the rest of the left vertical wall is adiabatic and right vertical wall maintained at a lower temperature T c. MAC (Marker-and-Cell) method is used to solve numerically set of dimensionless governing partial differential equations. The effect of local heat source on left wall is evaluated. The influence of the governing of thermophysical parameters, namely Prandtl number, Rayleigh number \(\left( {Ra} \right)\), Hartmann number \(\left( {Ha} \right)\), Grashof number \(\left( {Gr} \right)\) and Reynolds number \(\left( {Re} \right)\), is obtained. The results of streamlines and temperature are presented graphically and discussed.
The European Physical Journal Special Topics
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018
In thermo-fluid dynamics, free convection flows external to different geometries such as cylinder... more In thermo-fluid dynamics, free convection flows external to different geometries such as cylinders, ellipses, spheres, curved walls, wavy plates, cones etc. play major role in various industrial and process engineering systems. The thermal buoyancy force associated with natural convection flows can exert a critical role in determining skin friction and heat transfer rates at the boundary. In thermal engineering, natural convection flows from cones has gained exceptional interest. A theoretical analysis is developed to investigate the nonlinear, steady-state, laminar, non-isothermal convection boundary layer flows of viscoelastic fluid from a vertical permeable cone with a power-law variation in both temperature and concentration. The Jeffery's viscoelastic model simulates the non-Newtonian characteristics of polymers, which constitutes the novelty of the present work. The transformed conservation equations for linear momentum, energy and concentration are solved numerically under physically viable boundary conditions using the finitedifferences Keller-Box scheme. The impact of Deborah number (De), ratio of relaxation to retardation time (), surface suction/injection parameter (fw), power-law exponent (n), buoyancy ratio parameter (N) and dimensionless tangential coordinate () on velocity, surface temperature, concentration, local skin friction, heat transfer rate and mass transfer rate in the boundary layer regime are presented graphically. It is observed that increasing values of De reduces velocity whereas the temperature and concentration are increased slightly. Increasing enhance velocity however reduces temperature and concentration slightly. The heat and mass transfer rate are found to decrease with increasing De and increase with increasing values of . The skin friction is found to decrease with a rise in De whereas it is elevated with increasing values of . Increasing values of fw and n, decelerates the flow and also cools the boundary layer i.e. reduces temperature and also concentration. The study is relevant to chemical engineering systems, solvent and polymeric processes.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2022
A theoretical and computational study of MHD natural convection in an isotropic non-Darcian porou... more A theoretical and computational study of MHD natural convection in an isotropic non-Darcian porous medium saturated with electrically conducting helium gas in an enclosure in the presence of heat generation is presented. A Brinkman extended Darcy-Forchheimer model is employed and the working fluid is assumed to be incompressible. The model is non-dimensionalised and converted into pressure-velocity form. The Harlow-Welch marker and cell (MAC) finite difference technique is employed to solve the nonlinear boundary value problem via pressure-vorticity coupling. A parametric investigation of the influence of Grashof number ( Gr), Hartmann magnetic number ( Ha), Darcy number ( Da), and the internal heat generation parameter ( Γ) on streamline and isotherm distributions with Prandtl number ( Pr) is 0.71 (Helium) is conducted. The variation in local Nusselt number along the left and right walls of the computational 2 D enclosure is also studied. Validation house-computational numerical MA...
Advances in Fluid Dynamics
The non-similar natural convection flows of an incompressible viscoelastic fluid past an isotherm... more The non-similar natural convection flows of an incompressible viscoelastic fluid past an isothermal cone with BIOT number effects and variable temperature are investigated. The Keller-Box technique is utilized to solve the transformed conservation equations subject to physically appropriate boundary conditions. The variations of different emerging dimensionless parameters on velocity, temperature, skin friction coefficient and heat transfer rate profiles are presented.
The Non-Newtonian fluids in porous medium are widely deployed in energy systems. Motivated by the... more The Non-Newtonian fluids in porous medium are widely deployed in energy systems. Motivated by these developments, in the current study, a numerical simulation is performed on two-dimensional, buoyancy-driven flow in a porous square cavity filled with non-Newtonian fluid (Casson liquid). The enclosure geometry features vertical isothermal walls (with one at higher temperature than the other) and thermally insulated horizontal walls. The conservation of mass, momentum and energy equations are normalized via appropriate transformations and the resulting dimensionless boundary value problem is solved by the effective technique named as projection method (Marker and Cell (MAC) algorithm) along with a staggered grid system. Extensive visualizations of the impact of emerging physical fluid flow parameters (Rayleigh number Ra Darcy number Da, thermal radiation Rd and Cassonviscoplastic parameter ) on streamline and isotherm distributions in the porous enclosure are presented for fixed Pran...
Applied and Computational Mechanics, 2020
The roll of melting heat transfer on magnetohydrodynamic natural convection in a square enclosure... more The roll of melting heat transfer on magnetohydrodynamic natural convection in a square enclosure with heating of bottom wall is examined numerically in this article. The dimensionless governing partial differential equations are transformed into vorticity and stream function formulation and then solved using the finite difference method (FDM). The effects of thermal Rayleigh number (Ra), melting parameter (M) and Hartmann number (Ha) are graphically illustrated. As melting parameter and Rayleigh number increase, the rate of fluid flow and temperature gradients also increase. And in the presence of magnetic field, the temperature gradient reduces and hence, the conduction mechanism is dominated for larger Ha. Greater heat transfer rate is observed in the case of uniform heating compared with non-uniform case. The average Nusselt number reduces with increasing magnetic parameter in the both cases of heating of bottom wall.
A numerical simulation is performed on transport phenomena in a square cavity with the Lewis numb... more A numerical simulation is performed on transport phenomena in a square cavity with the Lewis number influence. The enclosure filled with water-based nanofluid and the square cavity enclosed by thermal walls with various thermal conditions, vertical walls of the cavity having different temperatures comparatively one is higher than the other. The effective tool for implemented to eliminate the pressure term, named as vorticity—stream function formulation. The nonlinear coupled governing partial differential equations are employed with finite difference method along with central difference approximation. The visualization of fluid flow, temperature distribution and nanoparticles distribution is depicted in the form of streamlines, isotherms and isoconcentration with the influence of various governing parameters.
Natural convection of triangular enclosure filled with water-based nanofluid under the influence ... more Natural convection of triangular enclosure filled with water-based nanofluid under the influence of Brownian diffusion and thermophoresis is studied numerically in two cases by depending on wall boundary conditions. The high (hot) temperature vertical wall and the insulated bottom wall are considered in case (i) and the other case the bottom wall is uniformly heated while the vertical wall is thermally insulated. In both cases, the inclined wall is maintained low temperature (i.e., cold inclined wall). The coupled governing vorticity–stream function formulation equations are employed by the help of finite difference method (FDM). The influence of the Rayleigh number, Lewis number on fluid flow, heat have been examined through graphically and discussed. It has been found that in the case of uniform heating is high sensitive to rising of the Ra, while the uniform heating of the left wall of the cavity is not so sensitive to changes of Ra.
Applied and Computational Mechanics, 2020
The augment of heat transfer and fluid of buoyancy-driven flow of Fe3O4-Water nanofluid in a squa... more The augment of heat transfer and fluid of buoyancy-driven flow of Fe3O4-Water nanofluid in a square cavity under the influence of an external magnetic field is studied numerically. Cold temperature is applied on the side (vertical) walls and high temperature is imposed on the bottom wall while the top wall is kept at thermally insulated. The governing non-dimensional differential equations are solved using Marker and Cell (MAC) Algorithm. The developed MATLAB code is validated with previous literature and it gives good agreement. The effects of Rayleigh number Ra, Prandtl number Pr and Hartmann number Ha on the flow and heat transfer characteristics are analyzed. Results indicate that the temperature gradient is an increasing function of the buoyancy force. The heat transfer characteristics and flow behavior are presented in the form of streamlines and isotherms. The position of magnetic wire is played a vital role in controlling of heat transfer rate.
In thermosfluid dynamics, free convection flows external to different geometries, such as cylinde... more In thermosfluid dynamics, free convection flows external to different geometries, such as cylinders, ellipses, spheres, curved walls, wavy plates, cones, etc., play major role in various industrial and process engineering systems. The thermal buoyancy force associated with natural convection flows can play a critical role in determining skin friction and heat transfer rates at the boundary. In thermal engineering, natural convection flows from cylindrical bodies has gained exceptional interest. In this article, we mathematically evaluate an entropy analysis of magnetohydrodynamic third-grade convection flows from permeable cylinder considering velocity and thermal slip effects. The resulting non-linear coupled partial differential conservation equations with associated boundary conditions are solved with an efficient unconditionally stable implicit finite difference Keller-Box technique. The impacts of momentum and heat transport coefficients, entropy generation and Bejan number are...
Canadian journal of chemical engineering/The Canadian journal of chemical engineering, May 8, 2024
Numerical Heat Transfer, Part A: Applications
Qatar University, Mar 31, 2021
Ti t l e C F D a n aly sis of s m a r t s e mi c o n d u c t o r el e c t r o-c o n d u c tiv e M... more Ti t l e C F D a n aly sis of s m a r t s e mi c o n d u c t o r el e c t r o-c o n d u c tiv e M a r a n g o ni m el t c avity flow
Journal of Taibah University for Science
Nanoscience and Technology: An International Journal, 2021
Geoenergy Science and Engineering
Waves in Random and Complex Media, Dec 20, 2022
Lecture Notes in Mechanical Engineering, 2017
The article presents a numerical study performed on analysis of unsteady magneto-convective heat ... more The article presents a numerical study performed on analysis of unsteady magneto-convective heat transfer in a square enclosure with partial active wall. The thermally insulated top and bottom wall while the left vertical wall is heated at Centre the rest of the left vertical wall is adiabatic and right vertical wall maintained at a lower temperature T c. MAC (Marker-and-Cell) method is used to solve numerically set of dimensionless governing partial differential equations. The effect of local heat source on left wall is evaluated. The influence of the governing of thermophysical parameters, namely Prandtl number, Rayleigh number \(\left( {Ra} \right)\), Hartmann number \(\left( {Ha} \right)\), Grashof number \(\left( {Gr} \right)\) and Reynolds number \(\left( {Re} \right)\), is obtained. The results of streamlines and temperature are presented graphically and discussed.
The European Physical Journal Special Topics
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018
In thermo-fluid dynamics, free convection flows external to different geometries such as cylinder... more In thermo-fluid dynamics, free convection flows external to different geometries such as cylinders, ellipses, spheres, curved walls, wavy plates, cones etc. play major role in various industrial and process engineering systems. The thermal buoyancy force associated with natural convection flows can exert a critical role in determining skin friction and heat transfer rates at the boundary. In thermal engineering, natural convection flows from cones has gained exceptional interest. A theoretical analysis is developed to investigate the nonlinear, steady-state, laminar, non-isothermal convection boundary layer flows of viscoelastic fluid from a vertical permeable cone with a power-law variation in both temperature and concentration. The Jeffery's viscoelastic model simulates the non-Newtonian characteristics of polymers, which constitutes the novelty of the present work. The transformed conservation equations for linear momentum, energy and concentration are solved numerically under physically viable boundary conditions using the finitedifferences Keller-Box scheme. The impact of Deborah number (De), ratio of relaxation to retardation time (), surface suction/injection parameter (fw), power-law exponent (n), buoyancy ratio parameter (N) and dimensionless tangential coordinate () on velocity, surface temperature, concentration, local skin friction, heat transfer rate and mass transfer rate in the boundary layer regime are presented graphically. It is observed that increasing values of De reduces velocity whereas the temperature and concentration are increased slightly. Increasing enhance velocity however reduces temperature and concentration slightly. The heat and mass transfer rate are found to decrease with increasing De and increase with increasing values of . The skin friction is found to decrease with a rise in De whereas it is elevated with increasing values of . Increasing values of fw and n, decelerates the flow and also cools the boundary layer i.e. reduces temperature and also concentration. The study is relevant to chemical engineering systems, solvent and polymeric processes.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2022
A theoretical and computational study of MHD natural convection in an isotropic non-Darcian porou... more A theoretical and computational study of MHD natural convection in an isotropic non-Darcian porous medium saturated with electrically conducting helium gas in an enclosure in the presence of heat generation is presented. A Brinkman extended Darcy-Forchheimer model is employed and the working fluid is assumed to be incompressible. The model is non-dimensionalised and converted into pressure-velocity form. The Harlow-Welch marker and cell (MAC) finite difference technique is employed to solve the nonlinear boundary value problem via pressure-vorticity coupling. A parametric investigation of the influence of Grashof number ( Gr), Hartmann magnetic number ( Ha), Darcy number ( Da), and the internal heat generation parameter ( Γ) on streamline and isotherm distributions with Prandtl number ( Pr) is 0.71 (Helium) is conducted. The variation in local Nusselt number along the left and right walls of the computational 2 D enclosure is also studied. Validation house-computational numerical MA...
Advances in Fluid Dynamics
The non-similar natural convection flows of an incompressible viscoelastic fluid past an isotherm... more The non-similar natural convection flows of an incompressible viscoelastic fluid past an isothermal cone with BIOT number effects and variable temperature are investigated. The Keller-Box technique is utilized to solve the transformed conservation equations subject to physically appropriate boundary conditions. The variations of different emerging dimensionless parameters on velocity, temperature, skin friction coefficient and heat transfer rate profiles are presented.
The Non-Newtonian fluids in porous medium are widely deployed in energy systems. Motivated by the... more The Non-Newtonian fluids in porous medium are widely deployed in energy systems. Motivated by these developments, in the current study, a numerical simulation is performed on two-dimensional, buoyancy-driven flow in a porous square cavity filled with non-Newtonian fluid (Casson liquid). The enclosure geometry features vertical isothermal walls (with one at higher temperature than the other) and thermally insulated horizontal walls. The conservation of mass, momentum and energy equations are normalized via appropriate transformations and the resulting dimensionless boundary value problem is solved by the effective technique named as projection method (Marker and Cell (MAC) algorithm) along with a staggered grid system. Extensive visualizations of the impact of emerging physical fluid flow parameters (Rayleigh number Ra Darcy number Da, thermal radiation Rd and Cassonviscoplastic parameter ) on streamline and isotherm distributions in the porous enclosure are presented for fixed Pran...
Applied and Computational Mechanics, 2020
The roll of melting heat transfer on magnetohydrodynamic natural convection in a square enclosure... more The roll of melting heat transfer on magnetohydrodynamic natural convection in a square enclosure with heating of bottom wall is examined numerically in this article. The dimensionless governing partial differential equations are transformed into vorticity and stream function formulation and then solved using the finite difference method (FDM). The effects of thermal Rayleigh number (Ra), melting parameter (M) and Hartmann number (Ha) are graphically illustrated. As melting parameter and Rayleigh number increase, the rate of fluid flow and temperature gradients also increase. And in the presence of magnetic field, the temperature gradient reduces and hence, the conduction mechanism is dominated for larger Ha. Greater heat transfer rate is observed in the case of uniform heating compared with non-uniform case. The average Nusselt number reduces with increasing magnetic parameter in the both cases of heating of bottom wall.
A numerical simulation is performed on transport phenomena in a square cavity with the Lewis numb... more A numerical simulation is performed on transport phenomena in a square cavity with the Lewis number influence. The enclosure filled with water-based nanofluid and the square cavity enclosed by thermal walls with various thermal conditions, vertical walls of the cavity having different temperatures comparatively one is higher than the other. The effective tool for implemented to eliminate the pressure term, named as vorticity—stream function formulation. The nonlinear coupled governing partial differential equations are employed with finite difference method along with central difference approximation. The visualization of fluid flow, temperature distribution and nanoparticles distribution is depicted in the form of streamlines, isotherms and isoconcentration with the influence of various governing parameters.
Natural convection of triangular enclosure filled with water-based nanofluid under the influence ... more Natural convection of triangular enclosure filled with water-based nanofluid under the influence of Brownian diffusion and thermophoresis is studied numerically in two cases by depending on wall boundary conditions. The high (hot) temperature vertical wall and the insulated bottom wall are considered in case (i) and the other case the bottom wall is uniformly heated while the vertical wall is thermally insulated. In both cases, the inclined wall is maintained low temperature (i.e., cold inclined wall). The coupled governing vorticity–stream function formulation equations are employed by the help of finite difference method (FDM). The influence of the Rayleigh number, Lewis number on fluid flow, heat have been examined through graphically and discussed. It has been found that in the case of uniform heating is high sensitive to rising of the Ra, while the uniform heating of the left wall of the cavity is not so sensitive to changes of Ra.
Applied and Computational Mechanics, 2020
The augment of heat transfer and fluid of buoyancy-driven flow of Fe3O4-Water nanofluid in a squa... more The augment of heat transfer and fluid of buoyancy-driven flow of Fe3O4-Water nanofluid in a square cavity under the influence of an external magnetic field is studied numerically. Cold temperature is applied on the side (vertical) walls and high temperature is imposed on the bottom wall while the top wall is kept at thermally insulated. The governing non-dimensional differential equations are solved using Marker and Cell (MAC) Algorithm. The developed MATLAB code is validated with previous literature and it gives good agreement. The effects of Rayleigh number Ra, Prandtl number Pr and Hartmann number Ha on the flow and heat transfer characteristics are analyzed. Results indicate that the temperature gradient is an increasing function of the buoyancy force. The heat transfer characteristics and flow behavior are presented in the form of streamlines and isotherms. The position of magnetic wire is played a vital role in controlling of heat transfer rate.
In thermosfluid dynamics, free convection flows external to different geometries, such as cylinde... more In thermosfluid dynamics, free convection flows external to different geometries, such as cylinders, ellipses, spheres, curved walls, wavy plates, cones, etc., play major role in various industrial and process engineering systems. The thermal buoyancy force associated with natural convection flows can play a critical role in determining skin friction and heat transfer rates at the boundary. In thermal engineering, natural convection flows from cylindrical bodies has gained exceptional interest. In this article, we mathematically evaluate an entropy analysis of magnetohydrodynamic third-grade convection flows from permeable cylinder considering velocity and thermal slip effects. The resulting non-linear coupled partial differential conservation equations with associated boundary conditions are solved with an efficient unconditionally stable implicit finite difference Keller-Box technique. The impacts of momentum and heat transport coefficients, entropy generation and Bejan number are...