The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
R Ellahi - One of the best experts on this subject based on the ideXlab platform.
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the effects of mhd and temperature dependent viscosity on the flow of non newtonian nanofluid in a pipe analytical solutions
Applied Mathematical Modelling, 2013Co-Authors: R EllahiAbstract:Abstract This article examines the magnetohydrodynamic (MHD) flow of non-Newtonian nanofluid in a pipe. The temperature of the pipe is assumed to be higher than the temperature of the fluid. In particular two temperature dependent viscosity models, have been considered. The nonlinear partial differential equations along with the boundary conditions are first cast into a Dimensionless Form and then the equations are solved by homotopy analysis method (HAM). Explicit analytical expressions for the velocity field, the temperature distribution and nano concentration have been derived analytically. The effects of various physical parameters on velocity, temperature and nano concentration are discussed by using graphical approach.
Hiranmoy Mondal - One of the best experts on this subject based on the ideXlab platform.
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influence of thermophoresis and soret dufour on magnetohydrodynamic heat and mass transfer over a non isothermal wedge with thermal radiation and ohmic dissipation
Journal of Magnetism and Magnetic Materials, 2013Co-Authors: Dulal Pal, Hiranmoy MondalAbstract:Abstract The present paper deals with the thermophoresis particle deposition and Soret–Dufour effects on the convective flow, heat and mass transfer characteristics of an incompressible Newtonian electrically conducting fluid having temperature-dependent viscosity over a non-isothermal wedge in the presence of thermal radiation. The governing boundary layer equations are written into a Dimensionless Form by similarity transFormations. The transFormed coupled non-linear ordinary differential equations are solved numerically. The effects of various important physical parameters are analyzed in detail. It is found that the skin friction coefficient and the local Sherwood number increase with increase in the values of thermal radiation parameter in the presence of heat generation/absorption whereas reverse effect is seen on the local Nusselt number.
Basant K. Jha - One of the best experts on this subject based on the ideXlab platform.
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Unsteady hydromagnetic-free convection flow with suction/injection
Taylor & Francis Group, 2019Co-Authors: Basant K. Jha, Luqman A. Azeez, Michael O. OniAbstract:This article analyses the unsteady hydromagnetic free convection flow near impulsive as well as accelerated motion of the infinite vertical porous plate. The governing momentum and energy partial differential equations exhibiting the physics of the flow Formation are presented. Using suitable Dimensionless parameters, the equations are transFormed to their corresponding Dimensionless Form and solved exactly in the Laplace domain using the well-known Laplace transForm technique. However, the Riemann-sum approximation method is used to invert the solution from the Laplace domain to time domain due of the complexity of the solutions obtained in the Laplace domain. The effect of various pertinent parameters such as suction/injection, Hartmann number, Grashof number, and Prandtl number is discussed with the aid of line graphs
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mixed convection flow in a vertical tube filled with porous material with time periodic boundary condition steady periodic regime
Afrika Matematika, 2015Co-Authors: Basant K. Jha, Abiodun O Ajibade, Deborah DaramolaAbstract:An analytical study is reported on the hydrodynamic and thermal behaviour of a fully developed mixed convective flow in a vertical tube filled with isotropic porous material having time-periodic boundary condition. The analysis is perFormed for fully developed parallel flow and steady-periodic regime. The momentum and energy equations presented in Dimensionless Form along with the constraint equations for the present physical situation are solved exactly. Closed Form solution are expressed in terms of modified Bessel function of first kind. The solution obtained is graphically represented and the effect of the Prandtl number \(Pr\), the Dimensionless frequency \(\Omega \), and the Darcy number \(Da\) on the flow is investigated. It is discovered that velocity is maximum at two different locations in the flow domain, one near the surface of the tube and another at the axis of the tube.
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free convective flow of heat generating absorbing fluid between vertical porous plates with periodic heat input
International Communications in Heat and Mass Transfer, 2009Co-Authors: Basant K. Jha, Abiodun O AjibadeAbstract:Abstract This study investigates the free convective flow of heat generating/absorbing fluid between vertical parallel porous plates due to periodic heating of the porous plates. The analysis is perFormed by considering fully developed flow and steady-periodic regime. The momentum and energy equations, which arise from the definition of velocity and temperature, are written in Dimensionless Form. Separating the temperature and velocity fields into steady and periodic parts, the resulting second order differential equations are solved to obtain the expressions for velocity, temperature, skin friction and the rate of heat transfer. The effects of various flow parameters such as the suction/injection ( s ), heat source/sink ( δ ), Strouhal ( St ) and Prandtl ( Pr ) numbers on the skin friction coefficient, rate of heat transfer, velocity and temperature profiles are discussed with the aid of line graphs and contour maps.
Dulal Pal - One of the best experts on this subject based on the ideXlab platform.
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influence of thermophoresis and soret dufour on magnetohydrodynamic heat and mass transfer over a non isothermal wedge with thermal radiation and ohmic dissipation
Journal of Magnetism and Magnetic Materials, 2013Co-Authors: Dulal Pal, Hiranmoy MondalAbstract:Abstract The present paper deals with the thermophoresis particle deposition and Soret–Dufour effects on the convective flow, heat and mass transfer characteristics of an incompressible Newtonian electrically conducting fluid having temperature-dependent viscosity over a non-isothermal wedge in the presence of thermal radiation. The governing boundary layer equations are written into a Dimensionless Form by similarity transFormations. The transFormed coupled non-linear ordinary differential equations are solved numerically. The effects of various important physical parameters are analyzed in detail. It is found that the skin friction coefficient and the local Sherwood number increase with increase in the values of thermal radiation parameter in the presence of heat generation/absorption whereas reverse effect is seen on the local Nusselt number.
K N Rai - One of the best experts on this subject based on the ideXlab platform.
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modelling and simulation of a moving boundary problem arising during immersion frying of foods
National Academy Science Letters-india, 2019Co-Authors: Subrahamanyam Upadhyay, Sarita Yadav, K N RaiAbstract:A single phase lagging model of heat and moisture transfer has been developed in an infinite slab undergoing immersion frying of foods. This model is a moving boundary problem of a system of second order hyperbolic partial differential equations. The solution obtained by using finite element Legendre wavelet Galerkin scheme. The stability analysis of present model and method are discussed in detailed and whole analysis presented in Dimensionless Form. The effect of variability of Luikov number, Kossovich number and Biot number on frying process are discussed in detail.
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analytical solution of fourier and non fourier heat transfer in longitudinal fin with internal heat generation and periodic boundary condition
International Journal of Thermal Sciences, 2018Co-Authors: Surjan Singh, Dinesh Kumar, K N RaiAbstract:Abstract In this paper, the analytical solution of Fourier and non-Fourier model of heat transfer in longitudinal fin in presence of internal heat generation has been studied under periodic boundary condition. The whole analysis is given in Dimensionless Form. These two mathematical models have been solved analytically, using Laplace transForm technique. Temperature distribution in longitudinal fin is measured using residual theorem in complex plane for the inverse Laplace transForm technique. Thermal wave nature is appeared for small value of F o . The longitudinal fin temperature is evaluated for different value of parameters with respect to space coordinate. The effect of variability of different parameters on temperature distribution in fin is studied in detailed. It has been observed that the cooling process is faster in non-Fourier model in comparison to Fourier model.
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wavelet collocation solution of non linear fin problem with temperature dependent thermal conductivity and heat transfer coefficient
International Journal of Nonlinear Analysis and Applications, 2015Co-Authors: Surjan Singh, Dinesh Kumar, K N RaiAbstract:In this paper, Wavelet Collocation Method has been used to solve nonlinear n problem with temperature dependent thermal conductivity and heat transfer coecient. Thermal conductivity of n materials varies any type so that we consider thermal conductivity as the general function of temperature. Here we consider three particular cases, where we assume that thermal conductivity is constant, linear and exponential function of temperature. In each case eciency of n is evaluated. The whole analysis is presented in Dimensionless Form and the eect of variability of n parameter, exponent and thermal conductivity parameter on temperature distribution and n eciency is shown graphically and discussed in detail.