Rama Subba Reddy Gorla

Free convection on a vertical stretching surface with suction and blowing

The natural convective heat transfer from a vertical stretching sheet with surface mass transfer is analyzed. A three dimensional similarity solution to the governing momentum and energy equations is presented. Numerical data for the friction factor and Nusselt number has been tabulated for a range of surface mass transfer rates and Prandtl numbers. Surface mass transfer has a considerable influence on the heat transfer mechanism.

The effect of variable viscosity on flow and heat transfer to a continuous moving flat plate

Abstract The influence of variable viscosity on laminar boundary layer flow and heat transfer due to a continuously moving flat plate is examined. The fluid viscosity is assumed to vary as an inverse linear function of temperature. By means of the similarity solutions and deviation of the velocity and temperature fields as well as of the skin friction and heat transfer results from their constant values are determined.

Flow and heat transfer in a power-law fluid over a nonisothermal stretching sheet

A boundary layer analysis has been presented for the problem of flow and heat transfer from a power-law fluid to a continuous stretching sheet with variable wall temperature. A similarity transformation is applied to reduce the Navier-Stokes and energy equations, and the resulting system of nonlinear ordinary differential equations is solved using the expansion of Chebyshev polynomials. Parametric studies are performed to investigate the effects of non-Newtonian flow index, generalized Prandtl number, power-law surface temperature and surface mass transfer rate. The friction factor and heat transfer rate results exhibit strong dependence on the fluid parameters.

Short communication radiation effects on MHD free convection flow of a gas past a semi—infinite vertical plate

Free convection heat transfer due to the simultaneous action of buoyancy, radiation and transverse magnetic field is investigated for a semi‐infinite vertical plate. Solutions are derived by expanding the stream function and the temperature into a series in terms of the parameter ζ = x1/2 L–1/2, where L is the length of the plate. Velocity and temperature functions are shown on graphs and the numerical values of functions affecting the shear stress and the rate of heat transfer are entered in a table. The effects of the magnetic field parameter λ and the radiation parameter F on these functions are discussed.

Mixed convective boundary layer flow over a vertical wedge embedded in a porous medium saturated with a nanofluid: Natural Convection Dominated Regime

A boundary layer analysis is presented for the mixed convection past a vertical wedge in a porous medium saturated with a nano fluid. The governing partial differential equations are transformed into a set of non-similar equations and solved numerically by an efficient, implicit, iterative, finite-difference method. A parametric study illustrating the influence of various physical parameters is performed. Numerical results for the velocity, temperature, and nanoparticles volume fraction profiles, as well as the friction factor, surface heat and mass transfer rates have been presented for parametric variations of the buoyancy ratio parameter Nr, Brownian motion parameter Nb, thermophoresis parameter Nt, and Lewis number Le. The dependency of the friction factor, surface heat transfer rate (Nusselt number), and mass transfer rate (Sherwood number) on these parameters has been discussed.

Heat transfer to a micropolar fluid from a non-isothermal stretching sheet with suction and blowing

SummaryThe heat transfer from a stretching sheet to a micropolar fluid is analyzed using the theory of micropolar fluids formulated by Eringen. The governing equations for momentum, angular momentum and energy have been solved numerically. Numerical data for the friction factor and Nusselt number has been tabulated for a range of Prandtl numbers. Surface mass transfer rate and the power law constant for the wall temperature have considerable influence on the heat transfer mechanism.

Free convection from a vertical plate with nonuniform surface heat flux and embedded in a porous medium

An analysis is presented for the calculation of heat transfer due to free convective flow along a vertical plate embedded in a porous medium with an arbitrarily varying surface heat flux. By applying the appropriate coordinate transformations and the Merk series, the governing energy equation is expressed as a set of ordinary differential equations. Numerical solutions are presented for these equations which represent universal functions and several computational examples are provided.

Heat transfer in micropolar boundary layer flow over a flat plate

Abstract Boundary layer solutions are presented to study the steady state heat transfer from a semi-infinite flat plate to a micropolar fluid. The boundary conditions of isothermal wall, constant surface heat flux and insulated wall with viscous dissipation effects have been treated in this paper. Numerical results for the temperature distribution and the missing wall values of the thermal functions have been given. The range of Prandtl numbers investigated was from 10 to 1000 while the dimensionless grouping of the material properties was allowed to vary over a wide range.

Combined forced and free convection in micropolar boundary layer flow on a vertical flat plate

Abstract Boundary layer solutions are presented to study the combined forced and free convection from a vertical semi-infinite plate to a micropolar fluid. The boundary conditions of isothermal wall and constant surface heat flux are considered. Numerical results are obtained for the velocity and temperature distribution and the missing wall values of the velocity and thermal functions. Micropolar fluids display drag reduction and reduced surface heat transfer rate when compared to Newtonian fluids.

Heat transfer in an axisymmetric stagnation flow on a cylinder

An analysis is presented for the steady state heat transfer in an axisymmetric stagnation flow on an infinite circular cylinder. Boundary layer solutions are given for constant wall temperature and constant wall heat flux boundary conditions. Numerical results for the temperature distribution and solutions for the wall values of the temperature function have been tabulated. The range of Prandtl numbers considered was from 0.01 to 1000 while the Reynolds number was varied from 0.01 to 100.