Heat Transfer Of Micropolar Fluid Research Articles

Heat transfer in micropolar fluid along an inclined permeable plate with variable fluid properties

This paper studies the heat transfer process in a two-dimensional steady hydromagnetic natural convective flow of a micropolar fluid over an inclined permeable plate subjected to a constant heat flux condition. The analysis accounts for both temperature dependent viscosity and temperature dependent thermal conductivity. The local similarity equations are derived and solved numerically using the Nachtsheim–Swigert iteration procedure. Results for the dimensionless velocity and temperature profiles and the local rate of heat transfer are displayed graphically delineating the effect of various parameters characterizing the flow. The results show that in modeling the thermal boundary layer flow when both the viscosity and thermal conductivity are temperature dependent, the Prandtl number must be treated as a variable to obtain realistic results. As the thermal conductivity parameter increases, it promotes higher velocities and higher temperatures in the respective boundary layers. The wall shear stress increases with the increase of thermal conductivity parameter. This is true of electrically conducting as well as electrically non-conducting fluids. The presence of heat generation invigorates the flow and produces larger values of the local Nusselt number compared with the case of zero heat generation.

Numerical solution of micropolar fluid flow and heat transfer between two co-axial porous circular cylinders

Classical Couette-Poiseuille shear flow and heat transfer in micropolar fluid between two co-axial porous circular cylinders under a constant pressure gradient when the outer cylinder moves parallel to itself with a uniform velocity, has been examined. The governing equations of momentum and first stress momentum are solved using Newton-Raphson method while the energy equation is solved using sweeping method. The velocity, microrotation and temperature distribution are displayed graphically. As compared to the Newtonian fluid, it is observed that for a positive pressure gradient the velocity and temperature both increase throughout the gap when the fluid is made more and more micropolar. The skin friction, couple stress and dimensionless rate of heat transfer on the walls are shown in tables.

Numerical solution of combined convective heat transfer of micropolar fluid in an annulus of two vertical pipes

The problem of free and forced convective heat transfer of micropolar fluid in an annulus of two vertical pipes has been studied by applying Runge—Kutta—Merson method. It has been found that, when the temperature of the pipes decreases with height, the presence of micropolar elements delay the onset of instability. On the other hand, when the temperature increases with height it has been noticed that microrotation enhances the back flow. Effect of micropolar parameters and Rayleigh number on heat transfer are also discussed in detail.