Effects of Variable Viscosity and Thermal Conductivity of Unsteady Micropolar Fluid under Mixed Convection in Presence of Uniform Magnetic Field on Stretching Surface

Abstract

In the paper, an analysis is performed to study the effect of temperature dependent viscosity and thermal conductivity of unsteady viscous incompressible boundary layer micropolar fluid flow under mixed convection. The flow past is to be studied over a stretching sheet in presence of viscous dissipation. In the process of study, partial differential equations governing the flow have been transformed into ordinary differential equations in dimensionless form using similarity transformation and solved numerically by using Runge-Kutta shooting method. The effects of various important parameters of the problem concerned like viscosity, thermal conductivity, micro-rotation, unsteadyness of the fluid on velocity and temperature within the boundary layers are obtained. The results are represented graphically. The skin friction, Nusselt numbers are also computed, analysed and given in tabular form.

Behaviour of Soret and Dufour Effects on Unsteady Micropolar Fluid Considering Viscosity and Thermal Conductivity as Variable Quantities under Mixed Convection and Mass Transfer

“…Final boundary value equations (11) to 14 fg  also given in the same tables. The Table:I (one) reflects that increasing value of thermal conductivity and Prandtls number give increase of both the coefficient of Skin friction and the Nusselt number.…”

“…Oianrewaju [15], Hazarika and Phukan [10] and also many researchers studied the behaviour of micropolar fluids in steady state on different environments. Hayat [18], El Aziz [14],], Thakur et al [16 ] , Baruah and Hazarika [11] studied Micropolar fluids in the unsteady state. The study of unsteady flow over stretching surface has its own importance as it is not possible to maintain steady-state conditions in the velocity and thermal fields due to impulsive change in the surface velocity or temperature (heat flux).…”

Exploration of radiative heat energy on KKL model micropolar nanofluid past a permeable moving surface

“…The tiny size nanoparticles are useful to carry the slip velocity within the partcles of conventional fluids [9]. Various researchers have shown that particle rotation is also vital for the enhancement of heat transfer coefficient [10][11][12][13]. Due to the slip velocity of nanoparticles with the base fluid molecules, there is a possibility of microrotation in addition to the translation.…”