Thermal convection of viscoelastic fluid with Biot boundary conduction

Abstract

Two-dimensional unsteady natural convection of a non-linear fluid represented by Criminale-Erickson-Filbey (CEF) fluid model in a square cavity is studied in the fluid for Rayleigh-Benard convection case. The governing vorticity and energy transport equations are solved numerically either simple explicit and ADI methods, respectively. The two-dimensional convective motion is generated by buoyancy forces on the fluid in a square cavity, when the vertical walls are either perfectly insulated or conducted with Plot boundary conduction condition. The contributions of the elastic and shear dependent characteristics of the liquid to the non-Newtonian behaviour are investigated on the temperature distribution and heat transfer. The effect of the Weissenberg (which is a measure of the elasticity of the fluid), Rayleigh and Plot numbers on the temperature and streamline profiles are delineated and this has been documented first time for the viscoelastic fluid. (C) 2001 IMACS. Published by Elsevier Science B.V. All rights reserved.