Transient Mixed Convection Flow of A Second-Grade Visco-Elastic Fluid over a Vertical Surface

• Main Authors: R. A. Damseh, A. S. Shatnawi, A. J. Chamkha, H. M. Duwairi
• Format: Article
• Language: English
• Published: Vilnius University Press 2008-04-01
• Series: Nonlinear Analysis
• Subjects: viscoelastic fluids; transient; mixed convection
• Online Access: http://www.journals.vu.lt/nonlinear-analysis/article/view/14577

The viscoelastic boundary layer flow and mixed convection heat transfer near a vertical isothermal surface have been examined in this paper. The governing equations are formulated and solved numerically using an explicit finite difference technique. The velocity and temperature profiles, boundary layer thicknesses, Nusselt numbers and the local skin friction coefficients are shown graphically for different values of the viscoelsatic parameter. In general, it is found that the velocity decreases inside the boundary layer as the viscoelsatic parameter is increased and consequently, the local Nusselt number decreases. This is due to higher tensile stresses between viscoelsatic fluid layers which has a retardation effects on the motion of these layers and consequently, on the heat transfer rates for the mixed convection heat transfer problem under investigation. A Comparison with available published results on special cases of the problem shows excellent agreement.