Effect of variable viscosity and thermal conductivity on heat transfer in a circular porous passage with axial conduction

Abstract

AbstractIn this study, heat transfer in a circular porous passage with axial conduction and variable viscosity and thermal conductivity numerically has been investigated. Heat transfer for the different values of Da and Pe is investigated. The results found show that Nusselt distribution with variable viscosity does not significantly differ from that with constant viscosity in both thermally developing and fully developed regions. However, in the developing region there is a significant difference between Nusselt distribution with variable thermal conductivity and Nusselt distribution with constant thermal conductivity. In the fully developed region Nusselt distribution with variable and constant thermal conductivities does not drastically differ. © 2012 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21028