Transient conjugated heat transfer in thick walled pipes with uniform heat flux boundary condition

Abstract

Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007.Transient conjugated heat transfer in thick walled pipes for thermally developing laminar flow is investigated involving two dimensional wall and axial fluid conduction. The problem is solved numerically by a finite difference method for hydrodynamically developed flow in a two regional pipe, initially isothermal in which the upstream region is insulated and the downstream region is subjected to a suddenly applied uniform heat flux. A parametric study is done to analyze the effects of four defining parameters namely, wall thickness ratio, wall-to-fluid thermal conductivity ratio, wall-to-fluid thermal diffusivity ratio and the Peclet number. The results are given by non-dimensional interfacial heat flux values, and it is observed that, heat transfer characteristics are strongly dependent on the parameter values.