Fluid Flow and Heat Transfer in Corrugated Wall Channels : 4th Report, Analysis in the Case Where Channels Are Bent Many Times

Abstract

Corrugated wall channels are investigated as a means of augmenting forced-convection heat transfer with a single-phase flow in heat exchangers. The fluid flow state and the heat transfer characteristic of the parallel channels bent many times, which are appropriate models of corrugated wall channels, are analyzed by the finite difference method with an adequate "periodic boundary condition" for the laminar flow where the pitch P=1∼8, the bending angle θ=0°∼90° and Reynolds number Re=0∼2400, and for the turbulent flow where P=1∼8, θ=90° and Re=40000. Consequently, the effects of P and θ on the aspect of flow, the distributions of the wall shear stresses and the local Nusselt numbers, the pressure loss and the mean Nusselt number are clarified, and the performance of the corrugated wall channels as heat exchangers is estimated in terms of the volume goodness factor.