Influence of the Different Wall Oscillation Modes on the Heat Transfer Enhancement

Abstract

We studied the influence of the different wall oscillation modes on the heat transfer characteristics of a two-dimensional channel numerically. In this study, the following two channels with different wall oscillation modes were used. One is a two-dimensional channel bounded by the fixed wall and the transversely oscillating wall (channel A) and the other is a two-dimensional channel whose upper and lower wall oscillate transversely in the same manner (channel B). The fully implicit finite difference method was used for the analysis of the conservation equations and the time-dependent coordinate transformations were applied to solve the moving boundary problem. The calculated results are summarized as follows. (1) The wall oscillation takes a remarkable effect on the heat transfer enhancement in a low Reynolds number region for each channel. (2) If we must avoid the increase in the pressure loss, the channel B is suitable for this requirement compared to the channel A.