Abstract
Using the time-space averaged momentum and energy equations obtained in the preceding report, a theoretical relation was derived to estimate the drag increase and the heat-transfer enhancement in the channel with a turbulence promoter. The investigation of the relation and the results of DNS for the channel with a wing-type vortex generator (VG) show that the heat-transfer efficiency η (i. e., the ratio of the heat transfer enhancement to the drag increase from the smooth channel) is larger when VG is installed in the laminar flow than in the turbulent flow from the following reasons. (I) The large pressure drag on VG in the turbulent flow decreases η. (II) The change of velocity distribution from the laminar parabolic one increases the convective heat transfer near the wall. This effect raises η without the penalty of drag increase.
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