Flow characteristics in stationary two-pass channels with a sharp turn have been measured using LDV (laser Doppler velocimeter), directing special attention to the influence of the size of the turn clearance on the flow structure. The main features of the flow, flow separation and recirculation, secondary flow, turbulence intensities, measured with for three turn clearances, are presented. A close comparison of the velocity data with local Sherwood number distributions on the channel walls reveals that the wall-normal velocity mainly dominates the heat transfer in the channel, but the wall-parallel component also contributes locally to heat transfer after the turn.
Issue Section:
Technical Papers
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.Copyright © 2006
by American Society of Mechanical Engineers
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