Abstract
Heat transfer characteristics in the developing region of a flat channel with a combination of a dimpled surface and a protruded surface were investigated experimentally for relatively low Reynolds numbers of Re = 1000 - 5000. Detailed local heat transfer characteristics were measured by the naphthalene sublimation method. The influence of the protruded surface on the local heat (mass) transfer characteristics of the dimpled surface was observed clearly inside the dimples in the transitional Reynolds number range of Re = 1500 - 3000, while the heat transfer on the protruded surface was not influenced so much by the geometry of the opposed surface. Under the condition of the constant pumping power, the mean Sherwood number of the channel with the dimpled/protruded surfaces was 1.5 - 1.6 times higher than that of the smooth flat channel.
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