チャネル中の超臨界圧ヘリウム自然対流熱伝達

概要

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Natural convection heat transfer of supercritical helium in laminar flow are measured on a vertical surface with and without the channel, which has the sizes of 10mm width, 0.4mm gap and 130mm length. The experimental pressures are from 0.25 to 0.8MPa and fluid temperatures are about 4.2K. The results show that the channel effects on heat transfer coefficients are in the range of about ±20%. The conventional non-dimensional equation for laminar flows with constant properties is successfully applied to correlate, the results by using film temperature in the case when it is below the pseudocritical temperature, and pseudocritical temperature in the opposite case, as the reference temperature in evaluating the properties of helium. Another convection source in the channel increases the heat transfer further when the temperature difference between wall and fluid is less than 10K, but not above it.
社団法人日本機械学会の論文
1991-10-25