航空機を用いた微小重力下でのスプレー冷却実験

概要

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Spray cooling experiments were carried out in an aircraft making sequential parabolic flights. CFC-113 and water were used alternately as the coolant which was sprayed onto a plane surface of an electrically heated copper block. Transient cooling of the block was continuously recorded for each experiment to deduce the heat flux (q) vs. surface superheating (ΔT_<sat>) relationship at a nearly constant gravity level which was either reduced (〜10^<-2>g_e) or elevated (〜1.5 or 2g_e) from the terrestrial gravity level, 1g_e. The q-ΔT_<sat> relation for CFC-113 showed a slight shift in the direction of decreasing ΔT_<sat> and a decrease of the peak heat flux by about 10% with the reduction in gravity. As for water sprayed at a rather low rate, the reduction in gravity resulted in both the shift of the q-ΔT_<sat> relation in the direction of decreasing ΔT_<sat>, and an increase in the peak heat flux. Such gravity dependences of heat transfer were lost at a rather high rate of water spraying.
一般社団法人日本機械学会の論文
1995-03-25