スプレー冷却中の高温面のぬれ開始温度特性 : 第2報,高温面の一部をスプレー冷却した場合(<小特集>究極の除熱性能を目指して)

概要

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An experimental study has been done to elucidate effects of mass flux G, degree of subcooling ΔT_<sub>, initial solid temperature T_<bo> and thermal properties of test liquid and hot block on wetting temperature during spray cooling of a hot block. The heated surface was cooled nonuniformly with spray, which impinged partially on the surface. This experiment partly simulates actual spray cooling with multiple sprays. The experiments were done up to maximum mass flux of 72kg/(m^2s) with fixed subcooling of 60K with copper and carbon steel blocks for ethanol spray. Transient transition region is categorized into two regions from history of heat flux change. The wetting temperature corresponding to the minimum heat flux point wall temperature and the quench temperature were also evaluated. The wetting temperature increases with GΔT_<sub> beyond the surface temperature corresponding to liquid superheat limit temperature.
社団法人日本機械学会の論文
2009-10-25