低圧下での細管内強制流動沸騰限界熱流束

概要

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Critical heat flux (CHF) for flow-boiling of water in small-diameter tubes under low-pressure conditions was measured over a wide range of parameters, and the results were compared with several existing CHF correlations and theoretical models. The experiment was conducted with atmospheric-pressure water in tubes with inner diameter D ranging from 1.0 to 6.0 mm, heated length-to-diameter ratio L/D from 1 to 100, inlet water subcooling ΔT_<in> from 0 to 90 K, and mass velocity G from 0 to 19740 kg/(m^2・s). The highest CHF attained in this experiment was 158 MW/m^2. The results demonstrated the effects of channel geometry and subcooling under low-pressure condition. In, addition, the flow pattern near CHF conditions in a tube with small diameter and short heated length was observed using a high-speed video system. The theoretical model of Celata et al. (Int J. Heat Mass Transf., 1994) for a subcooled condition showed good agreement with the present subcooled data when L/D≧25.
一般社団法人日本機械学会の論文
1995-11-25