二相二重管熱サイフォン内の流動と熱伝達 : 入口サブクール度の影響

概要

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An experimental study was performed to investigate the effect of subcooling on the flow and heat transfer in two-phase double-tube thermosyphons with three types of inner tubes using water, ethanol and Freon 113 as the working fluids. The same experiment for a single-tube thermosyphon was also carried out for comparison. As a result, a correlating expression for the heat transfer coefficients in two-phase double- and single-tube thermosyphons was presented. The expression presented by taking account of subcooling and the properties of the working fluids, agreed well with the experimental data. The critical heat flux increased slightly with the increase in the degree of subcooling, and the rate of increase for the double-tube thermosyphon was bigger than that for the single-tube one. The circulation mass velocity first increased and then decreased, as the heat flux increased. After that, it increased again at a certain heat flux. This behavior was observed for both saturated and subcooled boiling. However, this curve was shifted to a larger heat flux direction as the degree of subcooling increased.
社団法人日本機械学会の論文
1993-01-25