環状二相密閉形サーモサイホンの凝縮部伝熱特性

概要

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Visual observations of flow patterns at the condenser and heat transfer measurements were conducted for heat transfer rate ranges of 18-1800W using a vertical annular device with various quantities of R113 as a working fluid. As a result of visual observations, it is shown that ripples (interfacial waves) are generated on the condensate film surface when the condensate film Reynolds number exceeds approximately 20, and the condensation heat transfer is promoted. A simple theoretical analysis was presented in which the effects of interfacial waves and vapor drag were considered. This analysis agreed very well with experimental results when the working fluid quantity was not so large that the two-phase mixture generated by boiling of the working fluid didn't reach the condenser. The effects of interfacial waves and vapor drag on condensation heat transfer were also investigated theoretically.
一般社団法人日本機械学会の論文
1986-10-25