鉛直管内での水素および窒素の層流膜状凝縮熱伝達に関する研究

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  • Study on Laminar Film Condensation Heat Transfer of Hydrogen and Nitrogen Inside a Vertical Tube.
  • エンチョクカン ナイ デ ノ スイソ オヨビ チッソ ノ ソウリュウ マクジョウ ギョウシュク ネツ デンタツ ニ カンスル ケンキュウ

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There have been quite few experimental investigations in the area of condensing heat transfer to cryogenic fluids. The investigations with nitrogen and exygen have shown reasonable agreement between experimental data and those predicted by Nusselt's theory. On the other hand, in the previous investigations with much colder fluids, such as hydrogen, deuterium and helium, the experimental condensing heat transfer coefficients are smaller than those predicted by Nusselt's theory and those differences become much larger when film Reynolds number or decreasing temperature difference across the condensate film is decreased. In the present investigation, hydrogen and nitrogen were condensed inside a vertical tube(d=15mm, L=30mm)under steady-state conditions respectively and condensing heat transfer coefficients were precisely measured. From the experimental resuls, the condensing heat transfer coefficients for saturated hydrogen and nitrogen vapors agree with those predicted by the Nusselt's theory within ±20%. The results of the present study suggest that deuterium and helium might also behave as predicted by the Nusselt's theory.

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