高熱流束飽和沸騰で伝熱面上に形成される液膜の厚さの測定 : 第1報,液膜厚さの測定法とプール沸騰での測定結果

概要

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A new technique is developed to measure the thickness of liquid film formed under a coalesced bubble in high heat flux nucleate boiling which is considered to play a major role in the restriction of heat transfer. Thickness of the film is determined by conservation of the heat. The liquid film is formed at the moment a coalesced bubble covers the whole of the surface, which is determined through high-speed photographic obsevation. The initial thickness of the film can be estimated when it dries before the bubble departs, assuming that it is dissipated only by vaporization and there is no liquid inflow. The heat transfer surface is 3.7mm×4mm and made o nickel foil, 5 μm thick , heated electrically to keep its temperature constant. it is surrounded by a copper block-heated surface to avoid liquid inflow. The thickness measured for saturated water at atmospheric pressure is about 15-20μm, which must be made reliable by accumulating a large amouat of data.
一般社団法人日本機械学会の論文
1989-05-25