一般論文
ミニギャップ内沸騰系における扁平気泡と伝熱面間の薄液膜形成特性
2012 年 78 巻 793 号 p. 1572-1583
詳細
2012 年 78 巻 793 号 p. 1572-1583
In this study, experiments were performed to measure the thickness of the liquid film formed between the heating surface and the vapor bubble with the laser extinction method for the gap size of 0.5, 0.3 and 0.15mm.Water, toluene and HFE7200 were used as test fluids. It was found that the gap size and bubble forefront velocity determined the initial thickness of microlayer no matter of the kind of testing liquid. Vapor bubble generated by boiling in the present mini-gap grows exponentially due to the rapid evaporation of the thin liquid layer, which makes the phenomena highly transient as opposed to the steady situations considered before. Based on the experimental data and scaling arguments a non-dimensional correlation in terms of capillary number and Bond number is proposed.
