B222 高温面上の液滴衝突時の急速蒸気生成過程(固液相変化を伴う伝熱現象V)

概要

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Rapid vapor generation during impact of a single ethanol droplet on a hot surface was observed for well understanding of wetting phenomena. Photographs during a single droplet impacting on a surface at 190 - 210 oC were taken by a high speed digital camera with a microscope. Copper and carbon steel were used for the surface material. The liquid subcooling was varied from 10 to 50 K. The boiling situation changes from nucleation boiling to film boiling like as the boiling transition in pool boiling. Delay time to develop vapor film on the hot surface was measured from the observations. While the delay time increases with increase of subcooling and decrease of thermal inertia of the solid for the lower surface temperature, it shows constant for the higher surface temperature above the superheat limit of liquid.
一般社団法人日本機械学会の論文
2009-11-06