細線における沸騰現象への汚れの影響に関する研究(熱工学,内燃機関,動力など)

概要

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Pool boiling experiments with small wires were conducted in earth gravity and microgravity conditions. Bare surface and fouling surface with scale deposition of calcium carbonate was used. The wettability on the scale surface was higher than that on the bare surface. Though the more vigorous bubbling was observed on the scale surface compared to that on the bare surface at the same heat flux, the boiling curve for the scale surface was approximately the same as that on the bare surface. However, the critical heat flux on the scale surface was higher than that on the bare surface. On the scale surface, the departure diameter of bubbles is relatively smaller than that on the bare surface. The smaller diameter of bubbles detaching from the scale surface is considered to be due to the high wettability and nucleation site density. As the result, the coalescence of bubbles near the surface was prevented and the CHF was delayed and increased on the scale surface compared to that on the bare surface.
社団法人日本機械学会の論文
2003-08-25