液体窒素の過渡沸騰伝熱特性 : 急加熱時の沸騰気泡挙動と熱伝達履歴

概要

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Transient boiling heat-transfer characteristics of liquid nitrogen at stepwise heat input have been investigated. A series of heat-transfer experiments have been carried out using a 0.10-mm-dia.horizontal platinum wire as the test heater. Bubble behavior has been observed by taking high-speed movie photographs. The time history of the heat-transfer rate has been shown to have a good correspondence with the bubble behavior during transition to film boiling. In the case of low heat input, boiling transition occurs due to the coalescence of nucleate boiling bubbles. In the case of high heat input, a vapor sheath grows along the test wire. Boiling transition occurs due to surrounding of the vapor sheath, and heat-transfer rate becomes much lower than that of stable film boiling. In the case of extremely high heat input, numerous fine bubbles grow rapidly and simultaneously when the heater temperature reaches homogeneous nucleation temperature. Boiling transition occurs due to filling of bubbles on the heater.
一般社団法人日本機械学会の論文
1990-06-25