混合液の沸騰過程における生成蒸気濃度に関する実験的研究 : 気泡内蒸気の温度・濃度変化特性の測定 : 熱工学 , 内燃機関 , 動力など
2001 年 67 巻 654 号 p. 459-465
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2001 年 67 巻 654 号 p. 459-465
The variations of the vapor concentration of water-ethanol mixture during saturated nucleate pool boiling were studied. The temperature changes of vapor in the generated bubbles measured at several different positions near the boiling surface by using thin thermocouple having high responsibility. The superheat of bubbles were initially higher in the superheated liquid layer near the heat transfer surface and then approached the bulk temperature with moving upwards. It was clarified that the temperature and the concentration differences of the bubbles from the bulk almost disappeared at the height of 3 to 5 mm from the heat transfer surface and within 20 ms after the appearances. As a result, the former result of the liquid-vapor equilibrium at the bulk condition was confirmed.
