膜沸騰熱伝達に関する研究 : 第2報, 大気圧および加圧下の水における垂直棒

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  • Research on the Film Boiling Heat Transfer : 2nd Report, Vertical Rods in Water
  • マク フットウ ネツ デンタツ ニ カンスル ケンキュウ 2

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Film boiling of water on the horizontal rods and wires was discussed in the first report. In this paper is reported the experiments on the boiling of water at the atmospheric pressure and at higher pressures from vertical electrically heated SiC rods. The coefficients of heat transfer obtained were in agreement with those predicted by Bromley's theory when the vertical rods were short (50, 75 mm in length), but were not in agreement when the vertical rods were longer (125, 165, 225 mm in length). The heat transfer coefficient measured increased with the rise of pressure. The empirical equation obtained was as follows : [numerical formula] where j=0, l=0.9, m=1/4, n=1/4 for shorter rods, j=0, l=0.5, m=1/3, n=1/4 for longer rods and j=1/4, l=0.5, m=1/3, n=1/4 for pressures higher than the atmospheric pressure.

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