Boiling Nucleation on a Very Small Film Heater Subjected to Extremely Rapid Heating : Effect of Ambient Pressure on Bubble Formation by Fluctuation Nucleation
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概要
- 論文の詳細を見る
The effect of ambient pressure on the dynamics of bubble formation in liquid heated rapidly to the limit of superheat is investigated by heating a fine film heater immersed in ethyl alcohol at a high rate of temperature rise up to 20×10^6K / s. The heater surface temperature at boiling incipience increases with the increase of the rate of temperature rise and saturates at the rate higher than about 5×10^6K / s. The saturated temperature agrees well with that of homogeneous nucleation in an ambient pressure range from 0.1 to 2.0 MPa. The nucleated bubbles become smaller to coalesce with the increase of ambient pressure and the measured number density of them reaches 7.0×10^<10>l / m^2 for the maximum. The increase of the number density versus the surface temperature agrees qualitatively with that predicted by the fluctuation nucleation theory. As the result, the bubble formation observed at a higher rate of temperature rise is concluded to be due to fluctuation nucleation.
- 一般社団法人日本機械学会の論文
- 1997-05-15
著者
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OKUYAMA Kunito
Department of Chemical Engineering Science, Yokohama National University
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IIDA Yoshihiro
Department of Chemical Engineering Science, Yokohama National University
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Okuyama Kunito
Department Of Materials Science And Chemical Engineering Yokohama National University
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Okuyama Kunito
Department Of Artifical Environment And Systems Yokohama National University
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Iida Yoshihiro
Department Of Artificial Environment And Systems Yokohama National University
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ENDOU Tetsuya
Department of Materials Science and Chemical Engineering, Yokohama National University
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KANDA Nobumasa
Department of Materials Science and Chemical Engineering, Yokohama National University
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Endou Tetsuya
Department Of Materials Science And Chemical Engineering Yokohama National University
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Kanda Nobumasa
Department Of Materials Science And Chemical Engineering Yokohama National University
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