極微小平面伝熱面の超高速加熱時における沸騰核生成 : 揺らぎ核生成による気泡発生に対する系圧力の影響

概要

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Experiments are carried out to measure the temperature at boiling incipience and observe the bubble formation behaviors on a very small film heater immersed in ethyl alcohol at a pressure in the range from 0.1 to 2.0 MPa and heated with a very high average rate of temperature rise up to 20×10^6 K/s. The temperature at boiling incipience reaches a constant value at rates higher than about 5×10^6 K/s and it agrees very well with the homogeneous nucleation temperature for a given pressure At such a high rate, concurrent generation of a large number of tiny bubbles of maximum number density 7.0×10^<10>l/m^2 is observed, the diameter becomes smaller and the number density becomes larger with the increase of pressure, and the number density versus the surface temperature agrees with that predicted by the fluctuation nucleation theory. The bubble formation is concluded to be due to fluctuation nucleation.
社団法人日本機械学会の論文
1996-08-25