核沸騰現象の理論的解析

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  • Theoretical Analysis of Nucleate Boiling
  • カク フットウ ゲンショウ ノ リロンテキ カイセキ

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In nucleate boiling a bubble created at a nuclation site on a heating surface grows, leaves the surface and rises. The liquid motion induced in the thermal boundary layer during this process is calculated and the heat flux carried by this liquid motion to a nucleation site is obtained. The heat flux thus calculated is equal to that transferred from the heating surface to the liquid by conduction and to the latent heat carried away by bubbles per unit time. From these relations the following theoretical formula is obtained. [numerical formula] where Δθ is a difference between the temperature of heating surface and the saturation temperature, n is nucleation density and q is average heat flux. This resembles in form closely to the following experimental formula which was obtained through measurement by Nishikawa : [numerical formula] The numerical values computed from these two formulas are in fairly good agreement with each other.

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