Theoretical calculations of pressure transient and bubble growth were performed for analyzing the experiment on incipient boiling of superheated pota£sium. The non-equilibrium bubble growth theory with use of evaporation coefficient C and the as£umption of quadratic temperature distribution near the interface was combined with the inertial constraint of the finite liquid system which consists of the spherical motion around the bubble and linear motion of upper column.The combined theory could successfully explain the experimental result that the bubble pressure rises toward the saturation pressure corresponding to the initial bulk temperature after attaining a minimum. A fairly good agreement with the experiment was obtained for a value of C=0.005-0.01 on the transients of pressure as well at· bubble radius. Half recovery times of the bubble preswre measured also agreed well with the calculation for C=0.005.

Theoretical calculations of pressure transient and bubble growth were performed for analyzing the experiment on incipient boiling of superheated pota£sium. The non-equilibrium bubble growth theory with use of evaporation coefficient C and the as£umption of quadratic temperature distribution near the interface was combined with the inertial constraint of the finite liquid system which consists of the spherical motion around the bubble and linear motion of upper column.The combined theory could successfully explain the experimental result that the bubble pressure rises toward the saturation pressure corresponding to the initial bulk temperature after attaining a minimum. A fairly good agreement with the experiment was obtained for a value of C=0.005-0.01 on the transients of pressure as well at· bubble radius. Half recovery times of the bubble preswre measured also agreed well with the calculation for C=0.005.

Abstract

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