均一自発核生成過程の伝熱モデル : 高速加熱の場合について(熱工学,内燃機関,動力など)

概要

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A model is proposed to elucidate homogeneous nucleation generation which suddenly occurs in a metastable liquid when liquid is rapidly superheated. In the model, a control volume having the size of a characteristic critical cluster at the liquid boundary is considered and the corresponding energy balance equation is obtained by considering two parallel competing processes taking place inside: transient external energy deposition and internal energy consumption due to bubble nucleation and subsequent growth. The occurrence of homogeneous nucleation generation is defined when bubble generation and growth in the cluster cause the average liquid temperature in the cluster to change from an incease to a decrease. The model is applied, for example, for the case of water rapid heating at atmospheric pressure with some identical initial and boundary conditions reported in the concurrent literature. The predicted times when homogeneous nucleation generation occurs are found to be in good agreement with the experimental observations particularly at relatively lower rates of boundary heating.
2010-10-25