セラミックスの耐熱衝撃性評価に関する研究 : 第4報,低沸点媒体の過渡沸騰曲線および熱応力

概要

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Quenching mediums of low boiling point such as water or oil, are generally used in thermal shock tests. However, these mediums are boiled in the course of the cooling of the specimen. Therefore, the boiling heat transfer coefficients vary largely according to the surface temperature of the specimen, the subcooled temperature of the medium, and the falling speed of the specimen. In this paper, transient boiling curves of water and silicon oil are obtained by experiments and using these curves, thermal stresses of ceramics at quenching in water are analysed numerically by the finite-element method. As a result, it is clarified that the transient boiling heat flux is larger than that of pool boiling, and the maximum thermal stress is affected by transition or film boiling. In the case of specimen with a small diameter, maximum thermal stress decreases in spite of the increase of temperature difference.
一般社団法人日本機械学会の論文
1992-08-25