On the Thermal Stress in Liquid under the Supersonic and Hypersonic Fields
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概要
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Considering the Maxwellian relaxational process for the plastoelastic body, a generalized thermodynamical equation of state for liquids, is presented. The theological constants, thermal expansion coefficients, and specific heats, are all considered as operators of Maxwellian type accompanied by relaxation times. An attempt is made to describe the equation of conservation of energy (in the macroscopic sense), based on the phenomenological model. As the author's theory includes the better charcters of both Frenkel-Obratzov-Oshida's and Kneser's theories, the complicated temperature dependence of the absorption and dispersion of ultrasonics in various kinds of liquids, may be possibly explained by this theory. The present equations can, also, be conveniently applied, mutatis mutandis, to the description of mechanical behaviours of any phase of plasto-elastic bodies, such as gases and solids, as well as liquids.
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