Reference mean temperature for evaluation of performance of thermal diffusion column for isotope separation.
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概要
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In order to evaluate separative performance of a thermal diffusion column, a simplification is usually made in which the temperature dependence of the relevant properties such as thermal diffusion constant is ignored and some proper mean values evaluated at a specific "mean" temperature are used. Adoption of weighted average of temperature distribution is common for the "mean" temperature, but there exists no definite way of determining mean temperature. The present paper proposes a new reference mean temperature determined by the equation governing the free convection. It is based on the fact that the multiplication effect of free convection is essential to separation by thermal diffusion column. The reference mean temperature is related to pressure difference between top and bottom of column and is higher than a mass-averaged temperature (due to gravitational force) by a contribution of viscous force. The reference mean temperature was calculated, as a reference, for an Ar isotope separating column with an inner hot radius of 0.2 mm and an outer cold radius of 5 mm. The results confirmed the validity of an approximate formula expressing effects of temperature difference and ratio of inner and outer radii of column explicitly for the temperature. The reference mean temperature calculated from pressure difference given by axisymmetric solution of equations of change was in good agreement with the analytical solution.
- 一般社団法人 日本原子力学会の論文
著者
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Kanagawa Akira
Department Of Nuclear Engineering Faculty Of Engineering Nagoya University
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Yamamoto Ichiro
Department Of Chemistry Graduate School Of Science The University Of Tokyo
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