人工水晶育成における超臨界圧下の自然対流

概要

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Natural Convection under supercritical pressure in autoclave for growing the quartz crystal take place by force balance when buoyancy by temperature increasing at heating section has much advantage than density increasing by dissolving the silica into alkalline solution. Additional friction forces consisting of bafflc placed in center position and nutrient, seed materials should be considered. Experiments using water under normal pressure could simulate natural convection. The linear relation between logarithm of heat transfer from heating to cooling section and temperature gradient indicated the equation below, Q=A・ΔAT^m (m=1.55, 1.90) Experiments using water under supercritical pressure also indicated the linear relation between log Q and log ΔT. The index (m) of 1.7 in case of baffle closure more than 88% was similar to that of under normal pressure.
日本結晶成長学会の論文
1989-09-25