301 容器内自然対流における重力揺動による熱流束変動の検出

概要

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In on-orbit experiments of the fluid dynamics, the fluid is inevitable exposed to the fluctuation of the gravity level called as the g-jitter. The dynamic behavior is affected by the g-jitter. In this research, the natural convection in a closed cylindrical vessel subjected to the g-jitter during the parabolic flight was studied experimentally. The vessel was filled by water as test fluid, and its wall was cooled by cooling water. Two thin metal films were evaporated on a rod installed along a cylinder axis, and these films were kept at a constant temperature electrically. Thus the variation of the surface heat flux was able to be measured through the change of the heating. The related numerical analyses are also performed. When a g-jitter of a high frequency is applied, the phase difference arises between he gravity and the heaters' heat flux variations. The phase shift found in the present experiment agrees with the estimation from this numerical analysis.
一般社団法人日本機械学会の論文
2002-03-14