蛇行閉ループ式熱輸送デバイスに関する研究 : 蒸気プラグ伝ぱ現象について〔熱工学, 内燃機関, 動力など〕

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In the present paper, heat transport rates and fluid flow patterns of the meandering closed-loop heat-transport device (MCL-HTD) were experimentally and analytically investigated by using water as an operating liquid. In this type of HTD, heating and cooling parts are connected with each other by a closed loop of tube meandering between them, and operating liquid of a volume fraction is enclosed in the meandering loop. First, heat transport rates of the HTD were measured and it was shown that the effective thermal conductivity of MCL-HTD is much higher than the thermal conductivity of copper. Next, observation of fluid flow in the MCL-HTD was conducted and it was found that a simple flow pattern appears at a high volume fraction of liquid. In such a condition, only two vapor plugs exsist separately in adjacent turns, and one of them starts to grow when the other starts to shrink. When the latter plug disappears, a new vapor plug appears in the turn adjacent to the turn including the grown-up vapor plug. This vapor-plug propagation phenomena was numerically analyzed by a model, and it was shown that the propagation induces liquid flow from the heating to cooling parts or the cooling to heating parts. Such liquid flow results in large temperature differences between the liquid and tube wall at the heating and cooling parts.
社団法人日本機械学会の論文
1998-06-25