ループ型並列密閉熱サイフォンの伝熱特性に関する研究 : 熱コンダクタンスによる評価(熱工学,内燃機関,動力など)

概要

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A new type of thermosyphon was experimentally examined mainly for its thermal conductance. It consisted of parallel installed two conventional thermosyphons connected by two U tubes. A conventional single thermosyphon was also tested to compare heat transfer characteristics with the new type. Water and ethanol were used as the working fluid. Experiments were carried out with three different cooling temperatures, 25, 37.5, and 50℃ and two charge ratios, 0.5 and 0.9. The following findings are obtained. The relationship between thermal conductance and heat transfer rate is similar between the new type and the conventional thermosyphons, but the magnitude of the conductance in the former one is much larger than that in the latter due to larger maximum heat transfer rate. The higher coolant temperature gives the higher conductance. The Imura's boiling correlation and Nusselt equation for condensation heat transfer can predict the conductance within -20 to +60%, and then the major reason of the prediction error is in the condensation heat transfer.
一般社団法人日本機械学会の論文
2008-05-25