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Theoretical study of evaporation heat transfer in horizontal microfin tubes: stratified flow model

机译：水平微翅片管内蒸发传热的理论研究：分层流模型

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摘要

The stratified flow model of evaporation heat transfer in helically grooved, horizontal microfin tubes has been developed. The profile of stratified liquid was determined by a theoretical model previously developed for condensation in horizontal microfin tubes. For the region above the stratified liquid, the meniscus profile in the groove between adjacent fins was determined by a force balance between the gravity and surface tension forces. The thin film evaporation model was applied to predict heat transfer in the thin film region of the meniscus. Heat transfer through the stratified liquid was estimated by using an empirical correlation proposed by Mori et al. The theoretical predictions of the circumferential average heat transfer coefficient were compared with available experimental data for four tubes and three refrigerants. A good agreement was obtained for the region of Fr{sub}0 < 2.5 as long as partial dry out of tube surface did not occur.
机译：建立了螺旋沟槽水平微翅管中蒸发传热的分层流模型。分层液体的轮廓由先前为水平微翅片管中的冷凝建立的理论模型确定。对于分层液体上方的区域，相邻翅片之间凹槽中的弯液面轮廓由重力和表面张力之间的力平衡确定。应用薄膜蒸发模型预测弯月面薄膜区域的热传递。通过使用Mori等人提出的经验相关性估算通过分层液体的热传递。将周向平均传热系数的理论预测与四个管道和三种制冷剂的可用实验数据进行了比较。只要Fr {sub} 0 <2.5的区域获得良好的一致性，只要不发生管表面的部分干燥即可。

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