Heat Transfer Model for Evaporation in Microchannels, Part I: Presentation of the Model
Heat Transfer Model for Evaporation in Microchannels, Part I: Presentation of the Model
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2004.01.006
复制
发表时间：
2004-07
影响因子：
2.2
通讯作者：
J. Thome;V. Dupont;A. Jacobi
中科院分区：
文献类型：
--
作者：
J. Thome;V. Dupont;A. Jacobi
提出了一个描述细长气泡在微通道内蒸发的三区流动沸腾模型。传热模型描述了局部传热系数在（i）液体段塞、（ii）蒸发细长气泡和（iii）蒸汽段塞的顺序和循环通过期间的瞬态变化。由此得到时均局部传热系数。新的模型说明了强循环变化的重要性，在传热系数和强烈的依赖性的气泡频率上的传热，最小的液膜厚度在干涸和液膜形成厚度。
A three-zone flow boiling model is proposed to describe evaporation of elongated bubbles in microchannels. The heat transfer model describes the transient variation in local heat transfer coefficient during the sequential and cyclic passage of (i) a liquid slug, (ii) an evaporating elongated bubble and (iii) a vapor slug. A time-averaged local heat transfer coefficient is thus obtained. The new model illustrates the importance of the strong cyclic variation in the heat transfer coefficient and the strong dependency of heat transfer on the bubble frequency, the minimum liquid film thickness at dryout and the liquid film formation thickness.