An experimental investigation on pressure drop of steam condensing in silicon microchannels
An experimental investigation on pressure drop of steam condensing in silicon microchannels
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DOI：
10.1016/j.ijheatmasstransfer.2008.03.028
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发表时间：
2008-10
影响因子：
5.2
通讯作者：
Xiaojun Quan;P. Cheng;Huiying Wu
中科院分区：
文献类型：
--
作者：
Xiaojun Quan;P. Cheng;Huiying Wu
实验研究了水蒸气在4个光滑梯形硅微通道内的凝结压降，通道水力直径分别为109μm、142μm、151μm和259μm。结果表明，微通道内的两相摩擦压降受水力直径、质量流量和干度的影响较大。微通道中的两相压降数据进行比较，现有的相关性的基础上的均相模型和分离流模型，以确定其适用于冷凝流在微通道中的宏和小通道。修正的Matinelli-Chisholm常数的关联式，考虑到表面张力和直径的影响，在Lockhart-Martinelli关联式的形式开发的蒸汽冷凝在微通道中的压降。得到的冷凝压降关联式与实验值的误差在±15%以内。
Experiments are carried out to study the two-phase pressure drop for water vapor condensation in four smooth trapezoidal silicon microchannels having hydraulic diameters of 109μm, 142μm, 151μm, and 259μm, respectively. It is found that two-phase frictional pressure drops in the microchannels are greatly influenced by the hydraulic diameter, mass flux and vapor quality. The two-phase pressure drop data in microchannels are compared with existing correlations for macro- and mini-channels based on the homogenous model and the separated flow model to determine their applicability to condensing flows in microchannels. A modified correlation for the Matinelli–Chisholm constant, taking into consideration of surface tension and diameter effects, is developed in the form of the Lockhart–Martinelli correlation for the pressure drop in steam condensation in microchannels. The resulting condensation pressure drop correlation equation is within ±15% of the experimental data.