| 摘要: |
| 实验研究了R22在当量直径为0.952 mm的水平不锈钢矩形管内凝结的气液两相流动压降。实验时的饱和温度为40-50oC、质量流速为200-800 kg/m2 s、干度为0-1。研究结果表明，实验段的压降占总压降95%以上，而出口处流通断面扩张压降所占比例很小可以忽略。R22的压力梯度随质量流速和干度的增大而增大，在较高干度区增大趋势更加明显。随饱和温度的增大压降减小。与R22相比，相同实验工况下R152a的凝结压降小于R22的。 |
| 关键词: 压降 微通道 凝结 实验研究 |
| DOI： |
| 投稿时间：2012-11-05
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| 基金项目: |
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| Experimental Investigation on Two-phase Flow Pressure Drop of R22 during Condensation in a Rectangular Microchannel |
| Liu Na,Li Junming |
| (Department of Thermal Engineering, Tsinghua University) |
| Abstract: |
| The paper reported two-phase flow pressure drop results of R22 during condensation in a horizontal stainless steel rectangular microchannel with the hydraulic diameter of 0.952 mm. Tests were conducted with saturation temperatures of 40-50oC, mass fluxes of 200-800 kg/m2 s and vapor qualities from 0 to 1. The results show that pressure drops in the test section account for more than 95% of the measured pressure drops while the fractions of the expansion pressure drops at the outlet of the test section are small enough to neglect. Pressure gradients of R22 increase with mass flux and vapor quality especially in high vapor quality regions while decrease with the saturation temperature. Pressure gradients of R152a are lower than the data of R22 when compared with the same experimental conditions. |
| Key words: Pressure drop Microchannel Condensation Experimental investigation |
