R22在矩形微细管内凝结的气液两相流动压降实验研究

实验研究了R22在当量直径为0．952mm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—50％、质量流速为200～800kg/（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；相同实验工况下R152a的凝结压降小于R22的凝结压降。...

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Bibliographic Details
Published in制冷学报 Vol. 34; no. 4; pp. 24 - 29
Main Author 刘纳 李俊明
Format Journal Article
LanguageChinese
Published 清华大学热能工程系 北京100084 2013
Subjects
两相流
凝结
压降
实验研究
微通道
矩形微细管
microchannel
矩形微细管
experimental investigation
rectangular microchannel
压降
实验研究
condensation
两相流
pressure drop
凝结
微通道
two-phase flow
Online AccessGet full text
ISSN0253-4339
DOI10.3969/j.issn.0253-4339.2013.04.024

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Summary:实验研究了R22在当量直径为0．952mm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—50％、质量流速为200～800kg/（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；相同实验工况下R152a的凝结压降小于R22的凝结压降。
Bibliography:rectangular microchannel ; two-phase flow ; pressure drop ; microchannel ; condensation ; experimental investigation
11-2182/TB
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 40-50℃, mass fluxes of 200-800kg/（ 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 satura- tion temperature. Pressure gradients of R152a are lower than the data of R22 when compared with the same experimental conditions.
Liu Na Li Junming （Department of Thermal Engineering, Tsinghua University, Beijing, 10008
ISSN:0253-4339
DOI:10.3969/j.issn.0253-4339.2013.04.024