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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v17.i1.40
pages 59-75

Two-Phase Refrigerant Distribution in a Parallel-Flow Heat Exchanger

Nae-Hyun Kim
Department of Mechanical Engineering, Incheon National University, 12-1 Songdo-Dong, Yeonsu-Gu Inchon, 22012, Korea
D. Y. Kim
Graduate School, University of Incheon, #177 Dohwa-Dong, Nam-Gu, Incheon, 402-749, Korea

ABSTRACT

The distribution of R-134a flow is experimentally studied for a heat exchanger composed of round headers and 10 flat tubes. The effects of tube protrusion depth as well as mass flux and quality are investigated. The flow at the header inlet is stratified. The results are compared with the previous air−water results, where the flow at the header inlet is annular. For the downward flow configuration, most of the liquid flows through the frontal part of the header. The distribution of liquid improves as the protrusion depth or the mass flux increases, or the quality decreases. For the upward configuration, most of the liquid flow through rear part of the header. The liquid distribution improves as the mass flux or quality decreases. The protrusion depth has a minimal effect. Comparison of the present data on a stratified inlet flow with those of the previous annular inlet flow reveals that an inlet flow pattern has a significant effect on flow distribution. Generally, the effect of a tube protrusion depth, mass flux or quality on liquid distribution is much stronger for an annular inlet flow, probably due to a high gas velocity. Liquid distribution of the stratified inlet flow is better than that of the annular inlet flow. For the downward flow, the effect of quality on liquid distribution of the stratified inlet flow is opposite to that of the annular inlet flow. For the upward flow, the effect of the mass flux or quality of the stratified inlet flow is opposite to that of the annular inlet flow. Possible explanation is provided from the flow visualization results.


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