| 摘要: |
| 碳氢工质在液化天然气用螺旋折流板管壳式换热器壳侧的两相流型决定了换热器的换热性能。本文通过可视化实验方法测试了丙烷和乙烷/丙烷混合物在螺旋折流板管壳式换热器壳侧的两相流型。测试结果表明：随着干度的增大，实验依次观测到了分层流、分层-雾状流和雾状流三种流型；随着丙烷的质流密度从20 kg/(m2·s)增加至40 kg/(m2·s)，分层流至分层-雾状流的转化干度从0.7减小为0.3，而分层-雾状流至雾状流的转化干度从接近1减小为0.7；当乙烷的比例从0%增加至50%时，分层流至分层-雾状流的转化干度从0.3~0.45增长至0.43~0.55，而分层-雾状流至雾状流的转化干度从0.69~0.85增长至0.83~接近1。已有的水-空气混合物的流型图无法适用于碳氢工质的流型预测，新建立的流型转化准则对于实验的分层流、分层-雾状流和雾状流的预测偏差约为6.5%、5.5%、4.2%。 |
| 关键词: 混合制冷剂 两相流 流型 壳侧 螺旋折流板 |
| DOI： |
| 投稿时间：2023-09-17修订日期：2023-11-30 |
| 基金项目:国家自然科学基金（52104067）资助项目 |
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| Experimental Investigation on Two-phase Flow Pattern of Hydrocarbon Refrigerants in Shell Side of Helically Baffled Shell and Tube Heat Exchanger |
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| Abstract: |
| Two-phase flow pattern of hydrocarbon working fluids in the shell side of a helically baffled heat exchanger for liquefied natural gas determines the heat transfer performance of the heat exchanger. In this study, the two-phase flow patterns of propane and ethane/propane mixtures in the shell side of a helically baffled heat exchanger were tested using a visualization experimental method. The test results show that with the increase of vapor quality, the experimental observations sequentially included stratified flow, stratified-spray flow, and spray flow; as the mass flux of propane increases from 20 kg/(m2·s) to 40 kg/(m2·s), the transition vapor quality from stratified flow to stratified-spray flow decreases from 0.7 to 0.3, while the transition vapor quality from stratified-spray flow to spray flow decreases from close to 1 to 0.7; when the proportion of ethane increases from 0% to 50%, the transition vapor quality from stratified flow to stratified-spray flow increases from 0.3~0.45 to 0.43~0.55, while the transition vapor quality from stratified-spray flow to spray flow increases from 0.69~0.85 to 0.83~close to 1. The existing flow pattern map for water-air mixtures was found to be inadequate for predicting the flow patterns of hydrocarbon working fluids. A new set of flow pattern transition criteria was established, with prediction deviations of approximately 6.5%, 5.5%, and 4.2% for the experimental stratified flow, stratified-spray flow, and spray flow, respectively. |
| Key words: mixed refrigerants two-phase flow flow pattern shell side helical baffle |
