| 制冷剂CO_2两相流动及沸腾传热特点分析 |
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| 引用本文： | 杨俊兰,马一太,李敏霞,田华. 制冷剂CO_2两相流动及沸腾传热特点分析[J]. 工程热物理学报, 2009, 30(12) |
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| 作者姓名： | 杨俊兰 马一太 李敏霞 田华 |
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| 作者单位： | 1. 天津城市建设学院能源与机械工程系,天津,300384
2. 天津大学热能研究所,天津,300072 |
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| 基金项目： | 国家自然科学基金，天津市高等学校科技发展基金计划项目 |
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| 摘 要： | 为了能够设计出高效的 CO2 蒸发器,有必要对 CO2 两相流动和沸腾传热特点进行研究.通过理论模拟计算发现,CO2 出现液滴夹带时的临界气相速度远小于传统制冷工质,CO2 的液体夹带率比传统制冷剂高,这说明了环状流是CO2 两相流动的主要型式.CO2 的核态沸腾抑制干度值比较大,大约为传统制冷剂的 1.5 倍左右,表明 CO2 的流动沸腾传热机理主要是核态沸腾占主导地位.CO2 出现干涸时的干度比较低,说明发生干涸现象比传统制冷剂较早.
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| 关 键 词： | 二氧化碳 沸腾换热 两相流动 干涸现象 |
ANALYSIS OF TWO-PHASE FLOW AND BOILING HEAT TRANSFER PERFORMANCE OF REFRIGERANT CARBON DIOXIDE |
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| YANG Jun-Lan,MA Yi-Tai,LI Min-Xia,TIAN Hua. ANALYSIS OF TWO-PHASE FLOW AND BOILING HEAT TRANSFER PERFORMANCE OF REFRIGERANT CARBON DIOXIDE[J]. Journal of Engineering Thermophysics, 2009, 30(12) |
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| Authors: | YANG Jun-Lan MA Yi-Tai LI Min-Xia TIAN Hua |
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| Affiliation: | YANG Jun-Lan~1 MA Yi-Tai~2 LI Min-Xia~2 TIAN Hua~2 (1.Department of Energy and Mechanical Engineering,Tianjin Institute of Urban Construction,Tianjin 300384,China,2.Thermal Energy Research Institute,Tianjin University,Tianjin 300072,China) |
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| Abstract: | In order to design a high-efficiency CO_2 evaporator,it is indispensable to investigate two-phase flow and boiling heat transfer characteristics in CO_2.By theoretical simulation,it is found that the critical gas-phase velocity for CO_2 liquid droplet entrainment is far smaller than that of the traditional refrigerants,and the CO_2 entrainment rate is higher than that of the traditional refrigerants.This shows that annular flow is the predominant flow pattern for CO_2 two-phase flow. The depression mass qua... |
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| Keywords: | carbon dioxide boiling heat transfer two-phase flow dry-out |
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