CO2微细通道流动沸腾换热干涸特性

doi:10.11949/j.issn.0438-1157.20141500

化工学报 ›› 2015, Vol. 66 ›› Issue (5): 1676-1682.DOI: 10.11949/j.issn.0438-1157.20141500

CO₂微细通道流动沸腾换热干涸特性

吴昊, 柳建华, 张良, 姜林林, 丁杨, 梁亚英

上海理工大学制冷技术研究所, 上海 200093

收稿日期:2014-10-07 修回日期:2015-01-20 出版日期:2015-05-05 发布日期:2015-05-05
通讯作者: 柳建华
基金资助:
高等学校博士学科点专项科研基金(2009320110003);上海市重点学科建设项目(S30503);上海市研究生创新基金项目(JWCXSL0901)。

Characteristics of dryout for CO₂ flow boiling heat transfer in mini-channels

WU Hao, LIU Jianhua, ZHANG Liang, JIANG Linlin, DING Yang, LIANG Yaying

Refrigeration Technology Institute, University of Shanghai for Science and Technology, Shanghai 200093, China

Received:2014-10-07 Revised:2015-01-20 Online:2015-05-05 Published:2015-05-05
Supported by:
supported by the Research Fund for the Doctoral Program of Higher Education of China(2009320110003), Shanghai Leading Academic Discipline Project (S30503) and the Innovation Fund Project for Graduate Student of Shanghai (JWCXSL0901).

摘要/Abstract

摘要： 针对二氧化碳作为制冷剂在微细通道内两相流沸腾换热进行了实验与理论研究,采用红外成像观测与传热系数实验研究,定量与定性地分析了热通量2～35 kW·m^-2,饱和温度-10～10℃工况时,内径为1、2、3 mm圆管内的传热系数。实验结果表明:当质量流率增加时干涸起始干度逐渐降低,当质量流率小于临界值时,干涸现象结束之后,传热系数随着质量流率增加基本维持不变,而当质量流率大于临界值时,干涸现象结束之后,随着质量流率增加传热系数相应增加;随着管径增加,干涸发生的质量流率越小,临界热通量越大,同时管径越小传热系数越高。

关键词: 二氧化碳, 微细通道, 两相流, 成像, 干涸

Abstract: Experimental and theoretical researches were conducted to get the two-phase flow boiling heat transfer characteristics of carbon dioxide as refrigerant in horizontal mini-channels. Based on infrared thermal imaging tests and experimental study on heat transfer coefficients, heat transfer coefficients of carbon dioxide were analyzed qualitatively and quantitatively under following experimental conditions: heat flux 2—35 kW·m^-2, saturation temperature -10—15℃, mini-channels inner diameter:1 mm, 2 mm or 3 mm. With the increase of mass flow rate, the value of vapor quality decreased gradually when dryout happened. When mass flow rate was below a critical value, heat transfer coefficient almost kept constant with the increase of mass flow rate after dryout. When mass flow rate was above the critical value, heat transfer coefficient gradually increased with the increase of mass flow rate after dryout. With the increase of tube diameter, mass flow rate decreased and the critical value of heat flux increased when dryout happened. With the decrease of tube diameter, coefficient of heat transfer increased.

Key words: carbon dioxide, mini-channels, two-phase flow, imaging, dryout

中图分类号:

吴昊, 柳建华, 张良, 姜林林, 丁杨, 梁亚英. CO₂微细通道流动沸腾换热干涸特性[J]. 化工学报, 2015, 66(5): 1676-1682.

WU Hao, LIU Jianhua, ZHANG Liang, JIANG Linlin, DING Yang, LIANG Yaying. Characteristics of dryout for CO₂ flow boiling heat transfer in mini-channels[J]. CIESC Journal, 2015, 66(5): 1676-1682.

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CO₂微细通道流动沸腾换热干涸特性

Characteristics of dryout for CO₂ flow boiling heat transfer in mini-channels

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