质量流速对R134a流动沸腾起始点及壁温特性的影响

doi:10.6040/j.issn.1672-3961.0.2015.288

山东大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (3): 117-122.doi: 10.6040/j.issn.1672-3961.0.2015.288

• • 上一篇

质量流速对R134a流动沸腾起始点及壁温特性的影响

逯国强^1,2,韩吉田^1*,孔令健¹,陈常念¹,胡桂秋²,陈军²,李江飞²

1. 山东大学能源与动力工程学院, 山东济南 250061; 2. 承德石油高等专科学校热能工程系, 河北承德 067000

收稿日期:2015-09-02 出版日期:2016-06-30 发布日期:2015-09-02
通讯作者: 韩吉田(1961— ),男,山东莱阳人,教授,博士,博导,主要研究方向为两相流与传热,分布式供能.E-mail: jthan@sdu.edu.cn E-mail:lugqsd@163.com
作者简介:逯国强(1985— ),男,山东泰安人,助教,硕士,主要研究方向为制冷剂流动沸腾换热与通风技术.E-mail: lugqsd@163.com
基金资助:
国家自然科学基金资助项目(51076084)

Effect of mass flux on onset of nucleate flow boiling of R134a and tube wall temperature characteristics

LU Guoqiang^{1, 2}, HAN Jitian^1*, KONG Lingjian¹, CHEN Changnian¹, HU Guiqiu², CHEN Jun², LI Jiangfei²

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
2. Department of Thermal Engineering, Chengde Petroleum College, Chengde 067000, Hebei, China

Received:2015-09-02 Online:2016-06-30 Published:2015-09-02

摘要/Abstract

摘要： 为了得到螺旋管内流体流动沸腾起始点及管子壁温分布的特性,以R134a为工质进行试验。通过观察逐渐增大热流密度时壁温的变化情况判断沸腾的起始点。研究结果表明,沸腾起始点的热流密度随工质质量流速的增大而增大,但由于质量流速、离心力、重力等对汽泡粘附和脱离行为的综合影响,在某些位置会出现与该趋势不同的情况;在单相对流换热阶段,选定点的壁温随质量流速的增大而降低,而在流动沸腾换热阶段,质量流速对壁温变化的影响较小。研究结果可望为螺旋管式换热器的可靠设计和安全运行提供参考依据。

关键词: 壁温, 汽泡行为, 机理, 沸腾起始点, 质量流速

Abstract: In order to obtain the characteristics of onset of nucleate flow boiling(ONB)and tube wall temperature distributions in helically-coiled tube, an experiment was conducted with the working medium R134a. The ONB was determined by observing the wall temperature changes when the heat flux was increased gradually. Analysis of the experimental results was performed to reveal the related mechanism. The results indicated that the heat flux of ONB increased with increase in the mass flux of R134a, however, the mass flux, centrifugal and gravity forces had different influences on the bubble behavior of detaching and reattaching in some cases, resulting in different trends in some positions measured in the experiment. In single-phase, the wall temperatures in the selected points decreased with increase in the mass flux of R134a; under flow boiling conditions, the increase in the mass flux only resulted in a slight change in the tube wall temperatures. The experimental results can provide a reference for the reliable design and safe operation of helically-coiled tube heat exchangers.

Key words: onset of nucleate flow boiling, mass flux, bubble behavior, mechanism, wall temperature

中图分类号:

TK124

逯国强,韩吉田,孔令健,陈常念,胡桂秋,陈军,李江飞. 质量流速对R134a流动沸腾起始点及壁温特性的影响[J]. 山东大学学报(工学版), 2016, 46(3): 117-122.

LU Guoqiang, HAN Jitian, KONG Lingjian, CHEN Changnian, HU Guiqiu, CHEN Jun, LI Jiangfei. Effect of mass flux on onset of nucleate flow boiling of R134a and tube wall temperature characteristics[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2016, 46(3): 117-122.

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质量流速对R134a流动沸腾起始点及壁温特性的影响

Effect of mass flux on onset of nucleate flow boiling of R134a and tube wall temperature characteristics

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