摘要
在常压条件下,对水平矩形通道内R113的流动沸腾换热过程进行了可视化实验研究.通过对加热平板上流动沸腾换热所形成的气泡形态的观测,发现随着热流密度的增大,流动沸腾的起沸点距离逐渐减小,并且减小的程度趋于平缓.随着热流密度的增大,气泡数量逐渐增多,且脱离速度也加快,气泡逐渐融合,直径逐渐变大.将本文的实验结果与文献中的对应结果进行对比,分析了流动沸腾换热中影响总体传热效果的主导因素由核态沸腾换热向强制对流换热转变。
Experimental investigation was carried out in the present study with high-speed video to study the flow boiling heat transfer performance of fluid in a rectangular channel. R113 was used as working fluid in this study. Through observation of the behavior of vapor bubbles generated on the heating surface, it was found that under conditions with the fluid mass flux fixed, the position of the onset of boiling moved gradually to the inlet of the duct as the heat flux increased, and the moving speed of the onset point reduced gradually. With the increase in heat flux, the number of the bubbles generated increases, and the escape velocity of the bubble expedites as well, and besides, the bubbles tend to merge, and the bubbles diameter enlarges. Based on a comparison of the experimental data in the present study with the empirical correlation, the main factors governing two phase flowing boiling heat transfer was analyzed.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第10期1697-1700,共4页
Journal of Engineering Thermophysics
基金
教育部高等学校博士学科点基金(No.20070698043)
国家重点基础研究发展计划(973计划)(No.2009CB219800)
关键词
流动沸腾
矩形通道
可视化
气泡
flow boiling
rectangular channel
visualization
bubble
