竖直矩形窄缝通道滑移汽泡聚合作用可视化实验研究

徐建军; 陈炳德; 王小军

doi:10.7538/yzk.2011.45.05.0548

竖直矩形窄缝通道滑移汽泡聚合作用可视化实验研究

中国核动力研究设计院空泡物理和自然循环重点实验室,四川成都610041

计量
- 文章访问数: 612
- HTML全文浏览量: 0
- PDF下载量: 1055
出版历程
- 收稿日期: 1899-12-31
- 修回日期: 1899-12-31
- 刊出日期: 2011-05-19

Experimental Visualization Coalesced Interaction of Sliding Bubble Near Wall in Vertical Narrow Rectangular Channel

Key Laboratory of Bubble Physics & Natural Circulation, Nuclear Power Institute of China, Chengdu 610041, China

摘要

摘要: 采用高速摄像仪从宽面和窄面立体可视化观察了滑移汽泡间的聚合特性。研究结果表明，在低热流密度孤立汽泡区域，近壁滑移汽泡间的聚合作用过程较快，聚合重新形成的汽泡仍沿加热面平行滑移；在滑移汽泡间开始相互作用的影响距离约是其平均直径的2倍，滑移汽泡间的聚合作用是一种积极的作用，共同使得滑移汽泡的运动速度增加，有利于该区域附近换热的提高。最后探讨了核化生长汽泡间的作用及其对汽泡浮升的影响。
- 滑移汽泡 ,
- 聚合作用 ,
- 窄缝
Abstract: The characteristic of the coalesced sliding bubble was visually observed by wide side and narrow side of the narrow rectangular channel using high speed digital camera. The results show that the coalesced time among the sliding bubbles is quick, and the new formation of coalesced bubble is not lift-off, and it continues to slide along the heated surface in low heat flux for the isolated bubble region. The influence region is about 2 times projected area of the sliding bubble when the sliding bubbles begin to interact. The sliding bubble velocities increase duo to the interaction among the bubbles, which contributes to enhance heat transfer of this region. Finally， the effect of coalesced interaction of growing bubble in the nucleation sites on bubble lift-off was discussed and analysed.
- sliding bubble ,
- coalesced interaction ,
- narrow channel

HTML全文

参考文献(11)

[1]	柴立和，彭晓峰，王补宣. 池沸腾传热基础理论新视角探索[J]. 应用基础与工程科学学报，1999,7(1):74-80. CHAI Lihe, PENG Xiaofeng, WANG Buxuan. New perspective on fundamental theory of pool boiling heat transfer[J]. J Basic Sci Eng, 1999, 7(1): 74-80(in Chinese).
[2]	KENNING D B, BUSTNES O E. Liquid crystal study of sliding vapour bubbles[J]. Heat and Mass Transfer, 2009, 45(7): 867-880.
[3]	NITESH D N, SUSHIL H B, RICHARD C J. Effect of nucleation site spacing on the pool boiling characteristics of a structured surface[J]. Int J Heat Mass Transfer, 2006, 49(17-18): 2 829-2 839.
[4]	ERICH H, GERRIT B. Heat transfer and nucleation in pool-boiling[J]. International Journal of Thermal Sciences, 2006, 45(3): 209-216.
[5]	BENJAMIN R J, BALAKRISHNAN A R. Nucleation site density in pool boiling of saturated pure liquids: Effect of surface microroughness and surface and liquid physical properties[J]. Exp Therm Fluid Sci, 1997, 15(1): 32-42.
[6]	徐建军，何军山，陈炳德，等. 矩形窄缝流道内过冷沸腾汽泡行为的可视化[J]. 动力工程，2007，27（3）：389-392. XU Jianjun, HE Junshan, CHEN Bingde, et al. Visualization of subcooled boiling bubble behaviors in a narrow rectangular channel[J]. Power Engineering, 2007， 27（3）：389-392(in Chinese).
[7]	徐建军，陈炳德，王小军，等. 矩形窄缝流道内窄边近壁面汽泡运动现象及分析[J]. 化学工程，2007，35（8）：22-24. XU Jianjun, CHEN Bingde, WANG Xiaojun, et al. Phenomenon and analysis of motive bubbles near the wall in a rectangular narrow channel[J]. Chemical Engineering, 2007， 35（8）：22-24(in Chinese).
[8]	THORNCROFT G E, KLAUSNER J F, MEI R. An experimental investigation of bubble growth and detachment in vertical upflow and downflow boiling[J]. Int J Heat Mass Transfer, 1998, 41(23): 3 857-3 871.
[9]	THORNCROFT G E, KLAUSNER J F. The Influence of vapor bubble sliding on forced convection boiling heat transfer[J]. Journal of Heat Transfer, 1999, 121(1): 73-79.
[10]	QIU D, DHIR V K. Experimental study of flow pattern and heat transfer associated with a bubble sliding on downward facing inclined surface[J]. Exp Therm Fluid Sci, 2002, 26(6-7): 605-616.
[11]	BAYAZIT B B, HOLLINGSWORTH K, WITTE L C. Heat transfer enhancement caused by sliding bubbles[J]. Journal of Heat Transfer, 2003, 125(3): 503-509.

施引文献

资源附件(0)

计量

文章访问数: 612
HTML全文浏览量: 0
PDF下载量: 1055
被引次数: 0

竖直矩形窄缝通道滑移汽泡聚合作用可视化实验研究

计量

出版历程

Experimental Visualization Coalesced Interaction of Sliding Bubble Near Wall in Vertical Narrow Rectangular Channel

计量

出版历程

目录