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	Jet flows from bubbles during subcooled pool boiling on micro wires
	Wang, H ; Christopher, DM ; Peng, XF ; Wang, BX
	2010-05-11 ; 2010-05-11
关键词	subcooled boiling bubble multi-jet jet flow PIV Marangoni CFD HEAT-TRANSFER Engineering, Multidisciplinary Materials Science, Multidisciplinary
中文摘要	An experimental investigation was conducted on subcooled nucleate boiling on ultra-small wires having diameters of 25-100 mu m. High-speed photography and laser PIV (Particle Image Velocimetry) technology were used to visually observe the bubble dynamics. For highly subcooled boiling at moderate heat fluxes, the bubbles generally remained attached to the micro heating wires and bubble-top jet flows were clearly observed. Smaller bubbles usually had stronger bubble-top jet flows, while larger bubbles seemed to produce multi-jet flows. The structures of the bubble-top jet flows, as well as multi-jet flows, were proposed from the experimental observation. A model was developed to describe jet flow phenomena from bubbles on micro wires. Numerical simulations for bubbles having diameter of 0.03 and 0.06 mm showed that both the bubble-top and multi-jet flows were induced by a strong Marangoni effect due to high temperature gradients near the wire. The predicted velocity magnitudes and flow structures agreed very well with experimental measurements. The bubble size relative to the wire is an important factor affecting the jet flow structure. For a 0.03 mm bubble on a 0.1 mm wire, only a bubble-top jet flow forms, while a complex multi-jet flow pattern forms around the bubble with a weak bubble-top jet and two side jet flows for a 0.06 mm bubble.
语种	英语 ; 英语
出版者	SCIENCE PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25829]
专题	清华大学
推荐引用方式 GB/T 7714	Wang, H,Christopher, DM,Peng, XF,et al. Jet flows from bubbles during subcooled pool boiling on micro wires[J],2010, 2010.
APA	Wang, H,Christopher, DM,Peng, XF,&Wang, BX.(2010).Jet flows from bubbles during subcooled pool boiling on micro wires..
MLA	Wang, H,et al."Jet flows from bubbles during subcooled pool boiling on micro wires".(2010).

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