NDLI: Bubble departure from metal-graphite composite surfaces and its effects on pool boiling heat transfer

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Bubble departure from metal-graphite composite surfaces and its effects on pool boiling heat transfer

Content Provider	NASA Technical Reports Server (NTRS)
Author	Chao, David F. Sankovic, John M. Yang, W-J Motil, Brian J. Zhang, Nengli
Copyright Year	2010
Description	The formation and growth processes of a bubble in the vicinity of graphite micro-fiber tips on metal-graphite composite boiling surfaces and their effects on boiling behavior are investigated. It is discovered that a large number of micro bubbles are formed first at the micro scratches and cavities on the metal matrix in pool boiling. By virtue of the non-wetting property of graphite, once the growing micro bubbles touch the graphite tips, the micro bubbles are sucked by the tips and merged into larger micro bubbles sitting on the end of the tips. The micro bubbles grow rapidly and coalesce to form macro bubbles, each spanning several tips. The necking process of a detaching macro bubble is analyzed. It is revealed that a liquid jet is produced by sudden break-off of the bubble throat. The composite surfaces not only have higher temperatures in micro- and macrolayers but also make higher frequency of the bubble departure, which increase the average heat fluxes in both the bubble growth stage and in the bubble departure period. Based on these analyses, the enhancement mechanism of pool boiling heat transfer on composite surfaces is clearly revealed.
File Size	554453
Page Count	11
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110016115
Archival Resource Key	ark:/13960/t2z36sx3d
Language	English
Publisher Date	2010-01-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Coalescing Thickness Bubbles Composite Materials Metal Surfaces Microfibers Photomicrographs Graphite Evaporation Boiling Heat Transfer Heat Flux Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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