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Critical Heat Flux in Pool Boiling on Metal-Graphite Composite SurfacesA study is conducted on high heat-flux pool boiling of pentane on micro-configured composite surfaces. The boiling surfaces are copper-graphite (Cu-Gr) and aluminum-graphite (Al-Gr) composites with a fiber volume concentration of 50%. The micro-graphite fibers embedded in the matrix contribute to a substantial enhancement in boiling heat-transfer performance. Correlation equations are obtained for both the isolated and coalesced bubble regimes, utilizing a mathematical model based on a metal-graphite, two-tier configuration with the aid of experimental data. A new model to predict the critical heat flux (CHF) on the composites is proposed to explain the fundamental aspects of the boiling phenomena. Three different factors affecting the CHF are considered in the model. Two of them are expected to become the main agents driving vapor volume detachment under microgravity conditions, using the metal-graphite composite surfaces as the heating surface and using liquids with an unusual Marangoni effect as the working fluid.
Document ID
20000056863
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Zhang, Nengli (Ohio Aerospace Inst. Cleveland, OH United States)
Yang, Wen-Jei (Michigan Univ. Ann Arbor, MI United States)
Chao, David F. (NASA Glenn Research Center Cleveland, OH United States)
Chao, David F.
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: 34th National Heat Transfer Conference
Location: Pittsburgh, PA
Country: United States
Start Date: August 20, 2000
End Date: August 22, 2000
Sponsors: American Society of Mechanical Engineers
Funding Number(s)
CONTRACT_GRANT: NCC3-620
PROJECT: RTOP 101-13-0A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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