Pool boiling heat transfer of ultra-light copper foam with open cells

Technology Science & Technology SURFACE FC-72 MIXTURES Copper Foam Pool Boiling Mechanics Cage Bubble 01 natural sciences Boiling Pattern TRANSFER ENHANCEMENT 620 0104 chemical sciences Boiling Curve VISUALIZATION
DOI: 10.1016/j.ijmultiphaseflow.2008.05.003 Publication Date: 2008-06-07T09:01:46Z
ABSTRACT
High speed visualizations and thermal performance studies of pool boiling heat transfer on copper foam covers were performed at atmospheric pressure, with the heating surface area of 12.0 mm by 12.0 mm, using acetone as the working fluid. The foam covers have ppi (pores per inch) from 30 to 90, cover thickness from 2.0 to 5.0 mm, and porosity of 0.88 and 0.95. The surface superheats are from -20 to 190 K, and the heat fluxes reach 140 W/cm(2). The 30 and 60 ppi foam covers show the periodic single bubble generation and departure pattern at low surface superheats. With continuous increases in surface superheats, they show the periodic bubble coalescence and/or re-coalescence pattern. Cage bubbles were observed to be those with liquid filled inside and vented to the pool liquid. For the 90 ppi foam covers, the bubble coalescence takes place at low surface superheats. At moderate or large surface superheats, vapor fragments continuously escape to the pool liquid.
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