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contributor authorRishi Raj
contributor authorJohn McQuillen
contributor authorJungho Kim
date accessioned2017-05-09T00:33:37Z
date available2017-05-09T00:33:37Z
date copyrightSeptember, 2009
date issued2009
identifier issn0022-1481
identifier otherJHTRAO-27870#091502_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/140973
description abstractVirtually all data to date regarding parametric effects of gravity on pool boiling have been inferred from experiments performed in low-g, 1g, or 1.8g conditions. The current work is based on observations of boiling heat transfer obtained over a continuous range of gravity levels (0g–1.8g) under subcooled liquid conditions (n-perfluorohexane, ΔTsub=26°C, and 1 atm), two gas concentrations (220 ppm and 1216 ppm), and three heater sizes (full heater-7×7 mm2, half heater-7×3.5 mm2, and quarter heater-3.5×3.5 mm2). As the gravity level changed, a sharp transition in the heat transfer mechanism was observed at a threshold gravity level. Below this threshold (low-g regime), a nondeparting primary bubble governed the heat transfer and the effect of residual gravity was small. Above this threshold (high-g regime), bubble growth and departure dominated the heat transfer and gravity effects became more important. An increase in noncondensable dissolved gas concentration shifted the threshold gravity level to lower accelerations. Heat flux was found to be heater size dependent only in the low-g regime.
publisherThe American Society of Mechanical Engineers (ASME)
titleSubcooled Pool Boiling in Variable Gravity Environments
typeJournal Paper
journal volume131
journal issue9
journal titleJournal of Heat Transfer
identifier doi10.1115/1.3122782
journal fristpage91502
identifier eissn1528-8943
keywordsHeat transfer
keywordsBubbles
keywordsGravity (Force)
keywordsHeat flux
keywordsBoiling
keywordsSubcooling
keywordsPool boiling AND Temperature
treeJournal of Heat Transfer:;2009:;volume( 131 ):;issue: 009
contenttypeFulltext


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