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Titre :
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Heater size and gravity based pool boiling regime map : transition criteria between buoyancy and surface tension dominated boiling
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Auteurs :
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Rishi Raj, Auteur ;
Jungho Kim, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Journal of heat transfer (Vol. 132 N° 9, Septembre 2010)
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Article en page(s) :
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pp. [091503-1/10]
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Note générale :
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Physique
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Langues :
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Anglais
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Index. décimale :
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536 (Chaleur. Thermodynamique)
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Tags :
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Pool boiling Capillary length Heater size Gravity Surface tension Buoyancy Regime map
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Résumé :
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A pool boiling regime map demarcating the boundary between the surface tension and buoyancy dominated boiling regimes is developed based on heater size and gravity. For large heaters and/or high gravity conditions, boiling is dominated by buoyancy, and the ebullition cycle dominates the contribution to heat transfer. As the gravity level and/or heater size is decreased, surface tension forces become increasingly dominant, and a decrease in heat transfer is observed. The ratio of the heater size Lh (length of a side for a square heater) to the capillary length Lc is found to be a suitable parameter to define the transition criterion between these regimes. Based on the data obtained using FC-72 and pentane, the threshold value of Lh/Lc above which pool boiling is buoyancy dominated was found to be about 2.1. This transition criterion was found to be the same for gravity levels between ~0g–1.7g and liquid subcoolings between 6.6°C and 26.6°C.
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DEWEY :
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536
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ISSN :
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0022-1481
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En ligne :
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http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode=strresults&sort=chron&maxdisp=25&threshold=0&pjournals=JHTRAO&pyears=2010&possible1zone=article&fromyear=2010&fromvolume=132&fromissue=9&OUTLOG=NO&sti=yes&viewabs=JHTRAO&key=D
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