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Titre :
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Flow boiling heat transfer on micro pin fins entrenched in a microchannel
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Auteurs :
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Santosh Krishnamurthy, Auteur ;
Yoav Peles, 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° 4 (n° spécial), Avril 2010)
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Article en page(s) :
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pp. [041007-1/10]
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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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Micro pin fins Heat transfer coefficient Flow maps
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Résumé :
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Flow boiling of 1-methoxyheptafluoropropane (HFE 7000) in 222 µm hydraulic diameter channels containing a single row of 24 inline 100 µm pin fins was studied for mass fluxes from 350 kg/m2 s to 827 kg/m2 s and wall heat fluxes from 10 W/cm2 to 110 W/cm2. Flow visualization revealed the existence of isolated bubbles, bubbles interacting, multiple flow, and annular flow. The observed flow patterns were mapped as a function of the boiling number and the normalized axial distance. The local heat transfer coefficient during subcooled boiling was measured and found to be considerably higher than the corresponding single-phase flow. Furthermore, a thermal performance evaluation comparison with a plain microchannel revealed that the presence of pin fins considerably enhanced the heat transfer coefficient.
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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=4&OUTLOG=NO&sti=yes&viewabs=JHTRAO&key=D
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