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Flow boiling heat transfer on micro pin fins entrenched in a microchannel / Santosh Krishnamurthy in Journal of heat transfer, Vol. 132 N° 4 (n° spécial) (Avril 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041007-1/10] Titre : Flow boiling heat transfer on micro pin fins entrenched in a microchannel Type de document : texte imprimé Auteurs : Santosh Krishnamurthy, Auteur ; Yoav Peles, Auteur Article en page(s) : pp. [041007-1/10] Note générale : Physique Langues : Anglais (eng) Mots-clés : Micro  pin  fins  Heat  transfer  coefficient  Flow  maps Index. décimale : 536 Chaleur. Thermodynamique Résumé : 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. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Flow boiling heat transfer on micro pin fins entrenched in a microchannel [texte imprimé] / Santosh Krishnamurthy, Auteur ; Yoav Peles, Auteur . - pp. [041007-1/10]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041007-1/10] Mots-clés : Micro  pin  fins  Heat  transfer  coefficient  Flow  maps Index. décimale : 536 Chaleur. Thermodynamique Résumé : 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. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

Flow boiling on micropin fins entrenched inside a microchannel—flow patterns and bubble departure diameter and bubble frequency / Santosh Krishnamurthy in Journal of heat transfer, Vol. 132 N° 4 (n° spécial) (Avril 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041002-1/9] Titre : Flow boiling on micropin fins entrenched inside a microchannel—flow patterns and bubble departure diameter and bubble frequency Type de document : texte imprimé Auteurs : Santosh Krishnamurthy, Auteur ; Yoav Peles, Auteur Article en page(s) : pp. [041002-1/9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Flow  boiling  Microchannel  Micro-pin  fin  Bubble  departure  frequency  Bubble  departure  diameter  Surface  tension Index. décimale : 536 Chaleur. Thermodynamique Résumé : Flow boiling of HFE 7000 in five parallel microchannels of 222 µm hydraulic diameter, each containing a single row of 24 in-line 100 µm pin fins, was investigated. High speed photography revealed the dominant flow patterns, namely, the bubbly flow, the multiple flow, and the wavy-annular flow. The interaction of the bubble with the pin fins during nucleate boiling from G=350 kg/m2 s to G=827 kg/m2 s and wall heat fluxes from 10 W/cm2 to 110 W/cm2 is detailed. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Flow boiling on micropin fins entrenched inside a microchannel—flow patterns and bubble departure diameter and bubble frequency [texte imprimé] / Santosh Krishnamurthy, Auteur ; Yoav Peles, Auteur . - pp. [041002-1/9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041002-1/9] Mots-clés : Flow  boiling  Microchannel  Micro-pin  fin  Bubble  departure  frequency  Bubble  departure  diameter  Surface  tension Index. décimale : 536 Chaleur. Thermodynamique Résumé : Flow boiling of HFE 7000 in five parallel microchannels of 222 µm hydraulic diameter, each containing a single row of 24 in-line 100 µm pin fins, was investigated. High speed photography revealed the dominant flow patterns, namely, the bubbly flow, the multiple flow, and the wavy-annular flow. The interaction of the bubble with the pin fins during nucleate boiling from G=350 kg/m2 s to G=827 kg/m2 s and wall heat fluxes from 10 W/cm2 to 110 W/cm2 is detailed. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]