Critical heat flux (CHF) of subcooled flow boiling of alumina nanofluids in a horizontal microchannel / Saeid Vafaei in Journal of heat transfer, Vol. 132 N° 10 (Octobre 2010)  

Public ISBD [article]  inJournal of heat transfer > Vol. 132 N° 10 (Octobre 2010) . - pp. [102404/1-7] Titre : Critical heat flux (CHF) of subcooled flow boiling of alumina nanofluids in a horizontal microchannel Type de document : texte imprimé Auteurs : Saeid Vafaei, Auteur ; Dongsheng Wen, Auteur Année de publication : 2010 Article en page(s) : pp. [102404/1-7] Note générale : Physique Langues : Anglais (eng) Mots-clés : Flow boiling Microchannel Nanofluids Critical heat flux Burnout Index. décimale : 536 Chaleur. Thermodynamique Résumé : This work investigates subcooled flow boiling of aqueous based alumina nanofluids in 510 µm single microchannels with a focus on the effect of nanoparticles on the critical heat flux. The surface temperature distribution along the pipe, the inlet and outlet pressures and temperatures are measured simultaneously for different concentrations of alumina nanofluids and de-ionized water. To minimize the effect of nanoparticle depositions, all nanofluid experiments are performed on fresh microchannels. The experiment shows an increase of ~51% in the critical heat flux under very low nanoparticle concentrations (0.1 vol %). Different burnout characteristics are observed between water and nanofluids, as well as different pressure and temperature fluctuations and flow pattern development during the stable boiling period. Detailed observations of the boiling surface show that nanoparticle deposition and a subsequent modification of the boiling surface are common features associated with nanofluids, which should be responsible for the different boiling behaviors of nanofluids. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Critical heat flux (CHF) of subcooled flow boiling of alumina nanofluids in a horizontal microchannel [texte imprimé] / Saeid Vafaei, Auteur ; Dongsheng Wen, Auteur . - 2010 . - pp. [102404/1-7]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 10 (Octobre 2010) . - pp. [102404/1-7] Mots-clés : Flow boiling Microchannel Nanofluids Critical heat flux Burnout Index. décimale : 536 Chaleur. Thermodynamique Résumé : This work investigates subcooled flow boiling of aqueous based alumina nanofluids in 510 µm single microchannels with a focus on the effect of nanoparticles on the critical heat flux. The surface temperature distribution along the pipe, the inlet and outlet pressures and temperatures are measured simultaneously for different concentrations of alumina nanofluids and de-ionized water. To minimize the effect of nanoparticle depositions, all nanofluid experiments are performed on fresh microchannels. The experiment shows an increase of ~51% in the critical heat flux under very low nanoparticle concentrations (0.1 vol %). Different burnout characteristics are observed between water and nanofluids, as well as different pressure and temperature fluctuations and flow pattern development during the stable boiling period. Detailed observations of the boiling surface show that nanoparticle deposition and a subsequent modification of the boiling surface are common features associated with nanofluids, which should be responsible for the different boiling behaviors of nanofluids. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

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