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Investigation on intertube falling-film Heat transfer and mode transitions of aqueous-alumina nanofluids / Binglu Ruan in Journal of heat transfer, Vol. 133 N° 5 (Mai 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 5 (Mai 2011) . - pp. [051501/1-11] Titre : Investigation on intertube falling-film Heat transfer and mode transitions of aqueous-alumina nanofluids Type de document : texte imprimé Auteurs : Binglu Ruan, Auteur ; Anthony M. Jacobi, Auteur Année de publication : 2011 Article en page(s) : pp. [051501/1-11] Note générale : Physique Langues : Anglais (eng) Mots-clés : Falling-film  Heat  transfer  Nanofluids  Lode  transition  Thermal  conductivity  Viscosity  Surface  tension Index. décimale : 536 Chaleur. Thermodynamique Résumé : Horizontal-tube falling-film heat transfer characteristics of aqueous aluminum oxide nanofluids at concentrations of 0 vol %, 0.05 vol % (0.20 wt %), 0.5 vol % (1.96 wt %), 1 vol % (3.86 wt %) (with and without sodium dodecylbenzene sulfonate), and 2 vol % (7.51 wt %) are investigated and compared with predictions developed for conventional fluids. The thermophysical properties of the nanofluids, including thermal conductivity, kinematic viscosity, and surface tension, are reported, as is the mode transition behavior of the nanofluids. The experimental results for heat transfer are in good agreement with predictions for falling-film flow and no unusual Nu enhancement was observed in the present studies. Additionally, a 20% mode transitional Reynolds number increase was recorded for transitions between sheets and jets and jet-droplet mode to droplet mode. Although the findings with water-alumina nanofluids are not encouraging with respect to heat transfer, the results extend nanofluid data to a new type of flow and may help improve our understanding of nanofluid behavior. Moreover, this work provides a basis for further work on falling-film nanofluids. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] Investigation on intertube falling-film Heat transfer and mode transitions of aqueous-alumina nanofluids [texte imprimé] / Binglu Ruan, Auteur ; Anthony M. Jacobi, Auteur . - 2011 . - pp. [051501/1-11]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 5 (Mai 2011) . - pp. [051501/1-11] Mots-clés : Falling-film  Heat  transfer  Nanofluids  Lode  transition  Thermal  conductivity  Viscosity  Surface  tension Index. décimale : 536 Chaleur. Thermodynamique Résumé : Horizontal-tube falling-film heat transfer characteristics of aqueous aluminum oxide nanofluids at concentrations of 0 vol %, 0.05 vol % (0.20 wt %), 0.5 vol % (1.96 wt %), 1 vol % (3.86 wt %) (with and without sodium dodecylbenzene sulfonate), and 2 vol % (7.51 wt %) are investigated and compared with predictions developed for conventional fluids. The thermophysical properties of the nanofluids, including thermal conductivity, kinematic viscosity, and surface tension, are reported, as is the mode transition behavior of the nanofluids. The experimental results for heat transfer are in good agreement with predictions for falling-film flow and no unusual Nu enhancement was observed in the present studies. Additionally, a 20% mode transitional Reynolds number increase was recorded for transitions between sheets and jets and jet-droplet mode to droplet mode. Although the findings with water-alumina nanofluids are not encouraging with respect to heat transfer, the results extend nanofluid data to a new type of flow and may help improve our understanding of nanofluid behavior. Moreover, this work provides a basis for further work on falling-film nanofluids. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...]

Numerical and experimental investigation of laminar channel flow with a transparent wall / Jing He in Journal of heat transfer, Vol. 133 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [061701/1-9] Titre : Numerical and experimental investigation of laminar channel flow with a transparent wall Type de document : texte imprimé Auteurs : Jing He, Auteur ; Liping Liu, Auteur ; Anthony M. Jacobi, Auteur Année de publication : 2011 Article en page(s) : pp. [061701/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Laminar  channel  flow  Conjugate  heat  transfer  Transparent  wall  Infrared  thermography Index. décimale : 536 Chaleur. Thermodynamique Résumé : A numerical and experimental investigation is undertaken for developing laminar flow in a duct with one opaque, uniformly heated wall and one transparent wall. In the numerical model, mixed convection, radiative exchange, as well as two-dimensional conduction in the substrate are considered. Experiments are conducted in a high-aspect-ratio rectangular channel using infrared thermography to validate the numerical model and visualize the temperature field on a heated surface. An extended parametric study using the validated model is also carried out to assess the impact of channel height, and thermal conductivity and thickness of the substrate. For a channel height of H=6 mm and a heating power of qs=257 W/m2, as Re increases from 150 to 940 the fraction of heat transfer by convection from the heated surface rises from 65% to 79%. At Re=150, as H increases from 6 mm to 25 mm, radiation from the heated surface increases from 35% to 70% of the total heating power. The influence of substrate conductivity and thickness on local flux distributions is limited to regions near the channel inlet and outlet. Over the entire parametric space considered, radiation loss from the interior duct surfaces to the inlet and outlet apertures is less than 2% of the total heat input and thus unimportant. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Numerical and experimental investigation of laminar channel flow with a transparent wall [texte imprimé] / Jing He, Auteur ; Liping Liu, Auteur ; Anthony M. Jacobi, Auteur . - 2011 . - pp. [061701/1-9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [061701/1-9] Mots-clés : Laminar  channel  flow  Conjugate  heat  transfer  Transparent  wall  Infrared  thermography Index. décimale : 536 Chaleur. Thermodynamique Résumé : A numerical and experimental investigation is undertaken for developing laminar flow in a duct with one opaque, uniformly heated wall and one transparent wall. In the numerical model, mixed convection, radiative exchange, as well as two-dimensional conduction in the substrate are considered. Experiments are conducted in a high-aspect-ratio rectangular channel using infrared thermography to validate the numerical model and visualize the temperature field on a heated surface. An extended parametric study using the validated model is also carried out to assess the impact of channel height, and thermal conductivity and thickness of the substrate. For a channel height of H=6 mm and a heating power of qs=257 W/m2, as Re increases from 150 to 940 the fraction of heat transfer by convection from the heated surface rises from 65% to 79%. At Re=150, as H increases from 6 mm to 25 mm, radiation from the heated surface increases from 35% to 70% of the total heating power. The influence of substrate conductivity and thickness on local flux distributions is limited to regions near the channel inlet and outlet. Over the entire parametric space considered, radiation loss from the interior duct surfaces to the inlet and outlet apertures is less than 2% of the total heat input and thus unimportant. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]