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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= [...]

Visible-light-induced photocatalyst based on nickel titanate nanoparticles / Xin Shu in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4750–4753 Titre : Visible-light-induced photocatalyst based on nickel titanate nanoparticles Type de document : texte imprimé Auteurs : Xin Shu, Auteur ; Jing He, Auteur ; Dong Chen, Auteur Année de publication : 2008 Article en page(s) : p. 4750–4753 Note générale : Bibliogr. p. 4752-4753 Langues : Anglais (eng) Mots-clés : Crystalline  structure;  TiO2;  NiTiO3;  Photocatalytic  activities Résumé : TiO2-coupled NiTiO3 nanoparticles have been prepared by coprecipitation in aqueous medium followed by sintering. Powder X-ray diffraction (PXRD) and high-resolution transmission electron microscopy (HRTEM) were used to characterize the crystalline structure. The crystalline sizes of both TiO2 and NiTiO3 were estimated to be in the range of 40−50 nm. A noticeable optical absorbance in the visible range was observed by UV−vis diffuse reflection spectroscopy (DRS). The photocatalytic activities were evaluated in the degradation of methylene blue in aqueous solution. The results show that the TiO2-coupled NiTiO3 nanoparticles exhibit good photocatalytic activities under visible light irradiation. The NiTiO3 phase was found to be indispensable for photoabsorption and photocatalysis. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071619d [article] Visible-light-induced photocatalyst based on nickel titanate nanoparticles [texte imprimé] / Xin Shu, Auteur ; Jing He, Auteur ; Dong Chen, Auteur . - 2008 . - p. 4750–4753. Bibliogr. p. 4752-4753 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4750–4753 Mots-clés : Crystalline  structure;  TiO2;  NiTiO3;  Photocatalytic  activities Résumé : TiO2-coupled NiTiO3 nanoparticles have been prepared by coprecipitation in aqueous medium followed by sintering. Powder X-ray diffraction (PXRD) and high-resolution transmission electron microscopy (HRTEM) were used to characterize the crystalline structure. The crystalline sizes of both TiO2 and NiTiO3 were estimated to be in the range of 40−50 nm. A noticeable optical absorbance in the visible range was observed by UV−vis diffuse reflection spectroscopy (DRS). The photocatalytic activities were evaluated in the degradation of methylene blue in aqueous solution. The results show that the TiO2-coupled NiTiO3 nanoparticles exhibit good photocatalytic activities under visible light irradiation. The NiTiO3 phase was found to be indispensable for photoabsorption and photocatalysis. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071619d