Documents disponibles écrits par cet auteur

Evaluation of compact and effective air-cooled carbon foam heat sink / W. Wu 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. [054504/1-5] Titre : Evaluation of compact and effective air-cooled carbon foam heat sink Type de document : texte imprimé Auteurs : W. Wu, Auteur ; J. H. Du, Auteur ; Y. R. Lin, Auteur Année de publication : 2011 Article en page(s) : pp. [054504/1-5] Note générale : Physique Langues : Anglais (eng) Mots-clés : Carbon  foam  Thermal  management  Electronics  cooling Index. décimale : 536 Chaleur. Thermodynamique Résumé : This study investigates a V-shaped corrugated carbon foam heat sink for thermal management of electronics with forced air convection. Experiments were conducted to determine the heat sink performance in terms of heat transfer coefficient and pressure drop. The test section, with overall dimensions of 51 mm L×51 mm W×19 mm H, enabled up to 166 W of heat dissipation, and 3280 W/m2 K and 2210 W/m2 K heat transfer coefficients, based on log mean and air inlet temperatures, respectively, at 7.8 m/s air flow speed, and 1320 Pa pressure loss. Compared to a solid carbon foam, the V-shaped corrugated structure enhances the heat transfer, and at the same time reduces the flow resistance. Physical mechanisms underlying the observed phenomena are briefly explained. With benefits that potentially can reduce overall weight, volume, and cost of the air-cooled electronics, the present V-shaped corrugated carbon foam emerges as an alternative heat sink. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Evaluation of compact and effective air-cooled carbon foam heat sink [texte imprimé] / W. Wu, Auteur ; J. H. Du, Auteur ; Y. R. Lin, Auteur . - 2011 . - pp. [054504/1-5]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 5 (Mai 2011) . - pp. [054504/1-5] Mots-clés : Carbon  foam  Thermal  management  Electronics  cooling Index. décimale : 536 Chaleur. Thermodynamique Résumé : This study investigates a V-shaped corrugated carbon foam heat sink for thermal management of electronics with forced air convection. Experiments were conducted to determine the heat sink performance in terms of heat transfer coefficient and pressure drop. The test section, with overall dimensions of 51 mm L×51 mm W×19 mm H, enabled up to 166 W of heat dissipation, and 3280 W/m2 K and 2210 W/m2 K heat transfer coefficients, based on log mean and air inlet temperatures, respectively, at 7.8 m/s air flow speed, and 1320 Pa pressure loss. Compared to a solid carbon foam, the V-shaped corrugated structure enhances the heat transfer, and at the same time reduces the flow resistance. Physical mechanisms underlying the observed phenomena are briefly explained. With benefits that potentially can reduce overall weight, volume, and cost of the air-cooled electronics, the present V-shaped corrugated carbon foam emerges as an alternative heat sink. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

Experimental study on heat transfer and pressure drop of recuperative heat exchangers using carbon foam / Y. R. Lin in Journal of heat transfer, Vol. 132 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 9 (Septembre 2010) . - pp. [091902-1/10] Titre : Experimental study on heat transfer and pressure drop of recuperative heat exchangers using carbon foam Type de document : texte imprimé Auteurs : Y. R. Lin, Auteur ; J. H. Du, Auteur ; W. Wu, Auteur Article en page(s) : pp. [091902-1/10] Note générale : Physique Langues : Anglais (eng) Mots-clés : Heat  transfer  Recuperators  Cryogenics Index. décimale : 536 Chaleur. Thermodynamique Résumé : This work focuses on the development of high-effectiveness recuperative heat exchangers using solid and corrugated carbon foam blocks. Characterization tests were conducted on heat transfer and pressure drop for a single carbon foam block with different sizes. Results show that carbon foam can be an effective medium for heat transfer enhancement, and a short length in the flow direction yields a high heat transfer coefficient. The corrugation can enhance heat transfer and reduce pressure drop at the same time. A recuperative heat exchanger with carbon foam, which consists of separate blocks of carbon foams packed between thin sheets of stainless steel, was designed. The hot and cold flow paths were arranged in counterflow in the recuperator. The heat exchanger was designed in a modular manner so that it can be scaled up for a larger heat transfer requirement or a higher overall effectiveness. The anisotropic property of carbon foam was exploited to achieve higher effectiveness for one pair of foam blocks. Experiments with four pairs of carbon foams were conducted to evaluate the performance of carbon foam used in the recuperative heat exchanger. Measurements were made for both solid and corrugated foams for comparison. With four pairs of carbon foam blocks, an overall effectiveness epsilontotal greater than 80% was achieved. This paper demonstrates an approach to reach an effectiveness epsilontotal of 98% by placing many pairs of carbon foams in series. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Experimental study on heat transfer and pressure drop of recuperative heat exchangers using carbon foam [texte imprimé] / Y. R. Lin, Auteur ; J. H. Du, Auteur ; W. Wu, Auteur . - pp. [091902-1/10]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 9 (Septembre 2010) . - pp. [091902-1/10] Mots-clés : Heat  transfer  Recuperators  Cryogenics Index. décimale : 536 Chaleur. Thermodynamique Résumé : This work focuses on the development of high-effectiveness recuperative heat exchangers using solid and corrugated carbon foam blocks. Characterization tests were conducted on heat transfer and pressure drop for a single carbon foam block with different sizes. Results show that carbon foam can be an effective medium for heat transfer enhancement, and a short length in the flow direction yields a high heat transfer coefficient. The corrugation can enhance heat transfer and reduce pressure drop at the same time. A recuperative heat exchanger with carbon foam, which consists of separate blocks of carbon foams packed between thin sheets of stainless steel, was designed. The hot and cold flow paths were arranged in counterflow in the recuperator. The heat exchanger was designed in a modular manner so that it can be scaled up for a larger heat transfer requirement or a higher overall effectiveness. The anisotropic property of carbon foam was exploited to achieve higher effectiveness for one pair of foam blocks. Experiments with four pairs of carbon foams were conducted to evaluate the performance of carbon foam used in the recuperative heat exchanger. Measurements were made for both solid and corrugated foams for comparison. With four pairs of carbon foam blocks, an overall effectiveness epsilontotal greater than 80% was achieved. This paper demonstrates an approach to reach an effectiveness epsilontotal of 98% by placing many pairs of carbon foams in series. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]