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Détail de l'indexation
536 : Chaleur. Thermodynamique
536.05
536.2 Conduction, transmission de la chaleur. Conduction thermique, transmission thermique
536.24 Conduction d'un milieu à un autre. Transfert de chaleur. Echange. Transmission thermique
536.4 Action de la chaleur,de la température,sur les corps,sur les volumes ou sur leur structure.
536.5 Température. Echelles de température. Mesure et contrôle des températures. thermomètres. Thermométrie. Thermorégulation
536.6 Mesure de la quantité de chaleur. Calorimétrie
536.7 Thermodynamique. Energétique
536.7/621.4
536.2 Conduction, transmission de la chaleur. Conduction thermique, transmission thermique
536.24 Conduction d'un milieu à un autre. Transfert de chaleur. Echange. Transmission thermique
536.4 Action de la chaleur,de la température,sur les corps,sur les volumes ou sur leur structure.
536.5 Température. Echelles de température. Mesure et contrôle des températures. thermomètres. Thermométrie. Thermorégulation
536.6 Mesure de la quantité de chaleur. Calorimétrie
536.7 Thermodynamique. Energétique
536.7/621.4
Ouvrages de la bibliothèque en indexation 536
Affiner la rechercheVolumetric heat capacity enhancement in thin films of amorphous fluorocarbon polymers / Hongxiang Tian in Journal of heat transfer, Vol. 134 N° 8 (special issue) (Août 2012)
[article]
in Journal of heat transfer > Vol. 134 N° 8 (special issue) (Août 2012) . - 09 p.
Titre : Volumetric heat capacity enhancement in thin films of amorphous fluorocarbon polymers Type de document : texte imprimé Auteurs : Hongxiang Tian, Auteur ; Marc G. Ghossoub, Auteur ; Oksen T. Baris, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : heat transfer Langues : Anglais (eng) Mots-clés : thin film; differential scanning calorimetry; heat capacity; fluorocarbon polymer Index. décimale : 536 Chaleur. Thermodynamique Résumé : Plasma deposited amorphous fluorocarbon polymers find use in biopassivation, and as low-friction coatings, adhesion promoters, and interlayer dielectrics. Here, we exploit their ease of deposition into ultrathin layers (<50 nm thick) to explore their potential as thermal storage elements. We design and fabricate a microcalorimeter for measuring the heat capacity of thin fluorocarbons. Conventional thin film calorimetry assumes adiabatic conditions that lead to large errors as film thickness decreases. We propose a new data analysis procedure that incorporates a one-dimensional solution of the transient heat diffusion equation to account for conduction losses. The data for films with thicknesses in the range 12–27 nm reveal a lowering of the melting point and an increase in the volumetric heat capacity with decreasing thickness. We attribute this to change in the carbon to fluorine ratio in the films' composition. The volumetric heat capacity approximately doubles at room temperature as the film thickness decreases from 27 nm to 12 nm. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000008 [...] [article] Volumetric heat capacity enhancement in thin films of amorphous fluorocarbon polymers [texte imprimé] / Hongxiang Tian, Auteur ; Marc G. Ghossoub, Auteur ; Oksen T. Baris, Auteur . - 2012 . - 09 p.
heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 8 (special issue) (Août 2012) . - 09 p.
Mots-clés : thin film; differential scanning calorimetry; heat capacity; fluorocarbon polymer Index. décimale : 536 Chaleur. Thermodynamique Résumé : Plasma deposited amorphous fluorocarbon polymers find use in biopassivation, and as low-friction coatings, adhesion promoters, and interlayer dielectrics. Here, we exploit their ease of deposition into ultrathin layers (<50 nm thick) to explore their potential as thermal storage elements. We design and fabricate a microcalorimeter for measuring the heat capacity of thin fluorocarbons. Conventional thin film calorimetry assumes adiabatic conditions that lead to large errors as film thickness decreases. We propose a new data analysis procedure that incorporates a one-dimensional solution of the transient heat diffusion equation to account for conduction losses. The data for films with thicknesses in the range 12–27 nm reveal a lowering of the melting point and an increase in the volumetric heat capacity with decreasing thickness. We attribute this to change in the carbon to fluorine ratio in the films' composition. The volumetric heat capacity approximately doubles at room temperature as the film thickness decreases from 27 nm to 12 nm. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000008 [...] Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube / Tailian Chen in Journal of heat transfer, Vol. 134 N° 2 (Fevrier 2012)
[article]
in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) . - 08 p.
Titre : Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube Type de document : texte imprimé Auteurs : Tailian Chen, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Boiling Copper Flow measurement Heat transfer Pipe flow Refrigerants Water Index. décimale : 536 Chaleur. Thermodynamique Résumé : Pool boiling heat transfer has been extensively studied over decades, but the effect of boundary heating conditions on boiling received little attention. In this work, heat transfer coefficients during pool boiling of five different refrigerants (R123, R245fa, R236fa, R134a, and R22) on the outside surface of a smooth copper tube were measured at the saturation temperature of 6.7 °C; water flows inside the tube and provides heat to the refrigerants to boil (thus, water-heated boiling). Measurements showed that the refrigerant of a higher vapor pressure has a higher heat transfer coefficient, with the exception that R22 performs nearly the same as R134a. A correlation previously developed for electrically-heated pool boiling on cylindrical tubes underpredicts by 30%–46% the heat transfer coefficients during water-heated boiling of the five refrigerants. Among the pool boiling correlations reviewed in this work, the Cooper correlation (for pool boiling on cylindrical tubes) predicts the boiling heat transfer coefficients of R22 and R245fa reasonably well (within ±8.5%), but not as well those of the other three refrigerants (underpredicts by nearly 30% for R134a and R236fa and overpredicts by nearly 40% for R123). It is found that the predicted boiling heat transfer coefficients of the five refrigerants by the modified Gorenflo correlation (simply adding a constant multiplier of 1.47 to the Gorenflo correlation) are in excellent agreement with their respective measurements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000002 [...] [article] Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube [texte imprimé] / Tailian Chen, Auteur . - 2012 . - 08 p.
Heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) . - 08 p.
Mots-clés : Boiling Copper Flow measurement Heat transfer Pipe flow Refrigerants Water Index. décimale : 536 Chaleur. Thermodynamique Résumé : Pool boiling heat transfer has been extensively studied over decades, but the effect of boundary heating conditions on boiling received little attention. In this work, heat transfer coefficients during pool boiling of five different refrigerants (R123, R245fa, R236fa, R134a, and R22) on the outside surface of a smooth copper tube were measured at the saturation temperature of 6.7 °C; water flows inside the tube and provides heat to the refrigerants to boil (thus, water-heated boiling). Measurements showed that the refrigerant of a higher vapor pressure has a higher heat transfer coefficient, with the exception that R22 performs nearly the same as R134a. A correlation previously developed for electrically-heated pool boiling on cylindrical tubes underpredicts by 30%–46% the heat transfer coefficients during water-heated boiling of the five refrigerants. Among the pool boiling correlations reviewed in this work, the Cooper correlation (for pool boiling on cylindrical tubes) predicts the boiling heat transfer coefficients of R22 and R245fa reasonably well (within ±8.5%), but not as well those of the other three refrigerants (underpredicts by nearly 30% for R134a and R236fa and overpredicts by nearly 40% for R123). It is found that the predicted boiling heat transfer coefficients of the five refrigerants by the modified Gorenflo correlation (simply adding a constant multiplier of 1.47 to the Gorenflo correlation) are in excellent agreement with their respective measurements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000002 [...] Wetting mode evolution of steam dropwise condensation on superhydrophobic surface in the presence of noncondensable gas / Xuehu Ma in Journal of heat transfer, Vol. 134 N° 2 (Fevrier 2012)
[article]
in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) . - 09 p.
Titre : Wetting mode evolution of steam dropwise condensation on superhydrophobic surface in the presence of noncondensable gas Type de document : texte imprimé Auteurs : Xuehu Ma, Auteur ; Sifang Wang, Auteur ; Zhong Lan, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Air Condensation Contact angle Drops Heat transfer Hydrophobicity Steam Surface roughness Wetting Index. décimale : 536 Chaleur. Thermodynamique Résumé : It is well known that heat transfer in dropwise condensation (DWC) is superior to that in filmwise condensation (FWC) by at least one order of magnitude. Surfaces with larger contact angle (CA) can promote DWC heat transfer due to the formation of “bare” condensation surface caused by the rapid removal of large condensate droplets and high surface replenishment frequency. Superhydrophobic surfaces with high contact angle (> 150°) of water and low contact angle hysteresis (< 5°) seem to be an ideal condensing surface to promote DWC and enhance heat transfer, in particular, for the steam-air mixture vapor. In the present paper, steam DWC heat transfer characteristics in the presence of noncondensable gas (NCG) were investigated experimentally on superhydrophobic and hydrophobic surfaces including the wetting mode evolution on the roughness-induced superhydrophobic surface. It was found that with increasing NCG concentration, the droplet conducts a transition from the Wenzel to Cassie-Baxter mode. And a new condensate wetting mode—a condensate sinkage mode—was observed, which can help to explain the effect of NCG on the condensation heat transfer performance of steam-air mixture on a roughness-induced superhydrophobic SAM-1 surface. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000002 [...] [article] Wetting mode evolution of steam dropwise condensation on superhydrophobic surface in the presence of noncondensable gas [texte imprimé] / Xuehu Ma, Auteur ; Sifang Wang, Auteur ; Zhong Lan, Auteur . - 2012 . - 09 p.
Heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) . - 09 p.
Mots-clés : Air Condensation Contact angle Drops Heat transfer Hydrophobicity Steam Surface roughness Wetting Index. décimale : 536 Chaleur. Thermodynamique Résumé : It is well known that heat transfer in dropwise condensation (DWC) is superior to that in filmwise condensation (FWC) by at least one order of magnitude. Surfaces with larger contact angle (CA) can promote DWC heat transfer due to the formation of “bare” condensation surface caused by the rapid removal of large condensate droplets and high surface replenishment frequency. Superhydrophobic surfaces with high contact angle (> 150°) of water and low contact angle hysteresis (< 5°) seem to be an ideal condensing surface to promote DWC and enhance heat transfer, in particular, for the steam-air mixture vapor. In the present paper, steam DWC heat transfer characteristics in the presence of noncondensable gas (NCG) were investigated experimentally on superhydrophobic and hydrophobic surfaces including the wetting mode evolution on the roughness-induced superhydrophobic surface. It was found that with increasing NCG concentration, the droplet conducts a transition from the Wenzel to Cassie-Baxter mode. And a new condensate wetting mode—a condensate sinkage mode—was observed, which can help to explain the effect of NCG on the condensation heat transfer performance of steam-air mixture on a roughness-induced superhydrophobic SAM-1 surface. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000002 [...]