Documents disponibles écrits par cet auteur

Boiling of dilute emulsions — toward a new modeling framework / Matthew L. Roesle in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5188–5196 Titre : Boiling of dilute emulsions — toward a new modeling framework Type de document : texte imprimé Auteurs : Matthew L. Roesle, Auteur ; F. A. Kulacki, Auteur Année de publication : 2010 Article en page(s) : pp. 5188–5196 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Emulsions  Boiling  process Résumé : Boiling of emulsions is a field that has been studied little and is poorly understood. Experiments have shown that boiling in emulsion is a complex phenomenon and that a wide range of behaviors are possible. A model of boiling emulsions put forward by one group of researchers provides some explanation for the behavior of emulsions but seems to be insufficiently detailed to provide deeper insight into the boiling process or prediction of boiling. In this paper, a review of work to-date is presented. We also suggest an alternative set of mechanisms for boiling in dilute emulsions. It is shown how these mechanisms may be integrated into the Euler−Euler model of multiphase flow to describe the overall behavior of boiling emulsions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9013259 [article] Boiling of dilute emulsions — toward a new modeling framework [texte imprimé] / Matthew L. Roesle, Auteur ; F. A. Kulacki, Auteur . - 2010 . - pp. 5188–5196. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5188–5196 Mots-clés : Emulsions  Boiling  process Résumé : Boiling of emulsions is a field that has been studied little and is poorly understood. Experiments have shown that boiling in emulsion is a complex phenomenon and that a wide range of behaviors are possible. A model of boiling emulsions put forward by one group of researchers provides some explanation for the behavior of emulsions but seems to be insufficiently detailed to provide deeper insight into the boiling process or prediction of boiling. In this paper, a review of work to-date is presented. We also suggest an alternative set of mechanisms for boiling in dilute emulsions. It is shown how these mechanisms may be integrated into the Euler−Euler model of multiphase flow to describe the overall behavior of boiling emulsions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9013259

Buoyant convection in superposed metal foam and water layers / V. Kathare in Journal of heat transfer, Vol. 132 N° 1 (Janvier 2010) 

Public ISBD [article]  in Journal of heat transfer > Vol. 132 N° 1 (Janvier 2010) . - pp. [014503-1/4] Titre : Buoyant convection in superposed metal foam and water layers Type de document : texte imprimé Auteurs : V. Kathare, Auteur ; F. A. Kulacki, Auteur ; Jane H. Davidson, Auteur Article en page(s) : pp. [014503-1/4] Note générale : Physique Langues : Anglais (eng) Mots-clés : Natural  convection  Metal  foam  Heat  transfer  enhancement Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer measurements for natural convection in superposed metal foam and water layers are reported. Two systems heated at the lower boundary are considered: a water-filled cavity with a foam layer on the heated surface and a water-filled cavity with foam layers on the upper and lower surfaces. The present experiments use open cell copper foams with a nominal porosity of 92%, and the relative thicknesses of the water and foam layers are varied. Steady state Nusselt numbers show that the presence of foam on the boundaries enhances overall heat transfer coefficients over that for the water-only layer. Enhancement of overall Nusselt numbers varies from 12% to 60% depending on Rayleigh number. Sublayer configurations with foam on both heat transfer surfaces are more effective for enhancement than a configuration with foam only on the heated surface. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Buoyant convection in superposed metal foam and water layers [texte imprimé] / V. Kathare, Auteur ; F. A. Kulacki, Auteur ; Jane H. Davidson, Auteur . - pp. [014503-1/4]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 1 (Janvier 2010) . - pp. [014503-1/4] Mots-clés : Natural  convection  Metal  foam  Heat  transfer  enhancement Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer measurements for natural convection in superposed metal foam and water layers are reported. Two systems heated at the lower boundary are considered: a water-filled cavity with a foam layer on the heated surface and a water-filled cavity with foam layers on the upper and lower surfaces. The present experiments use open cell copper foams with a nominal porosity of 92%, and the relative thicknesses of the water and foam layers are varied. Steady state Nusselt numbers show that the presence of foam on the boundaries enhances overall heat transfer coefficients over that for the water-only layer. Enhancement of overall Nusselt numbers varies from 12% to 60% depending on Rayleigh number. Sublayer configurations with foam on both heat transfer surfaces are more effective for enhancement than a configuration with foam only on the heated surface. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

Journal of heat transfer / R. J. Simoneau

Public ISBD [périodique]  Voir les bulletins disponibles Rechercher dans ce périodique  Titre : Journal of heat transfer : transactions of the ASME Type de document : texte imprimé Auteurs : R. J. Simoneau, Directeur de publication, rédacteur en chef ; F. A. Kulacki, Secrétaire ; Yang, K. T., Directeur de la recherche Editeur : New-York : ASME Année de publication : 1959- ISBN/ISSN/EAN : 0022-1481 Note générale : Périodicité: Trimestrielle puis Bimestrielle puis Mensuelle 1973-1979 1984-1990 1998 2001-2002 2005-2008 2009-2012 Langues : Anglais (eng) Mots-clés : Transfert  de  chaleur  --  Périodiques Index. décimale : 536.2 Conduction, transmission de la chaleur. Conduction thermique, transmission thermique Note de contenu : Heat transfer DEWEY : 536 [périodique]  Voir les bulletins disponibles Rechercher dans ce périodique Journal of heat transfer : transactions of the ASME [texte imprimé] / R. J. Simoneau, Directeur de publication, rédacteur en chef ; F. A. Kulacki, Secrétaire ; Yang, K. T., Directeur de la recherche . - New-York : ASME, 1959-. ISSN : 0022-1481 Périodicité: Trimestrielle puis Bimestrielle puis Mensuelle 1973-1979 1984-1990 1998 2001-2002 2005-2008 2009-2012 Langues : Anglais (eng) Mots-clés : Transfert  de  chaleur  --  Périodiques Index. décimale : 536.2 Conduction, transmission de la chaleur. Conduction thermique, transmission thermique Note de contenu : Heat transfer DEWEY : 536

Negatively buoyant plume flow in a baffled heat exchanger / Sandra K. S. Boetcher in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 3 (Août 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 3 (Août 2010) . - pp. [034502/1-7] Titre : Negatively buoyant plume flow in a baffled heat exchanger Type de document : texte imprimé Auteurs : Sandra K. S. Boetcher, Auteur ; F. A. Kulacki, Auteur ; Jane H. Davidson, Auteur Année de publication : 2011 Article en page(s) : pp. [034502/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Thermal  stores  Immersed  heat  exchanger  Negatively  buoyant  flow Index. décimale : 621.47 Résumé : A numerical simulation of transient two-dimensional negatively buoyant flow into a straight baffle situated below an isothermal circular cylinder in an initially isothermal enclosure is presented for both an adiabatic and a highly conducting baffle for Rayleigh numbers from 106 to 107. Results show the effects of baffle offset, width, and length on the point where viscous flow develops and on velocity profiles within the baffle. Results are interpreted to guide the design of straight baffles to reduce destruction of stratification in thermal stores using an immersed heat exchanger. The preferred geometry is a low-conductivity baffle of width equal to the effective width of the heat exchanger and 15 or more cylinder diameters in length to ensure nearly fully developed flow at the baffle outlet. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Negatively buoyant plume flow in a baffled heat exchanger [texte imprimé] / Sandra K. S. Boetcher, Auteur ; F. A. Kulacki, Auteur ; Jane H. Davidson, Auteur . - 2011 . - pp. [034502/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 3 (Août 2010) . - pp. [034502/1-7] Mots-clés : Thermal  stores  Immersed  heat  exchanger  Negatively  buoyant  flow Index. décimale : 621.47 Résumé : A numerical simulation of transient two-dimensional negatively buoyant flow into a straight baffle situated below an isothermal circular cylinder in an initially isothermal enclosure is presented for both an adiabatic and a highly conducting baffle for Rayleigh numbers from 106 to 107. Results show the effects of baffle offset, width, and length on the point where viscous flow develops and on velocity profiles within the baffle. Results are interpreted to guide the design of straight baffles to reduce destruction of stratification in thermal stores using an immersed heat exchanger. The preferred geometry is a low-conductivity baffle of width equal to the effective width of the heat exchanger and 15 or more cylinder diameters in length to ensure nearly fully developed flow at the baffle outlet. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Two-phase heat transfer and bubble characteristics in a microchannel array / T. P. Lagus in Journal of heat transfer, Vol. 134 N° 7 (Juillet 2012) 

Public ISBD [article]  in Journal of heat transfer > Vol. 134 N° 7 (Juillet 2012) . - 11 p. Titre : Two-phase heat transfer and bubble characteristics in a microchannel array Type de document : texte imprimé Auteurs : T. P. Lagus, Auteur ; F. A. Kulacki, Auteur Année de publication : 2012 Article en page(s) : 11 p. Note générale : heat transfer Langues : Anglais (eng) Mots-clés : microchannels;  flow  boiling;  bubble  formation;  vapor  slug  flow;  flow  visualization Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer coefficients and bubble motion characteristics are reported for two-phase water flow in an array of 13 equally spaced microchannels over an area of 1 cm2. Each channel has Dh = 451 ± 38 µm, W/H = 0.8, and L/Dh = 22.2. Uniform heat flux is applied through the base, and wall temperatures are determined from the thermocouple readings corrected for heat conduction effects. The upper surface is insulated and transparent. Single-phase heat transfer coefficients are in a good agreement with comparable trends of existing correlations for developing flow and heat transfer, although a difference is seen due to the insulated upper surface. Two-phase heat transfer coefficients and flow characteristics are determined for 221 < G < 466 kg/m2s and 250 < q < 1780 kW/m2. Heat transfer coefficients normalized with mass flux exhibit a trend comparable to that of available studies that use similar thermal boundary conditions. Flow visualization shows expanding vapor slug flow as the primary flow regime with nucleation and bubbly flow as the precursors. Analysis of bubble dynamics reveals ~t1/3 dependence for bubble growth. Flow reversal is observed and quantified, and different speeds of the vapor phase fronts are quantified at the leading and trailing edges of vapor slugs once the bubble diameter equals the channel width. Bubble formation, growth, coalescence, and detachment at the outlet of the array are best characterized by the Weber number. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000007 [...] [article] Two-phase heat transfer and bubble characteristics in a microchannel array [texte imprimé] / T. P. Lagus, Auteur ; F. A. Kulacki, Auteur . - 2012 . - 11 p. heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol. 134 N° 7 (Juillet 2012) . - 11 p. Mots-clés : microchannels;  flow  boiling;  bubble  formation;  vapor  slug  flow;  flow  visualization Index. décimale : 536 Chaleur. Thermodynamique Résumé : Heat transfer coefficients and bubble motion characteristics are reported for two-phase water flow in an array of 13 equally spaced microchannels over an area of 1 cm2. Each channel has Dh = 451 ± 38 µm, W/H = 0.8, and L/Dh = 22.2. Uniform heat flux is applied through the base, and wall temperatures are determined from the thermocouple readings corrected for heat conduction effects. The upper surface is insulated and transparent. Single-phase heat transfer coefficients are in a good agreement with comparable trends of existing correlations for developing flow and heat transfer, although a difference is seen due to the insulated upper surface. Two-phase heat transfer coefficients and flow characteristics are determined for 221 < G < 466 kg/m2s and 250 < q < 1780 kW/m2. Heat transfer coefficients normalized with mass flux exhibit a trend comparable to that of available studies that use similar thermal boundary conditions. Flow visualization shows expanding vapor slug flow as the primary flow regime with nucleation and bubbly flow as the precursors. Analysis of bubble dynamics reveals ~t1/3 dependence for bubble growth. Flow reversal is observed and quantified, and different speeds of the vapor phase fronts are quantified at the leading and trailing edges of vapor slugs once the bubble diameter equals the channel width. Bubble formation, growth, coalescence, and detachment at the outlet of the array are best characterized by the Weber number. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000007 [...]

Use of a shroud and baffle to improve natural convection to immersed heat exchangers / Sandra K. S. Boetcher in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 1 (Fevrier 2011) 

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