Documents disponibles écrits par cet auteur

Flow boiling characteristics for R1234ze(E) in 1.0 and 2.2 mm circular channels / Cristiano Bigonha Tibiriçá in Journal of heat transfer, Vol. 134 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) Titre : Flow boiling characteristics for R1234ze(E) in 1.0 and 2.2 mm circular channels Type de document : texte imprimé Auteurs : Cristiano Bigonha Tibiriçá, Auteur ; Gherhardt Ribatski, Auteur ; John Richard Thome, Auteur Année de publication : 2012 Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Boiling  Flow  visualisation  Heat  transfer  Microchannel  flow  Pattern  formation  Pipe  flow  Refrigerants Index. décimale : 536 Chaleur. Thermodynamique Résumé : Experimental flow boiling heat transfer results are presented for horizontal 1.0 and 2.2 mm I.D. (internal diameter) stainless steel tubes for tests with R1234ze(E), a new refrigerant developed as a substitute for R134a with a much lower global warming potential (GWP). The experiments were performed for these two tube diameters in order to investigate a possible transition between macro and microscale flow boiling behavior. The experimental campaign includes mass velocities ranging from 50 to 1500 kg/m2 s, heat fluxes from 10 to 300 kW/m2, exit saturation temperatures of 25, 31 and 35 °C, vapor qualities from 0.05 to 0.99 and heated lengths of 180 mm and 361 mm. Flow pattern characterization was performed using high speed videos. Heat transfer coefficient, critical heat flux and flow pattern data were obtained. R1234ze(E) demonstrated similar thermal performance to R134a data when running at similar conditions. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...] [article] Flow boiling characteristics for R1234ze(E) in 1.0 and 2.2 mm circular channels [texte imprimé] / Cristiano Bigonha Tibiriçá, Auteur ; Gherhardt Ribatski, Auteur ; John Richard Thome, Auteur . - 2012. Heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) Mots-clés : Boiling  Flow  visualisation  Heat  transfer  Microchannel  flow  Pattern  formation  Pipe  flow  Refrigerants Index. décimale : 536 Chaleur. Thermodynamique Résumé : Experimental flow boiling heat transfer results are presented for horizontal 1.0 and 2.2 mm I.D. (internal diameter) stainless steel tubes for tests with R1234ze(E), a new refrigerant developed as a substitute for R134a with a much lower global warming potential (GWP). The experiments were performed for these two tube diameters in order to investigate a possible transition between macro and microscale flow boiling behavior. The experimental campaign includes mass velocities ranging from 50 to 1500 kg/m2 s, heat fluxes from 10 to 300 kW/m2, exit saturation temperatures of 25, 31 and 35 °C, vapor qualities from 0.05 to 0.99 and heated lengths of 180 mm and 361 mm. Flow pattern characterization was performed using high speed videos. Heat transfer coefficient, critical heat flux and flow pattern data were obtained. R1234ze(E) demonstrated similar thermal performance to R134a data when running at similar conditions. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...]

Flow boiling in micro-scale channels – Synthesized literature review / Cristiano Bigonha Tibiriçá in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 301–324 Titre : Flow boiling in micro-scale channels – Synthesized literature review Titre original : Ebullition en écoulement dans les canaux à micro-échelle – synthèse de la littérature Type de document : texte imprimé Auteurs : Cristiano Bigonha Tibiriçá, Auteur ; Gherhardt Ribatski, Auteur Année de publication : 2013 Article en page(s) : pp. 301–324 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Microchannels;  Flow  boiling;  CHF;  Void  fraction;  Transition;  Flow  pattern Résumé : This paper presents a synthesized review on the recent literature concerning micro-scale flow boiling. The topics covered are macro- to micro-scale transition, flow patterns, pressure drop, heat transfer coefficient, critical heat flux, superficial void fraction and liquid entrainment. The analyses revealed some characteristics common to micro-scale two-phase flow, i.e. absence of stratified flow, predominance of annular flow over all saturated region, uniform liquid film thickness during horizontal flows, reduced liquid entrainment, high heat transfer coefficients and pressure drops. Despite the importance of liquid entrainment and void fraction in predictive methods, there is a lack of experimental results for these parameters in the micro-scale literature. Important accomplishments concerning the investigation of micro-scale flow boiling have been obtained over the last two decades, but some aspects, including local physical mechanisms related to heat transfer, onset of dryout and flow boiling instabilities still remain unclear. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003271 [article] Flow boiling in micro-scale channels – Synthesized literature review = Ebullition en écoulement dans les canaux à micro-échelle – synthèse de la littérature [texte imprimé] / Cristiano Bigonha Tibiriçá, Auteur ; Gherhardt Ribatski, Auteur . - 2013 . - pp. 301–324. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 301–324 Mots-clés : Microchannels;  Flow  boiling;  CHF;  Void  fraction;  Transition;  Flow  pattern Résumé : This paper presents a synthesized review on the recent literature concerning micro-scale flow boiling. The topics covered are macro- to micro-scale transition, flow patterns, pressure drop, heat transfer coefficient, critical heat flux, superficial void fraction and liquid entrainment. The analyses revealed some characteristics common to micro-scale two-phase flow, i.e. absence of stratified flow, predominance of annular flow over all saturated region, uniform liquid film thickness during horizontal flows, reduced liquid entrainment, high heat transfer coefficients and pressure drops. Despite the importance of liquid entrainment and void fraction in predictive methods, there is a lack of experimental results for these parameters in the micro-scale literature. Important accomplishments concerning the investigation of micro-scale flow boiling have been obtained over the last two decades, but some aspects, including local physical mechanisms related to heat transfer, onset of dryout and flow boiling instabilities still remain unclear. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003271