Two-Phase Frictional Pressure Drop and Flow Boiling Heat Transfer for R245fa in a 2.32-mm Tube

Autor(es)

Tibirica, Cristiano B. ^[1] ; Ribatski, Gherhardt ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Mech Engn, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HEAT TRANSFER ENGINEERING; v. 32, n. 13-14, p. 1139-1149, 2011.
• Citações Web of Science: 15

Resumo

Experimental two-phase frictional pressure drop and flow boiling heat transfer results are presented for a horizontal 2.32-mm ID stainless-steel tube using R245fa as working fluid. The frictional pressure drop data was obtained under adiabatic and diabatic conditions. Experiments were performed for mass velocities ranging from 100 to 700 kg m(-2) s(-1), heat flux from 0 to 55 kW m(-2), exit saturation temperatures of 31 and 41 degrees C, and vapor qualities from 0.10 to 0.99. Pressures drop gradients and heat transfer coefficients ranging from 1 to 70 kPa m(-1) and from 1 to 7 kW m(-2) K-1 were measured. It was found that the heat transfer coefficient is a strong function of the heat flux, mass velocity, and vapor quality. Five frictional pressure drop predictive methods were compared against the experimental database. The Cioncolini et al. (2009) method was found to work the best. Six flow boiling heat transfer predictive methods were also compared against the present database. Liu and Winterton (1991), Zhang et al. (2004), and Saitoh et al. (2007) were ranked as the best methods. They predicted the experimental flow boiling heat transfer data with an average error around 19%. (AU)

• Processo FAPESP: 05/60031-0 - Estudo teórico-experimental da ebulição convectiva de refrigerantes halogenados no interior de micro-canais
• Beneficiário: Gherhardt Ribatski
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 07/53950-5 - Estudo teórico-experimental da transferência de calor e do fluxo crítico durante a ebulição convectiva no interior de microcanais
• Beneficiário: Cristiano Bigonha Tibirica
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 06/52089-1 - Estudo teorico experimental da ebulicao convectiva de refrigerantes halogenados no interior de micro canais.
• Beneficiário: Gherhardt Ribatski
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores