Artículos de revistas
Two-Phase Frictional Pressure Drop and Flow Boiling Heat Transfer for R245fa in a 2.32-mm Tube
Fecha
2011-11Registro en:
Heat Transfer Engineering, Philadelphia, v. 32, n. 13-14, p. 1139-1149, 2011
1521-0537
10.1080/01457632.2011.562725
Autor
Tibiriçá, Cristiano Bigonha
Ribatski, Gherhardt
Institución
Resumen
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◦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%.