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Description: Two phase void fraction models

References:
Tibirica, C. B.; Rocha, D. M. ; Sueth JR., I. L. S. ; Bochio, G. ; Shimizu, G. K. K. ; Barbosa, M. C. ; Ferreira, S. S. . A complete set of simple and optimized correlations for microchannel flow boiling and two-phase flow applications. APPLIED THERMAL ENGINEERING, v. 126, p. 774-795, 2017

Gardenghi, A.R.; Filho, E.d.S.; Chagas, D.G.; Scagnolatto, G.; Oliveira, R.M.; Tibirica, C.B. Overview of Void Fraction Measurement Techniques, Databases and Correlations for Two-Phase Flow in Small Diameter Channels. Fluids, 5, 216, 2020.

Equations/Symbols:

Calculate:
Insert saturation temperature (Tsat), mass velocity (G), vapor quality (x) and tube diameter (D) and press 'Calculate'.

Fluid: R134a Water Air-water T_sat (K): p (Pa)*: G (kg/s/m²): x (-): D (m):
* pressure is used only for air-water flow.

Fluid properties: rhol=1,191.95 kg/m3 rhov=36.29 kg/m3 mul=0.000185310 Pa.s muv=0.000012141 Pa.s σ=0.007526701 N.m	Dimensionless numbers αhomogeneous=0.97(-) αTibirica_et_al_2017=0.92(-) αGardenghi_et_al_2020=0.92(-) sTibirica_et_al_2017=2.99(-) sGardenghi_et_al_2020=2.75(-)	Superfical velocity jl=0.21 m/s jg=6.89 m/s

Heat Transfer Research Group - HTRG
University of Sao Paulo - USP