Vol 7, No 2 (2016) > Mechanical Engineering >

Void Fraction of Flow Boiling with Propane in Circular Horizontal Tube

Sentot Novianto, Agus S. Pamitran, Raldi Koestoer, Engkos A. Kosasih, Muhammad Idrus Alhamid

 

Abstract:

An investigation into flow boiling void
fraction was conducted to observe its characteristics and to develop a new
correlation of void fraction based on the separated model. The study used a
natural refrigerant of R-290, flowed in a horizontal tube of 7.6 mm inner
diameter under experimental conditions of 3.7 to 9.6oC saturation
temperature, 10 to 25 kW/m2 heat flux, and 185 to 445 kg/m2s
mass flux. The void fraction, calculated by the present experimental data, was
used for comparison with 31 existing correlations, including model types as
follows: homogeneous, slip ratio, Kαh correlation, drift flux, and a model
based on the Lockhart-Martinelli correlation (Xtt). A new void fraction correlation,
as a function of liquid and vapor Reynolds numbers, was proposed, based on the
data. The measured pressure drop was compared with some pressure drop
correlations that use the newly developed void fraction combination. The best
prediction was shown by the homogeneous model.

Keywords: Void fraction; Pressure drop; Two-phase flow; Boiling; Propane

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