Detailed experimental investigations on frictional pressure drop of R134a during flow boiling in 5 mm diameter channel: The influence of acceleration pressure drop component

作者：Muszynski Tomasz^*; Andrzejczyk Rafal; Dorao Carlos Alberto

来源：International Journal of Refrigeration, 2017, 82: 163-173.

DOI：10.1016/j.ijrefrig.2017.05.029

• Frictional pressure drop
• Two-phase flow
• Acceleration pressure drop
• Void fraction

This article presents detailed two-phase diabatic pressure drop data for refrigerant R134a at a saturation pressure of 5.5 bar corresponding to the saturation temperature of 19.4 degrees C. Study cases have been set for a mass flux varying from 100 to 500 kg m(-2) s(-1).
The obtained data are used as a validation of the void fraction literature models, a set of graphs shows comparisons, for a representative set of experimental conditions, of the two-phase frictional pressure gradients for the adiabatic and diabatic flow.
Verification of the acceleration pressure drop predictions for two-phase adiabatic flow showed that all correlations predict that over 60% of experimental data fit in the range of +/- 30%. The model proposed in this article predicts 63% of presented data within 10% error, and 96% of the data are predicted within 30% error.

• 出版日期2017-10