| Title |
A Study on Pressure Drop in Two-Phase Flow Boiling of Refrigerants in Horizontal Tube |
| Keywords |
Acceleration pressure drop ; 가속압력강하 ; Frictional pressure drop ; 마찰압력강하 ; Pure refrigerant ; 순수냉매 ; Two-phase flow boiling ; 이상유동비등 |
| Abstract |
An experimental study on the pressure drop during flow boiling for pure refrigerants R134a and R123, and their mixture was carried out in a uniformly heated horizontal tube. Tests were run at a pressure of 0.6MPa and in the ranges of heat flux 5～50kW/m2, vapor quality 0～100 percent and mass velocity of 150～600kg/m2s. Generally, the two-phase frictional multiplier is used to predict the frictional pressure drop during the two-phase flow boiling. The obtained results have been compared to the existing various correlations for the two-phase multiplier. Also, the frictional pressure drop was compared to a few available correlations; The Lockhart-Martinelli correlation considerally overpredicted the frictional pressure drop data for mixture as well as pure components in the entire mass velocity ranges employed in the present study, while the Chisholm correlation underpredicted the present data. The Friedel correlation was found to satisfactorily correlate the frictional pressure drop data except for a low quality region. |