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Abstract
Intube flow boiling experiments for refrigerant R-134a mixed with a lubricating oil are reported for a plain, horizontal tube. The tests were run at a nominal inlet pressure of 3.4 bar over a wide range of vapor qualities at mass velocities of 100, 200, and 300 kg/m2s (73.5, 147 and 220.5 thousands of lb/h ft2) for inlet oil concentrations from 0-5 wt.% oil. At low to intermediate vapor qualities (0.2