Gas leakage through the radial clearance is an important cause of volumetric efficiency loss in rolling piston compressors. A good understanding of its mechanism is essential in any attempt to increase the volumetric efficiency of the compressor. In this work the gas leakage is considered to be caused by a mixture composed by oil and refrigerant dissolved in it. The mixture flow is modeled as a stationary homogeneous two-phase flow. The results show that the bubbles formation due to the solubility reduction of the refrigerant in the oil changes the flow characteristics significantly, reducing the mass flow rate of both mixture and refrigerant gas, mainly at low temperatures. I was found that the mass flow rate of the refrigerant gas calculated using the two-phase flow model can be 30 % lower than the mass flow rate of the refrigerant gas estimated using the single-phase flow model.
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