Typical oil separators divert the flow of refrigerant and oil, thereby separating the oil. The oil is collected and returned to the compressor. As the refrigerant vapor and oil pass through the inlet line, the oil, being more dense, collects on the screen.
Because of the change in flow direction, the fact that oil atomizes into tiny droplets instead of vaporizing, and the reduction in flow velocity, the oil drips and collects at the bottom of the separator instead of flowing out the outlet with the refrigerant vapor.
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