In the ejector refrigeration cycle the secondary fluid to primary fluid is called entrainment ratio. Why entrainment ratio is considered secondary the fluid mass flow rate?
IN ejector what happens that the flow of secondary fluid creates a suction pressure in a designed chamber where the primary gas is present.and in most cases this fluids are compressible ,therefore the flow rate is given in mass flow rates not in volume discharge. the flow passes the ejector opening at very high speed leading to creation of vacuum in a designed chamber where the primary......(primary means the fluid that is running in the refrigeration cycle) is evaporated.
the main parameter is the momentum ratio MR=mass flow1*Velocity1/Mass flow2*Velocity2
there is a large scatter so tests are to be foreseen
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