This causes the driving force to draw the suction fluid into the ejector. In the actual scenario, the motive fluid expands to a pressure lower than the suction process fluid pressure. Velocity coming out from a motive nozzle is 3 to 4 times the Mach number. The expansion of the motive fluid through the motive nozzle causes supersonic velocities at the exit of the nozzle. In the ejector, the velocity of the motive fluid becomes very high as it expands across the converging and diverging nozzles from motive pressure to the operating pressure of process fluid. Finally, by re-compressing the mixed fluid it meets the destination pressure. ![]() ![]() As it propagates through the diverging section the kinetic energy converts into pressure energy by decreasing its velocity and increasing the pressure. ![]() Then both the fluid is mixed & flows through the diverging section consisting of a diverging nozzle. This transformation results in a low-pressure region that provides the motive force to draw the process fluid. The ejector has a converging section in which velocity increases to convert pressure energy into kinetic energy.
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