![]() ![]() The section between motive nozzle (2) and diffuser (4 + 5) has the lowest static pressure, approximately equivalent to the suction pressure p s. At this point the suction flow enters into the ejector head (3) through the suction connection B and is mixed with the motive fluid flowing with high velocity. Motive flow and suction flow pass together - as a mixture - through the diffuser, loosing velocity and Part of the kinetic energy is transferred to the suction flow. ![]() The increase from suction pressure ps to discharge pressure p d corresponds to the delivery head for the suction flow or to the pressure difference of the jet ejector. The ratio p d / p s is the compression ratio of a jet ejector. Ln a jet ejector the static pressure energy of the motive flow which cannot be directly transferred is thus converted into kinetic energy. This kinetic energy can be released to the suction flow by impulse transfer while both flows mingle. The diffuser converts the kinetic energy of the mixture consisting of motive flow and suction flow back into static pressure energy. Finally, the effect of using different working fluids on the performance of the ejector refrigeration system will be reviewed.Ln the steam jet vacuum ejector illustrated below, the critical pressure ratio is exceeded in the motive nozzle (2) (this can be recognized by the expansion of the nozzle cross-section downstream the minimum throat diameter.) The steam velocity exceeds the sonic velocity accordingly. In the third part, the study focus is on the main ejector refrigeration systems proposed. ![]() In addition, experimental flow visualization attempts are also presented. The second part is dedicated to reviewing the attempts made in proposing different mathematical models to investigate the behavior of the ejector. In the first part, the focus is on the effect of different geometrical aspects affecting the performance of the ejector in terms of entertainment ratio, pressure ratio and other flow related features, where various geometrical aspects are reviewed including primary nozzle position, area ratio, mixing suction length. The review is to be structured four parts. The objective of this work is to provide a literature survey on the research attempts made in the field of ejector refrigeration systems and the studies made on the ejector as a component. ![]()
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