Abstract
This paper presents the results of an experimental study on a two-phase ejector. The main objective is to assess the effects of the nozzle’s divergent and the throat diameter on performance under various working conditions. Under the same conditions, ejector operation with a convergent nozzle, results in higher critical primary mass flow rate and lower critical pressure than with a convergent-divergent nozzle version. Experiments show as well that the flow expansion is higher in the convergent-divergent nozzle. The throat diameter turns out to have an important impact only on the amount of the critical mass flow rate. The nozzle geometry has no impact on its optimal position in the ejector. Globally, the ejector with the convergent-divergent nozzle provides a higher entrainment ratio, due to a reduced primary mass flow rate and an increased secondary flow induction. Tests also show that the ejector with a lower throat diameter provides a higher entrainment ratio, due to better suction with less primary flow. Unlike the convergent-divergent nozzle, the convergent nozzle permits an entrainment ratio almost insensitive to a wide range of primary inlet sub-cooling levels. Primary and secondary mass flow rates increase proportionally with the subcooling level and result in a quasi-constant entrainment ratio.
Highlights
An ejector is a device, which could be integrated in different processes and applications to use energy efficiently
The operation of the ejector is summarized as follows: the expansion of the primary flow in the nozzle creates a low-pressure area, which allows the entrainment of the secondary flow
The effect of the divergent was examined by comparing nozzle A to nozzle B, and regarding the effect of the throat diameter by comparing nozzle A to nozzle C
Summary
An ejector is a device, which could be integrated in different processes and applications to use energy efficiently. The use of ejectors in the industrial sector is not new. A growing interest is noticed through many studies integrating ejectors in heat pumping and refrigeration systems for higher efficiency [1,2]. The main advantage of the ejector is its simplicity (Figure 1). A high-pressure motive flow (primary flow) is used to draw and compress a low-pressure flow (secondary flow) to an intermediate pressure. The operation of the ejector is summarized as follows: the expansion of the primary flow in the nozzle creates a low-pressure area, which allows the entrainment of the secondary flow. The mixing of the two streams inside the mixing chamber may result in a first pressure increase
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