Experimental Performance of a Two-Phase Ejector: Nozzle Geometry and Subcooling Effects
| Autor: | Mehdi Falsafioon, Khaled Ameur, Zine Aidoun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Entrainment (hydrodynamics)
Materials science lcsh:Engineering machinery tools and implements 020209 energy Mass flow Nozzle Flow (psychology) convergent-divergent nozzle 02 engineering and technology law.invention 020401 chemical engineering law 0202 electrical engineering electronic engineering information engineering Mass flow rate lcsh:Technological innovations. Automation 0204 chemical engineering lcsh:HD45-45.2 convergent nozzle General Engineering Injector Mechanics experiments Secondary flow Subcooling R134a two-phase ejector lcsh:TA213-215 |
| Zdroj: | Inventions Volume 5 Issue 2 Inventions, Vol 5, Iss 23, p 23 (2020) |
| ISSN: | 2411-5134 |
| DOI: | 10.3390/inventions5020023 |
| Popis: | 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&rsquo 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. |
| Databáze: | OpenAIRE |
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