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Optimal nozzle exit position for an ejector refrigeration system: a numerical study.

Number: 1157

Author(s) : RAND C. P., CROQUER S., POIRIER M., PONCET S.

Summary

A significant number of studies focused on the impact of the nozzle head exit position (NXP) on the single-phase ejector performance and reported the existence of a single optimal NXP. Using CFD simulations, the current study observes peaks and valleys in the entrainment ratio (ω) when the NXP varies for fixed operating conditions. The Reynolds-Averaged Navier Stokes (RANS) model successfully captures the complex flow behaviour associated with the change in NXP. The Mach contours and compound choking criterion (β) are used to investigate how the NXP affects the entrainment ratio. The results suggest that, the more a flow is double-choked and comprised of a longer compound supersonic section, the more the NXP is deemed optimal. The compound supersonic section length is found to vary significantly with the change in NXP. This is the first study to utilize the compound choking theory to explain the impact of the NXP.

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Pages: 11 p.

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Details

  • Original title: Optimal nozzle exit position for an ejector refrigeration system: a numerical study.
  • Record ID : 30029513
  • Languages: English
  • Subject: Technology
  • Source: 7th IIR International Conference on Sustainability and the Cold Chain Online. Proceedings: April 11-13 2022
  • Publication date: 2022/04/11
  • DOI: http://dx.doi.org/10.18462/iir.iccc2022.1157
  • Document available for consultation in the library of the IIR headquarters only.

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