A CFD study on two-phase frozen flow of air/water through a safety relief valve

Moftah S. Alshaikh, William Dempster

Research output: Contribution to conferencePaper

78 Downloads (Pure)

Abstract

The air-water two phase critical flows through a safety relief valve commonly used in the refrigeration industry is examined with particular emphasis on the prediction of the critical mass flowrates using CFD based approaches. The expansion of the gas through the valve and the associated acceleration is coupled to the liquid phase and results in changes to the velocity slip with the possibility of influencing the choking conditions and the magnitude of the critical mass flows. These conditions are poorly reported in the literature for safety valves. This paper presents a study where the ability of established two phase multi-dimensional modelling approaches to predict such conditions are investigated. Comparison with the simplified mixture model will show that this model tends to underestimate mass flowrates for medium to high liquid mass fraction. However, the two fluid model can adequately account for the thermal and mechanical non equilibrium for these complex flow conditions with the use of simplified droplet sizing rules.
Original languageEnglish
Number of pages10
Publication statusPublished - 18 Sep 2014
Event13th International Conference on Multiphase Flow in Industrial Plants, MFIP13 - Genoa, Sestri Levante, Italy
Duration: 16 Sep 201419 Sep 2014

Conference

Conference13th International Conference on Multiphase Flow in Industrial Plants, MFIP13
CountryItaly
CitySestri Levante
Period16/09/1419/09/14

Keywords

  • two-phase flow
  • CFD analysis
  • multi-dimensional modelling
  • refrigeration engineering

Fingerprint Dive into the research topics of 'A CFD study on two-phase frozen flow of air/water through a safety relief valve'. Together they form a unique fingerprint.

  • Cite this

    Alshaikh, M. S., & Dempster, W. (2014). A CFD study on two-phase frozen flow of air/water through a safety relief valve. Paper presented at 13th International Conference on Multiphase Flow in Industrial Plants, MFIP13, Sestri Levante, Italy.