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A new diabatic two phase flow pattern transition model of R600a.

Author(s) : YANG Z. Q., GONG M., CHEN G., et al.

Type of article: Article, IJR article

Summary

In this paper, a detailed experimental study was carried out to investigate the two phase flow patterns of R600a in a smooth horizontal tube with an inner diameter of 6?mm. The experiments were performed at conditions covering saturation pressures from 0.215 to 0.415?MPa, mass fluxes from 67 to 194?kg?m-2?s-1 and heat fluxes from 10.6 to 75.0?kW?m-2. Based on high speed camera, four main flow regimes can be identified: plug flow, stratified-wavy flow, slug flow and annular flow. Intermittent flow (include plug and slug flow) to annular flow transition was detected and plotted on flow pattern map. Comparisons between available intermittent/annular (I/A) transition lines in the literature and the experimental data have been made. The result shows that no transition equations can fit the experimental transition curve well. By taking the surface tension, gravity force, heat flux, viscosity and density into account, four dimensionless number were introduced into the transition equation. Finally, a transition equation of intermittent/annular flow for R600a was proposed and shows good agreements with the experimental data.

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Pages: 138-144

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Details

  • Original title: A new diabatic two phase flow pattern transition model of R600a.
  • Record ID : 30025494
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 99
  • Publication date: 2019/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2018.12.025

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