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Developing adiabatic two-phase flow distribution in minichannel-branch headers.

Author(s) : KOYAMA S., KUWAHARA K., WIJAYANTA A. T., et al.

Summary

Compactness and high performance are required when designing heat exchangers with small size channels. Imperfect distribution to each channel causes a performance deterioration of these heat exchangers, particularly evaporators. The paper presents an experimental study on adiabatic two-phase flow in minichannel-branch headers. The test section consists of a 9-mm internal diameter, horizontal header and 6 vertically replaceable branches. The headers are examined for upward flows with R-134a as a test fluid at saturation temperature, mass velocity, and average vapour quality in the header inlet. Vapour-liquid phase flow rates of each branch are measured and flow regimes are observed for explaining phase separation in the header. A comparison between the two-phase frictional multiplier correlation proposed by Koyama et al. and the present experimental data are presented.

Details

  • Original title: Developing adiabatic two-phase flow distribution in minichannel-branch headers.
  • Record ID : 2007-0585
  • Languages: English
  • Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Publication date: 2006/05/21

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