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Developing two-phase flow distribution in horizontal headers with downward minichannel-branches.

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

Summary

When a two-phase flow is within the header, the phases are distributed unequally into the branches. A maldistribution will lead to a performance deterioration of these heat exchangers mostly evaporators. This paper presents an experimental study on a two-phase flow in minichannel-branch headers for evaporators. The test section consists of a 9 mm i.d. horizontal header and 6 vertically branching conduits. Each branch has 6 x 0.85 mm i.d. minichannels. The headers are examined with R-134a as a test fluid at saturation temperature of about 21°C, mass velocity of about 130 kg/(m2.s), and average vapour quality in the header inlet of about 0.1, 0.2, 0.3 and 0.4. The vapour-liquid phase mass flows enter into the branches are measured and the flow regimes at each branch inlet in the headers are presented.

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Details

  • Original title: Developing two-phase flow distribution in horizontal headers with downward minichannel-branches.
  • Record ID : 2007-1489
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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