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Measurement and prediction of pressure drop in two-phase micro-channel heat sinks.

Author(s) : QU W., MUDAWAR I.

Type of article: Article

Summary

This study explored hydrodynamic instability and pressure drop in a water-cooled two-phase micro-channel heat sink. Two types of two-phase hydrodynamic instability were identified: severe pressure drop oscillation and mild parallel channel instability. It was shown that severe pressure drop oscillation, which can trigger premature critical heat flux, can be eliminated simply by throttling the flow upstream from the heat sink. Different methods for predicting two-phase pressure drop were assessed for suitability to micro-channel heat-sink design. A new correlation incorporating the effects of both channel size and coolant mass velocity is proposed; it shows better accuracy than prior correlations. The second method consists of a theoretical annular two-phase flow model which, aside from excellent predictive capability, possesses the unique attributes of providing a detailed description of the various transport processes occurring in the micro-channel, as well as fundamental appeal and broader application range than correlations.

Details

  • Original title: Measurement and prediction of pressure drop in two-phase micro-channel heat sinks.
  • Record ID : 2004-1614
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 46 - n. 15
  • Publication date: 2003/07

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