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Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications. I. Pressure drop characteristics.

Author(s) : LEE J., MUDAWAR I.

Type of article: Article

Summary

Two-phase pressure drop was measured across a micro-channel heat sink that served as an evaporator in a refrigeration cycle. Predictions of the homogeneous equilibrium flow model and prior separated flow models and correlations yielded relatively poor predictions of pressure drop. A new correlation scheme is suggested that incorporates the effect of liquid viscosity and surface tension in the separated flow model's two-phase pressure drop multiplier. This scheme shows excellent agreement with the R134a data as well as previous micro-channel water data. An important practical finding from this study is that the throttling valve in a refrigeration cycle offers significant stiffening to the system, suppressing the large pressure oscillations common to micro-channel heat sinks (see also this Bulletin, reference 2005-1731).

Details

  • Original title: Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications. I. Pressure drop characteristics.
  • Record ID : 2005-1730
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 48 - n. 5
  • Publication date: 2005/02

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