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Predicting equations for evaporation pressure drop inside horizontal smooth and grooved tubes.

[In Japanese. / En japonais.]

Author(s) : KUBOTA A., UCHIDA M., SHIKAZONO N.

Type of article: Article

Summary

These tubes had an outer diameter of 7 mm, and the working fluids were R407C and R410A. The previous and present experimental data were correlated by the Lockhart-Martinelli method. Different numerical constants were adopted for smooth and grooved tubes to calculate the Lockhart-Martinelli pressure parameter. In order to express the gravitational effect, a damping function was introduced. The proposed damping function was expressed as a function of the Froude number for both smooth and grooved tubes. 95% of the predicted results are within the accuracy of plus or minus 30% for both smooth and grooved tubes.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2002-2263
  • Languages: Japanese
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 18 - n. 4
  • Publication date: 2001
  • Document available for consultation in the library of the IIR headquarters only.

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