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Friction pressure drop of R12 in small hydraulic diameter extruded aluminum tubes with and without micro-fins.

Author(s) : YANG C. Y., WEBB R. L.

Type of article: Article

Summary

Adiabatic, single-phase liquid and two-phase flow pressure drop were measured for R12 flowing in both rectangular plain and micro-fin tubes with hydraulic diameters 2.64 and 1.56 mm, respectively. The single-phase liquid friction factors for the plain and micro-fin tubes are uniformly 14 and 36% higher, respectively, than that predicted by the Blasius equation. The paper shows that the pressure drop is dominated by vapor shear in both the plain and micro-fin tubes. Vapour shear effects in micro-fin tube do not cause significant disturbances in the two-phase flow. This observation provides additional evidence that the distinctly steep condensation heat transfer curves at low mass velocity and high vapour quality are caused by surface tension drainage force.

Details

  • Original title: Friction pressure drop of R12 in small hydraulic diameter extruded aluminum tubes with and without micro-fins.
  • Record ID : 1996-2176
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 39 - n. 4
  • Publication date: 1996/03

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