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Condensation heat transfer of R-134a inside a microfin tube with different tube inclinations.

Author(s) : AKHAVAN-BEHABADI M. A., KUMAR R., MOHSENI S. G.

Type of article: Article

Summary

Experimental heat transfer studies during condensation of pure R-134a vapour inside a single microfin tube have been carried out. The microfin tube has been provided with different tube inclination angles of the direction of fluid flow from horizontal, alpha. The data are acquired for seven different tube inclinations, a, in a range of -90 to +90° and three mass velocities of 54, 81, and 107 kg/m2-s for each inclination angle during condensation of R-134a vapour. The experimental results indicate that the tube inclination angle of, alpha, affects the condensation heat transfer coefficient in a significant manner. The highest heat transfer coefficient is attained at inclination angle of alpha= +30°. The effect of inclination angle, alpha, on heat transfer coefficient, h, is more prominent at low vapour quality and mass velocity. A correlation has also been developed to predict the condensing side heat transfer coefficient for different vapour qualities and mass velocities. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Condensation heat transfer of R-134a inside a microfin tube with different tube inclinations.
  • Record ID : 2008-1220
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 50 - n. 23-24
  • Publication date: 2007/11

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