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Flow patterns, heat transfer and pressure drop for evaporation and condensation of R134A in microfin tubes.

Author(s) : COLOMBO L. P. M., LUCCHINI A., MUZZIO A.

Type of article: Article, IJR article

Summary

Experiments on flow boiling and convective condensation for oil-free R134a were performed with three 9.52 mm outer diameter tubes (two microfined and one smooth) horizontally operated and heated or cooled by a water stream. Microfin tubes have sharp fins (apex angle 40°) alternating with two different heights whereas the fin number is different (54 and 82). For evaporation (5°C nominal temperature) test conditions were set as: mass flux 100÷340 kg (m2/s), inlet quality 0.25÷0.70, quality change 0.10÷0.70; for condensation (35°C nominal temperature): mass flux 100÷440 kg (m2/s), inlet quality 0.75÷0.10, quality change 0.10÷0.70. Average heat transfer coefficients and pressure drop were measured. Furthermore, a visual inspection was performed to characterize how fins affect the flow pattern transitions. Finally, experimental data and prediction of well-known correlations proposed for these tubes were compared.

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Pages: 2150-2165

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Details

  • Original title: Flow patterns, heat transfer and pressure drop for evaporation and condensation of R134A in microfin tubes.
  • Record ID : 30005966
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 8
  • Publication date: 2012/12

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