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Two-phase pressure drop and flow boiling heat transfer in an enhanced dimpled tube with a solid round rod insert.

Author(s) : AYUB Z. H., AYUB A. H., RIBATSKI G., et al.

Type of article: Article, IJR article

Summary

An experimental study was conducted on a 19.05?mm (outer diameter) dimpled enhanced tube to evaluate the in-tube two phase heat transfer and pressure drop performance in an annular section created between the enhanced tube and a solid round PVC rod. The purpose of the study was to understand the effect of forced early transition to annular flow on the pressure drop and heat transfer coefficient in a horizontal tube. The refrigerant studied was R-134a at a saturation temperature of 5?°C, heat flux range 2.5 to 15?kW m-2, mass flux from 80 to 200?kg?m-2?s-1 and inlet vapor quality of 0.12 to 0.72. Flow pattern and pressure drop results were obtained under adiabatic conditions. Under similar operating conditions the enhanced tube with a rod exhibited three times higher heat transfer performance versus same size smooth empty tube with lower pressure drop penalty at lower mas flux.

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Details

  • Original title: Two-phase pressure drop and flow boiling heat transfer in an enhanced dimpled tube with a solid round rod insert.
  • Record ID : 30021899
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 75
  • Publication date: 2017/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.01.008

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