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Experiments on condensation heat transfer and visualization of flow pattern with R1234ze(E) inside horizontal 4 mm small-diameter microfin tubes.

Number: pap. n. 1303

Author(s) : HIROSE M., JIGE D., INOUE N.

Summary

In this study, we investigate the visualization of flow pattern of R1234ze(E) at the outlet of three types of horizontal microfin tubes, each with an outer diameter of 4 mm. The flow patterns observed during condensation were classified into three types, namely, annular, wavy, and slug flows. The annular flow was not observed at a mass velocity of 50 kgm-2s-1 in any of the test tubes. The difference of the transition line for annular-wavy flows was small for all the tubes, and the effect of fin geometry on flow pattern transition was small. Moreover, we propose a new correlation for the condensation heat transfer coefficient considering the effects of fin geometries and flow pattern on the condensation heat transfer. The proposed correlation agreed well with the measured heat transfer coefficient of R1234ze(E) within ±30%.

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Pages: 8

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Details

  • Original title: Experiments on condensation heat transfer and visualization of flow pattern with R1234ze(E) inside horizontal 4 mm small-diameter microfin tubes.
  • Record ID : 30026097
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1303

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