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Impact of blockage ratio on performance enhancement in the presence of delta winglet vortex generators.

Number: CD-YR2-1045

Author(s) : YANINGSIH I., WIJAYANTA A. T., MIYAZAKI T., et al.

Summary

The impact of blockage ratio (RB) on convective heat transfer and friction behaviors in a tube equipped with the double-sided delta-winglet tape insert (DWTs) was investigated experimentally. Two blockage ratio (RB = 0.28 and 0.35) were proposed in this study. The effect of parameters was compared with the result of longitudinal strip (L-S) and plain tube under similar flow conditions. Investigations were conducted at Reynolds number (Re) 5500 - 14,500. The results revealed that for employing the DWTs and L-S, the increase in the Nusselt number (Nu) and friction factor up to 318.2% and 13.4 times of plain tube and the highest thermal performance (n) is 1.3. The results also showed that thermal performance increased with the increase of RB.

Details

  • Original title: Impact of blockage ratio on performance enhancement in the presence of delta winglet vortex generators.
  • Record ID : 30023163
  • Languages: English
  • Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Publication date: 2017/08/07

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