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Experimental and numerical study on heat transfer and pressure drop performance of Cross-Wavy primary surface channel

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Author

  • Ting Ma
  • Lin xiu Du
  • Ning Sun
  • Min Zeng
  • Bengt Sundén
  • Qiu wang Wang

Summary, in English

The Cross-Wavy primary surface heat exchanger is one of the most promising candidates for microturbine recuperators. In this paper, naphthalene sublimation experiments are performed for Cross-Wavy channels in a wind tunnel. The experimental results indicate that the entrance region has a small effect on the unit-averaged heat transfer coefficient of whole Cross-Wavy channels. Correlations of Nusselt number and friction factor in the Cross-Wavy channel are obtained. However, only the Cross-Wavy channel with a large equivalent diameter is tested because the actual Cross-Wavy channels are very complicated and small. Therefore, based on the similarity rules, five Cross-Wavy channels with similar structures but different equivalent diameters are further investigated by numerical simulations. The numerical results indicate that the Cross-Wavy channels with similar structures but different equivalent diameters have similar thermal-hydraulic performance in the studied Reynolds number range.

Department/s

Publishing year

2016-10-01

Language

English

Pages

80-90

Publication/Series

Energy Conversion and Management

Volume

125

Document type

Journal article

Publisher

Elsevier

Topic

  • Energy Engineering

Keywords

  • Cross-Wavy channel
  • Heat transfer
  • Naphthalene sublimation technique
  • Pressure drop
  • Similarity

Status

Published

ISBN/ISSN/Other

  • ISSN: 0196-8904