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Air-side heat transfer enhancement by a v-formation delta-winglet array in a developing channel flow.

Number: pap. n. R3, 2484

Author(s) : HE J., JACOBI A. M.

Summary

Inspired by group movement of animals in nature, a new vortex generator (VG) array deployed in a “V” is proposed in this study, aiming to create constructive interference between vortices and improve VG performance. Its impact on surface convection enhancement is experimentally assessed in a developing channel flow. A large-aspect-ratio duct of 6 mm high is constructed to model a single passage of plain-fin heat exchangers. The frontal air velocity ranges from 0.9 to 2.5 m/s, corresponding to a Reynolds number range based on channel height of 340 to 940. The proposed V-array demonstrates superiority to a conventional multi-row configuration in that it affects a much larger heat transfer area, and the boost effect by the trailing pair is manifest even at relatively small Reynolds numbers. A two-pair V-array deployed at 30º yields 12-36% augmentation in the total heat transfer for the current channel flow, and is considered an appropriate design for implementation in prototype heat exchangers.

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Pages: 8 p.

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Details

  • Original title: Air-side heat transfer enhancement by a v-formation delta-winglet array in a developing channel flow.
  • Record ID : 30000490
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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