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Friction factor and heat transfer performance of an offset-strip fin array at air-side Reynolds numbers to 100,000.

Author(s) : MICHNA G. J., JACOBI A. M., BURTON R. L.

Summary

Offset-strip fin heat exchangers take advantage of boundary layer restarting to enhance heat transfer over that of plain-fin heat exchangers. Typically, these heat exchangers are operated at low Reynolds numbers (Re < 1,000). At higher Reynolds numbers, vortex shedding and turbulent flow in the array may cause further enhancement of heat transfer, but with an increase in pressure drop. The additional pumping power required at higher Reynolds numbers is unsuitable for conventional air conditioning and automotive applications. However, the compactness and low weight afforded by the high heat transfer coefficients is extremely attractive for some emerging aerospace applications, such as advanced air-breathing propulsion systems for space launch. Experiments have been undertaken to measure the heat transfer and friction factor of an offset-strip fin array at Reynolds numbers up to 100,000, and the results are discussed in this paper.

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Details

  • Original title: Friction factor and heat transfer performance of an offset-strip fin array at air-side Reynolds numbers to 100,000.
  • Record ID : 2008-2056
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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