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Jet impingement heat transfer in a frost-free refrigerator: the influence of confinement.

Author(s) : IMRAAN M., SHARMA R. N.

Type of article: Article, IJR article

Summary

Heat transfer characteristics of a slot air jet impinging on a circular cylinder located 5d from the jet exit in a confined space have been studied for Reynolds number (based on cylinder diameter and mean jet velocity) in the range of 1000-12,000. This situation is found in a frost-free refrigerator, amongst other rapid food refrigeration applications. The results reveal that the slot jet impinging on a circular cylinder in a confined space yields heat transfer rates that are between those for the corresponding uniform cross-flow (lower limit) and slot jet impingement on a non-confined cylinder (upper limit) cases. A dimensionless confinement spacing H/d = 10 was found at which the heat transfer rate was a minimum. CFD analysis revealed that this was due to periodic jet flapping and generation of large flow structures between the cylinder and the confining wall.

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Pages: 515-523

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Details

  • Original title: Jet impingement heat transfer in a frost-free refrigerator: the influence of confinement.
  • Record ID : 2009-0647
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 3
  • Publication date: 2009/05

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