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Augmented heat transfer in a recovery passage downstream from a grooved section: an example of uncoupled heat/momentum transport.

Author(s) : GREINER M., CHEN R. F., WIRTZ R. A.

Type of article: Article

Summary

Heat transfer, pressure, and velocity measurements in a flat passage downstream from a grooved region are used to study how the flow recovers once it is disturbed. The time-averaged and unsteady velocity profiles, as well as the heat transfer coefficient, are dramatically affected for up to 20 hydraulic diameters past the end of the grooved section. The recovery lengths for shear stress and pressure gradient are significantly shorter and decrease rapidly for Reynolds numbers greater than 3000. As a result, a 5.4-hydraulic-diameter-long recovery region requires 44% less pumping power for a given heat transfer level than if grooving continued.

Details

  • Original title: Augmented heat transfer in a recovery passage downstream from a grooved section: an example of uncoupled heat/momentum transport.
  • Record ID : 1996-2744
  • Languages: English
  • Source: J. Heat Transf. - vol. 117 - n. 2
  • Publication date: 1995/05
  • Document available for consultation in the library of the IIR headquarters only.

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