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Related Experiment Videos

Mach number effect on jet impingement heat transfer.

P Brevet1, E Dorignac, J J Vullierme

  • 1Laboratoire d'Etudes Thermiques (UMR CNRS 6608) ENSMA, Teleport 2, BP 40109, 86961 FUTUROSCOPE, France.

Annals of the New York Academy of Sciences
|July 20, 2001
PubMed
Summary

This study investigates heat transfer from a single round free jet impinging on a flat plate. It found that varying the injection Mach number (M) while keeping the Reynolds number (Re) constant allows direct evaluation of Mach number

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Area of Science:

  • Heat Transfer
  • Fluid Dynamics
  • Aerodynamics

Background:

  • Understanding heat transfer is crucial for designing efficient cooling systems.
  • Jet impingement is a widely used cooling technique in various industries.

Purpose of the Study:

  • To experimentally investigate heat transfer from a single round free jet impinging normally on a flat plate.
  • To evaluate the influence of the injection Mach number (M) on jet impingement heat transfer.
  • To develop a correlation for the average Nusselt number.

Main Methods:

  • Infrared measurements were used to characterize local and averaged heat transfer coefficients and Nusselt numbers.
  • Experiments were conducted with varying nozzle diameters (3-15 mm) to alter the Mach number (M) while maintaining a constant Reynolds number (Re).

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  • Adiabatic wall temperature was used as the reference temperature for heat transfer coefficient calculations.

    • Main Results:

    • Local and averaged heat transfer coefficients and Nusselt numbers were determined.
    • The influence of Mach number on jet impingement heat transfer was directly evaluated.
    • A correlation for the average Nusselt number was obtained from the experimental data.

    Conclusions:

    • The study provides valuable data for optimizing jet impingement cooling.
    • The developed correlation can be used to predict heat transfer performance.
    • Mach number is a significant parameter influencing jet impingement heat transfer.