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Related Experiment Videos

Comparison between two models of cooling surfaces using blowing.

L Mathelin1, F Bataille, A Lallemand

  • 1Institut National des Sciences Appliquées de Lyon Centre de Thermique de Lyon, UMR 5008 Bât. 404, 20 av. A. Einstein, 69621 Villeurbanne, France.

Annals of the New York Academy of Sciences
|July 20, 2001
PubMed
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Blowing air through porous materials effectively protects surfaces from high temperatures by altering boundary layers and reducing heat transfer. This method lowers viscous drag and thermal stress for enhanced thermal protection.

Area of Science:

  • Fluid dynamics
  • Heat transfer
  • Materials science

Background:

  • Surface protection against high temperatures is crucial in many engineering applications.
  • Porous materials offer potential for advanced thermal management solutions.
  • Understanding the impact of blowing on thermal and dynamical profiles is key.

Purpose of the Study:

  • To numerically investigate the effectiveness of blowing through a porous material for surface thermal protection.
  • To analyze the influence of blowing on dynamical and thermal boundary layers in a circular cylinder cross-flow geometry.
  • To compare simulation models with experimental data for validation.

Main Methods:

  • Numerical simulation of fluid flow and heat transfer with blowing.
  • Development of two distinct blowing simulation models.

Related Experiment Videos

  • Experimental validation using a heated wind-tunnel setup.

    • Main Results:

    • Blowing significantly alters surface dynamical and thermal profiles.
    • Boundary layers are thickened, leading to decreased external transfer coefficients.
    • Viscous drag and thermal stress are reduced.
    • Wall temperature and heat flux are substantially decreased by blowing.

    Conclusions:

    • Surface blowing through porous materials is an effective thermal protection strategy.
    • The study provides validated numerical models for predicting blowing effectiveness.
    • Results indicate significant reductions in heat transfer and associated stresses, with implications for material durability and performance.