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Research Papers

Experimental Investigations of an Internal Flow Generated by Porous Injection

[+] Author and Article Information
Clarisse Fournier, Marc Michard

CETHIL-UMR CNRS 5008, INSA Lyon, Bat Sadi Carnot, 20 av. Albert Einstein, 69621 Villeurbanne Cedex, France

Françoise Bataille1

PROMES-UPR CNRS 8521, Rambla de la Thermodynamique, Tecnosud, 66100 Perpignan, Francefrancoise.daumas-bataille@univ-perp.fr

1

Corresponding author.

J. Appl. Mech 77(2), 021020 (Dec 21, 2009) (7 pages) doi:10.1115/1.3197140 History: Received March 27, 2008; Revised July 01, 2009; Published December 21, 2009; Online December 21, 2009

An anisothermal channel flow generated by a porous injection is investigated in details for different Reynolds numbers of the injection in order to highlight the impact of the microstructure of porous material on the flow development. Two types of porous materials, being characterized by different matrices and pore sizes are studied: a coarse bronze porous plate (30% porosity and 100μm average pore diameter) and a stainless steel porous plate (30% porosity and 30μm average pore diameter). Particle image velocimetry, hot-wire anemometry, and cold wire thermometer measurements lead to the comparison of mean profiles, rms profiles, and energy spectra for the velocity and temperature fields. Two-point spatial correlations for the fluctuating velocity are also calculated. In the case of the coarse bronze plate, the flow is slightly fluctuating with big space coherence. In the opposite, the results obtained with the fine pore plate show a flow close to a fully developed turbulent channel flow. The comparison of the aerodynamic field with computational simulations based on a Reynolds-averaged Navier-Stokes (RANS) model underlines the difficulties to reproduce exactly the evolution of the mean and fluctuating velocities in all the explored part of the channel.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Streamlines – –:Rein=1 and —:Rein=1000

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Figure 2

Experimental setup

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Figure 3

Principle of PIV measurement

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Figure 4

Instantaneous velocity field at x/e=26 for Rein=189

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Figure 6

Mean longitudinal velocity profiles: x/e=26

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Figure 7

RMS velocity profiles: x/e=26

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Figure 8

Energy spectra: x/e=46, y/e=0.65, and z/e=0

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Figure 9

Coefficients of correlation of the velocity fluctuation for the coarse bronze plate at the point x/e=26, y/e=0.54, and z/e=0

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Figure 10

Coefficients of correlation of the velocity fluctuation for the stainless steel plate at the point x/e=26, y/e=0.54, and z/e=0

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Figure 11

Spatial length: Rein=220 and x/e=41

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Figure 12

Mean velocity profiles for Rein=94

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Figure 13

RMS velocity profiles for Rein=94

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Figure 14

Left: mean temperature profiles at x/e=46; right: RMS temperature profiles at x/e=46

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Figure 15

Spectral densities of temperature

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