Abstract
The cooling of porous plates by air blowing is studied experimentally. The ine uences of the air injection rate, of the hot main e ow temperature, and of the internal heat exchange surfaces of porous media are determined. The experiments show high efe ciency for this cooling process, about 97%. Because of the radiative heat transfer occuring withinthetestsection,a largeinjectionrate (about5%)isrequired toreachsuch an efe ciency.Thecritical injection rate is highlighted. Beyond that value the convective heat transfer does not exist any more because the boundary layer is blown off. Our heat transfer model of the porous plate and its vicinity (convective and radiative transfer)emphasizes important temperaturegaps between the solid phase and the e uid phaseoftheporousmedia. Fitting the model with the experimental data permits an estimate of the internal heat transfer coefe cients.
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