Turbulent heat and mass transfer through air curtains devices for the confinement of heat inside tunnels |
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Authors: | J. RiveraJ.C. Elicer-Corté s,M. Pavageau |
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Affiliation: | a Departamento de Ingeniería Mecánica, Universidad de Chile, Beauchef 850, Piso 5°, Santiago, Chileb Ecole des Mines d''Albi, Campus Jarlard, 81013 Albi Cedex 09, France |
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Abstract: | The influence of flow instabilities on the efficiency of a twin-jet air curtain formed by a cold stream parallel to a hot stream was studied. Two cases were considered: the Reynolds number and mean flow velocity of both streams were set to 1000 and 3 m/s, respectively. The results obtained from 3D LES simulations were compared with experimental data and earlier LES numerical results using the FDS code. Energy spectra exhibit decay laws with − 5/3 and − 3 slopes. Instabilities with a characteristic Strouhal number of about 0.4 were detected. Kelvin-Helmoltz type instabilities play a more significant role than the Görtler type instabilities present at the wall for applications of plane impinging jets to ambience separation. |
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Keywords: | Air curtains Impinging jets Double stream -twin jets Flow instabilities FDS Fluent |
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