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Article dans une revue
Convection in a vertical channel
Abstract : The flow generated by heat convection in a long, vertical channel is studied by means of particle imagery velocimetry techniques, with the help of the thermal measurements from a previous paper (Gibert et al 2009 Phys. Fluids 21 035109). We analyse the mean velocity profiles and the Reynolds stresses, and compare the present results with the previous ones obtained in a larger cell and at a larger Reynolds number.We calculate the horizontal temperature profile and the related horizontal heat flux. The pertinence of effective turbulent diffusivity and viscosity is confirmed by the low value of the associated mixing length. We study the one-point and two-point statistics of both velocity components. We show how the concept of turbulent viscosity explains the relations between the local probability density functions (pdf) of fluctuations for temperature, vertical and horizontal velocity components. Despite the low Reynolds number values explored, some conclusions can be drawn about the small scale velocity differences and the related energy cascade.
Littérature citée [9 références]
https://hal.archives-ouvertes.fr/hal-00566067
Contributeur : Publications Lmfa <>
Soumis le : mercredi 30 novembre 2011 - 14:54:30
Dernière modification le : mercredi 8 juillet 2020 - 12:42:06
Archivage à long terme le : : jeudi 1 mars 2012 - 02:20:15
Contributeur : Publications Lmfa <>
Soumis le : mercredi 30 novembre 2011 - 14:54:30
Dernière modification le : mercredi 8 juillet 2020 - 12:42:06
Archivage à long terme le : : jeudi 1 mars 2012 - 02:20:15
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NJP075024.pdf
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