Heat flux intensification by vortical flow localization in rotating convection

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Kunnen, R.P.J. and Clercx, H.J.H. and Geurts, B.J. (2006) Heat flux intensification by vortical flow localization in rotating convection. Physical Review E: Statistical, nonlinear, and soft matter physics, 74 (5). 056306. ISSN 1539-3755

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Abstract:The effect of rotation on turbulent convective flow between parallel plates has been assessed with direct numerical simulations. With increasing rotation-rate an interesting transition is observed in the vertical-velocity skewness. This transition indicates a localization of motion directed away from the wall and correlates well with changes observed in the heat flux, as well as in the thermal and viscous boundary layer thicknesses. The formation of localized intense vortical structures provides for intensified vertical heat transport through Ekman pumping. At higher rotation-rates this is counteracted by the inhibition of vertical motion by rotation as expressed in the geostrophic thermal-wind balance.
Item Type:Article
Additional information:PACS number(s): 47.27.te, 47.32.-y
Copyright:© 2006 American Physical Society
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/63904
Official URL:http://dx.doi.org/10.1103/PhysRevE.74.056306
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