Modelling the wall roughness influence on the heat transfer in thermal convection
Shishkina, Olga and Wagner, Claus (2011) Modelling the wall roughness influence on the heat transfer in thermal convection. Journal of Fluid Mechanics, Vol. 686, pp. 568-582. Cambridge University Press. DOI: 10.1017/jfm.2011.348.
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The work is devoted to investigation of the heat transport in thermal convection, enhanced by the roughness of heated/cooled horizontal plates. The roughness is introduced by a set of rectangular heated/cooled obstacles located at the corresponding plates. Based on the boundary layer equations, a new analytical model for the estimation of Nusselt number deviations caused by the wall roughness is developed and presented. For validation of this model, the transport of heat and momentum in rectangular convection cells is also studied numerically, for different aspect ratios of the obstacles, the height of which is significantly higher than the thickness of the thermal boundary layers.
|Title:||Modelling the wall roughness influence on the heat transfer in thermal convection|
|Journal or Publication Title:||Journal of Fluid Mechanics|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 568-582|
|Publisher:||Cambridge University Press|
|Keywords:||Turbulent Rayleigh--B\'enard convection, heat transfer, wall roughness numerical simulations, Nusselt number|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flight Physics|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Fluid Systems|
|Deposited By:||PD Dr. habil. Olga Shishkina|
|Deposited On:||28 Nov 2011 15:29|
|Last Modified:||07 Feb 2013 20:30|
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