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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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Official URL: http://journals.cambridge.org


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.

Document Type:Article
Title:Modelling the wall roughness influence on the heat transfer in thermal convection
AuthorsInstitution or Email of Authors
Shishkina, OlgaOlga.Shishkina@dlr.de
Wagner, ClausClaus.Wagner@dlr.de
Journal or Publication Title:Journal of Fluid Mechanics
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 686
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:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
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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