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Modeling the influence of regular wall roughnesses on the heat transport

Shishkina, Olga and Wagner, Claus (2011) Modeling the influence of regular wall roughnesses on the heat transport. Journal of Physics: Conference Series, 318 (02), pp. 1-5. DOI: 10.1088/1742-6596/318/2/022034. ISSN 1742-6588.

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Official URL: http://iopscience.iop.org/1742-6596/318/2


We investigate the effect of regular wall roughness on the heat transport in thermal convection. The roughness is introduced by a set of rectangular heated/cooled obstacles located at the corresponding plates. An analytical model to estimate the Nusselt number deviations caused by the wall roughness is developed, which is based on the Prandtlâ��Blasius boundary layer equations and is valid for moderate Rayleigh numbers (kleiner ungef�¤hr 10 hoch 8) and a regular wall roughness, for which the height of the obstacles and the distance between them are significantly larger than the thickness of the thermal boundary layers. The model is validated in two-dimensional simulations, for different aspect ratios of the obstacles. It is found that the model predicts the heat transport with errors kleiner gleich 6% for all investigated cases.

Document Type:Article
Additional Information:Paper: 022034
Title:Modeling the influence of regular wall roughnesses on the heat transport
AuthorsInstitution or Email of Authors
Shishkina, OlgaOlga.Shishkina@dlr.de
Wagner, ClausClaus.Wagner@dlr.de
Journal or Publication Title:Journal of Physics: Conference Series
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:No
Page Range:pp. 1-5
Keywords:heat transfer, heat transport, wall roughness,
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugenergiesysteme (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: PD Dr. habil. Olga Shishkina
Deposited On:17 Jan 2012 12:06
Last Modified:26 Mar 2015 15:35

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