Please use this identifier to cite or link to this item: http://hdl.handle.net/11422/8781
Type: Artigo
Title: The distribution of wall shear stress downstream of a change in roughness
Author(s)/Inventor(s): Loureiro, Juliana Braga Rodrigues
Sousa, Fernanda Beatriz de Carvalho Cerveira de
Zotin, José Luiz Zanon
Freire, Atila Pantaleão Silva
Abstract: Indisponível.
Abstract: In the present work, six different experimental techniques are used to characterize the non-equilibrium flow downstream of a rough-to-smooth step change in surface roughness. Over the rough surface, wall shear stress results obtained through the form drag and the Reynolds stress methods are shown to be mutually consistent. Over the smooth surface, reference wall shear stress data is obtained through two optical methods: linear velocity profiles obtained through laser-Doppler anemometry and a sensor surface, the diverging fringe Doppler sensor. The work shows that the two most commonly used methods to determine the wall shear stress, the log-law gradient method and the Reynolds shear stress method, are completely inappropriate in the developing flow region. Preston tubes, on the other hand, are shown to perform well in the region of a non-equilibrium flow.
Keywords: Wall shear stress
Roughness
Turbulence
Laser-Doppler anemometry
Subject CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Elsevier
In: International Journal of Heat and Fluid Flow
Volume: 31
Issue: 5
Issue Date: 14-Jul-2010
DOI: 10.1016/j.ijheatfluidflow.2010.06.006
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 0142-727X
Appears in Collections:Engenharias

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