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RESEARCH PAPERS

The Structure of a Boundary Layer on a Rough Wall with Blowing and Heat Transfer

[+] Author and Article Information
M. M. Pimenta

Department of Mechanical Engineering, Universidade de Sao Paulo, Brasil

R. J. Moffat

Department of Mechanical Engineering, Stanford University, Stanford, Calif. 94305

W. M. Kays

School of Engineering, Stanford University, Stanford, Calif. 94305

J. Heat Transfer 101(2), 193-198 (May 01, 1979) (6 pages) doi:10.1115/1.3450945 History: Received August 28, 1978; Online August 11, 2010

Abstract

A regular, deterministic, rough surface was tested at four velocities from 11 to 40 m/s, with and without blowing, to evaluate the Stanton number and friction factor characteristics. Hot-wire data were taken to document the turbulence components, the Reynolds stresses, and the turbulent heat flux. Data are presented concerning the streamwise development of the mean and fluctuating components, and the effect of blowing. Correlation coefficients and mixing lengths were deduced from the hot-wire data and are also presented. While the mean velocity data showed only two allowable states for the boundary layer (laminar and “fully rough”), the turbulence structure indicated a third: “transitionally rough”. Distributions of u′ v′ /uτ 2 and v′ t′ /uτ tτ are similar, except for high blowing (F = 0.004). The turbulent Prandtl number lies between 0.85 and 1.0 for the entire layer, and a mixing length constant of κ = 0.41 describes the data with good accuracy for all velocities and all values of blowing tested.

Copyright © 1979 by ASME
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