Diffusion From a Line Source Located in a Boundary Layer

Mean temperatures are studied in a wind tunnel downstream of a line source (heated wire) located in a turbulent boundary layer. Measurements are made successively at four distances from the wall. Longitudinal evolution of mean temperatures are presented. Analysis of experimental results indicates a...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1981-01, Vol.24 (7), p.1105-1117
Main Authors: Paranthoen, P, Trinite, M
Format: Article
Language:eng ; fre
Subjects:
boundary layers
Engineering Sciences
fluid mechanics
Reactive fluid environment
thermodynamics
wind tunnels
Online Access:Get full text
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Summary:Mean temperatures are studied in a wind tunnel downstream of a line source (heated wire) located in a turbulent boundary layer. Measurements are made successively at four distances from the wall. Longitudinal evolution of mean temperatures are presented. Analysis of experimental results indicates a strong influence of the position of the source on diffusion. Peak value temperatures as a function of downstream distance is fitted with power laws. Good agreement is found with Shlien and Corrsin measurements. The lagrangian turbulent Parandtl number defined by Shlien and Corrsin is in the ranger from 0.8 to 1.7. Comparison with the usual turbulent Prandtl number shows some difference when the source is located near the wall. The lagrangian integral scale is found of the same order as the eulerian integral time scale of the vertical velocity fluctuation in an "optimum" convected frame.
ISSN:0017-9310
DOI:10.1016/0017-9310(81)90160-5