Response of fully developed pipe flow to a wall-attached ring-type roughness element

The flow field downstream of a wall-attached roughness element in heated axisymmetric flow has been examined experimentally. Velocity and temperature fluctuations at selected points were examined for sensitivity to changes in position relative to the disturbance. Results indicate that the turbulent...

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Bibliographic Details
Published in:Nuclear engineering and design 1982-01, Vol.70 (2), p.253-260
Main Authors: Bremhorst, K., Bullock, K.J.
Format: Article
Language:English
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Summary:The flow field downstream of a wall-attached roughness element in heated axisymmetric flow has been examined experimentally. Velocity and temperature fluctuations at selected points were examined for sensitivity to changes in position relative to the disturbance. Results indicate that the turbulent Prandtl number in the downstream flow field is in the range 0.4–1.2, that large Reynolds stresses are generated near the tip of the roughness element but diffuse towards the core with downstream distance, and that spectral peaks exist which decay rapidly with downstream distance. The restraining effect of the wall on the lateral turbulence intensity is also well illustrated. The rapidly changing features of the flow with downstream distance from the flow disturbance open up possibilities for monitoring of reactor fuel assemblies as well as in-service location of faults.
ISSN:0029-5493
1872-759X
DOI:10.1016/0029-5493(82)90204-7