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Experimental investigation of turbulence-driven secondary motion on a streamwise external corner

Moinuddin, Khalid A. M and Joubert, P. N and Chong, M. S (2004) Experimental investigation of turbulence-driven secondary motion on a streamwise external corner. Journal of Fluid Mechanics, 511. pp. 1-23. ISSN 0022-1120

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Abstract

Turbulence-driven secondary motion (known as secondary flow of Prandtl's second kind) is the result of the anisotropy of Reynolds stresses. It is associated with internal or external turbulent flow in the vicinity of streamwise corners. In the last six decades the flow along the streamwise internal corner has attracted the attention of many researchers, but it is only recently at the University of Melbourne that an experimental investigation on a flow over an external corner has been undertaken. Although the turbulence-driven secondary motions are generally much smaller than those resulting from skewing of the mean spanwise vorticity (known as secondary flow of Prandtl's first kind), they have a pronounced effect on peripheral wall shear stress distributions and heat transfer rates in the corner region. In the present study the details of turbulence-driven secondary motion over the external corner are explored experimentally and a counter-rotating helical streamwise vortex pair symmetrically placed around the corner bisector is found. As expected, all mean velocity and Reynolds stress profiles on both surfaces at the same spanwise distance from the corner agree quite well, having nominal deviation. The secondary flow is observed to be directed away from the corner bisector and then flow back towards the wall. It is also revealed that far from the corner, the flow develops as a nominal two-dimensional flat-plate boundary-layer flow.

Item Type: Article
Uncontrolled Keywords: experimental study, turbulence structure, velocity distribution, vortex pair, Reynolds stress, anisotropy, wedge, external flows, turbulent flow, secondary flow
Subjects: RFCD Classification > 300000 Agricultural, Veterinary and Environmental Sciences
Faculty/School/Research Centre/Department > Centre for Environmental Safety and Risk Engineering (CESARE)
Depositing User: Ms Phung T Tran
Date Deposited: 25 Nov 2008 00:18
Last Modified: 11 Jul 2011 02:18
URI: http://vuir.vu.edu.au/id/eprint/1886
DOI: 10.1017/S0022112004008742
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