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Entropy generation in a flow transitioning downstream of a rib

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.720
pages 672-682

Stefan Becker
Institute of Process Machinery and System Engineering (iPAT), Friedrich-Alexander University, D-91058 Erlangen, Deutschland

Donald M. McEligot
Aerospace and Mechanical Engineering Department, University of Arizona,Tucson, AZ 85721; Idaho National Laboratory (INL), Idaho Falls, ID 83415-3885, USA; and Institut für Kernenergetik und Energiesysteme, Universitat Stuttgart, Stuttgart, Germany

Edmond J. Walsh
Stokes Research Institute, Mechanical and Aeronautical Engineering Department, University of Limerick, Limerick, Ireland

Eckart Laurien
Inst. für Kernenergetik u. Energiesysteme (IKE), Uni. Stuttgart, D-70550 Stuttgart, Germany

Sinopsis

The entropy generation downstream of a two-dimensional square rib of height k+ ≈ 14.2 was deduced from laser Doppler velocimetry data. This flow involves interaction between the shear layer evolving over the rib and the transitioning wall boundary layer growing after reattachment. At the last station, x* = (x − xk)/k ≈ 138, deduced values of entropy generation rates agreed with expectations for developed turbulent boundary layers where a common approximate prediction technique becomes adequate. However, as with bypass transition, this technique overpredicted the integral entropy generation rate during transition since it neglects a term for convection of turbulent kinetic energy that is significant.

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