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An LES insight into the flow structure and heat transfer in a round impinging jet

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.870
pages 433-436

Muhamed Hadziabdic
Faculty of Engineering and Natural Sciences, International University of Sarajevo, Bosnia and Herzegovina; and Department of Applied Physics, Delft University of Technology, Prins Bernhardlaan 6, 2628 BWDelft, The Netherlands

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Abstrakt

Large-eddy simulations of a round impinging jet have been performed aimed at gaining a better insight into flow and turbulence structure and their imprints on the heated target wall. The Reynolds number Re = 20000 and the orifice-to-plate distance H/D = 2, where D is the jet-orifice diameter, were chosen to match the experiments of Baughn and Shimizu [1] (also Cooper et al. [4], and Geers et al. [5]). The simulations, performed with the in-house unstructured finite-volume code T-FlowS, confirmed the experimentally detected double peaks in the Nusselt number and the negative production of turbulence energy in the stagnation region. The LES revealed also some other phenomena such as a strong jet flapping around the stagnation point and the unsteady flow separation at the onset of the wall-jet formation. These events seem to be the main cause of the Nu-number nonuniformity, and are linked to the break-up of the shear-layer-generated ring vortices prior or after their impingement.

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