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DOI: 10.1615/ICHMT.2008.CHT.1800
page 22

M. Popovac
Department of Multi Scale Physics and J. M. Burgerscentre for Fluid Dynamics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, 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


Large-eddy simulations have been performed to study conjugate heat transfer on a jet-impinged wall-mounted cube placed in the middle of an in-line array in a channel flow. The heat is generated electrically in the cube copper core, conducted through the protective low-conducting epoxy layer, and then removed from the outer surface of the cube simultaneously by the bulk ("cross") flow in the channel characterised by Rec = 4800, and an upstream-displaced normally impinging round jet at Rej = 5200. Apart from the cubic shape (adopted on purpose to serve as a reference for comparison and further studies), the configuration mimics in all respects the cooling of electronic components. It is also relevant to internal cooling of gas-turbine blades and many other heat transfer applications. The interaction of the two streams and the cube leads to the formation of complex vortical structures that govern heat removal from the cube surface. The strongest and the most evenly distributed cooling were found on the cube top and front face. The heat flux on the side face is lower in the zones where the flow separates, while it increases downstream where a fresh fluid from the cross-flow flushes the face. The separation on the back face of the cube creates an arch vortex, which dictates the heat transfer from that face. Despite its persistence and relative steadiness, significant nonuniformity of the temperature field has been detected on that face, characterised by a time meandering of the hot spots. The vortex rings, created in the jet shear layer before its impact on the cube, break up upon impingement, leading to the re-establishing of the thermal boundary layer, and consequent enhancement of heat transfer.

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