Abstract
A technique that involves the use of a cylindrical insert to increase the heat-transfer rate in an impinging plane jet is studied using Large-Eddy Simulations. Results are presented for a plane impinging jet without an insert and for a jet with an insert, both at Reynolds number (based on the bulk inlet velocity and nozzle width) of 20,000 and with the target wall at a distance of four nozzle widths from the outlet. The secondary peak in the Nusselt number, which is characteristic of this flow, was obtained in the case where no insert was present, but was much diminished in the presence of the insert. Contours of the second invariant of the mean-velocity tensor are presented to better understand the role of coherent structures and their influence on heat transfer.
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