NUMERICAL INVESTIGATION OF THE FLOW FIELD OF A CONFINED TURBULENT IMPINGING JET

The paper presents results of numerical simulation, using a control volume based finite difference method, of the flow-field due to an axial turbulent impinging jet into parallel discs. Both high-Reynolds and low-Reynolds number (Launder-Sharma) versions of k−ε turbulence models were used The parameters studied were the jet Reynolds number (4000<Re<23000) and nozzle-to-impingement surface spacing (1=H/D<4). The low-Reynolds model presented by Launder-Sharma shows better agreements with the experimental data of Fitzgerald and Garimella (1998) for mean velocity profiles. Discrepancy over turbulence intensity is obvious as obtained by Craft et al (1993) in the case of unconfined jet using same turbulence models.