Simulation of turbulent flows in an impingement dryer by an extended kappa-epsilon model

Results of numerical simulation of 2D and 3D how held in a single slot jet discharging tangentially into a confined cylinder are presented. This geome try is relevant to new impingement dryers. An extended ic-E turbulence mode l with a near-wall function treatment is used to simulate turbulent jet flo ws. A finite element weighted residual method is used to solve the governin g mars, momentum, turbulent kinetic energy and turbulent kinetic energy dis sipation equations. The computations were performed for the Reynolds number ranging from 3200 to 31900. Slot width is varied from 0.5 to 1.0 cm. To ve rify the algorithm, numerical tests were performed to ensure that the solut ions were "grid independent". The mesh was constructed with four-node quadr ilateral elements. Flow fields, velocity profiles, jet trajectories, recirc ulating flows and geometry effects were investigated. Recirculating hows we re found for Reynolds lower than 6300. Desired velocity profiles were found for Reynolds upper than 15000 with slot width of 1.0 cm. (C) 2000 Elsevier Science S.A. All rights reserved.