High Schmidt mass transfer in a turbulent impinging slot-jet flow

High Schmidt number mass transfer to a line electrode in turbulent impinging slot-jet flows is investigated. Slot-based Reynolds numbers from 13 000 to 40 000 are considered. The mass transfer measurements, made by the electrochemical method on 100-micron electrodes, are compared to the computed wall shear via an established analytical relationship. The local shear is estimated from two-dimensional flow-field simulations of the Reynolds averaged Navier-Stokes equations. The kappa-<(<omega>)over bar> turbulence model [1] was used to calculate the turbulent eddy viscosity, v(t). The present measurements resolve the sharp variations in mass transfer in the stagnation region. Both the experimental and theoretical results show that the peak values in Nusselt number occur at a point about one jet width away from the stagnation point. (C) 2001 Elsevier Science Ltd. All rights reserved.