Colloid particle adsorption in the slot impinging jet cell

A detailed description of flow distribution in the slot impinging jet cell (SIJ) is presented. Numerical solutions of the governing Navier-Stokes equa tion showed that for Re < 30 the flow resembles closely the one occurring n ear a cylinder placed in a uniform how, It was also shown that for tangenti al distances x/d < 0.25 the flow configuration in the vicinity of the solid can be approximated by the plane-parallel stagnation flow with the perpend icular velocity component independent of this distance. This flow field was used for deriving the mass transfer equation, which was then numerically s olved to obtain the initial flux (adsorption rate) for various transport co nditions, These theoretical predictions were verified experimentally using polystyrene latex particles of the size 1 and 1.48 mu m A good agreement be tween predicted and measured initial flux values was found for a broad rang e of Reynolds number and ionic strength of the particle suspension. This co nfirmed that the SIJ cell surface was uniformly accessible for particles at distances x/d < 0.5, At larger distances a systematic deviation from unifo rm deposition rates was observed, becoming important for higher coverages a nd Re. This effect was attributed to the hydrodynamic scattering of adsorbi ng particles on particles already attached to the surface, This phenomenon was quantitatively accounted for by the Brownian dynamics type simulations, (C) 1999 Academic Press.