HIGH PECLET NUMBER MASS-TRANSFER IN THE ACOUSTIC STREAMING-FLOW BETWEEN 2 CONCENTRIC CYLINDERS

Local and average convective diffusive mass transfer rates are analyze d numerically for high Peclet number acoustic streaming flow between t wo concentric cylinders. The streaming flows analyzed are for low to m oderate streaming Reynolds numbers, where counter-rotating inner and o uter recirculating flow cells exist. Thin concentration boundary layer s form at the inner cylinder surface, across the streamline that divid es the inner and outer flow cells, and at the outer cylinder surface. The core of each recirculating flow cell contains a well-mixed region of nearly uniform composition. The numerical results are used to devel op Sherwood number correlations that relate convective mass transfer r ates to dimensionless forms of the oscillation amplitude, oscillation frequency, and physical properties of the system. Numerical results ar e shown to agree with published experimental results. (C) 1997 Elsevie r Science Ltd.