Mass transfer between solid spheres and oscillating fluids — A critical review

Relative oscillatory motion between solid particles and a fluid increases the rate of interphase mass transfer due to the establishment of secondary flows (acoustic streaming). A critical survey of published data shows that mass transfer is well correlated by a theoretically founded dimensionless relation of the form where K, a, b and d depend on the Schmidt number. The equation successfully correlates experimental data for both gases and liquids over a range of frequencies F < 1 Hz to F ⋍ 106 Hz, provided the amplitude to diameter ratio A/D is below 0.75. At higher values of this parameter, NSh is better predicted by a quasi‐steady model which no longer depends on A/D. Based on a paper presented at the 26th Canadian Chemical Engineering Conference, Montreal, Quebec, November 2–5, 1975.