Darren L. Hitt
Andrea Prosperetti
Dept. of Mech. Eng., Johns Hopkins Univ., Baltimore, MD 21218
Previous experimental work on the dynamics of acoustically levitated gas bubbles [Crum and Prosperetti, J. Acoust. Soc. Am. 73, 121--127 (1983)] has shown a discrepancy between the theoretical and measured values of the levitation number, Le = (rho)[sub l]g/|(cursive beta)p|, in the nonlinear regime of oscillation. In an attempt to reconcile these differences, the existing inviscid theory is extended to include the effects of viscous drag forces in the dynamic equilibrium of the bubble. [Work supported by NSF.]