ASA 125th Meeting Ottawa 1993 May

4pPA4. Viscous effects in the acoustic levitation of gas bubbles.

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.]