INTERACTION FORCE BETWEEN A BUBBLE AND A SOLID PARTICLE IN A SOUND FIELD

The time-averaged interaction force exerted by a sound field between a gas bubble and a solid spherical particle is examined. An approach is developed allowing the force to be calculated for small separations b etween the bubble and the particle. The results obtained are compared with the existing asymptotic equation derived for large separations. I t is shown that when the bubble and the particle are closely spaced, b oth the magnitude and the sign of the force are different from those p redicted by the asymptotic equation, resulting in new interesting effe cts.