An analytical theory has been developed to calculate microstreaming velocity around a suspended sphere caused by oscillating bubbles in an unbounded viscous liquid. It has been demonstrated that the interaction of a bubble and a rigidity sphere can affect the magnitude and direction of acoustic streaming, especially for tangential components around the rigidity sphere. When the θ１(a component of spherical coordinates originates at the center of the rigidity sphere) varies in a period of π, The magnitude of tangential velocity around the suspended particle reaches the maximum at θ1=π/2.The velocity around the rigidity sphere is related to the relative position of medium. The increment of neighboring bubble radius makes acoustic streaming stronger, while the increment of distance between a bubble and a rigidity sphere induce the acoustic while the increment of distance between a bubble and a rigidity sphere induce the acoustic streaming weaker.

acoustic streaming; suspended spheres; bubble; cavitation