Acoustical Streaming in the Vicinity of a Sphere

Abstract

Recent studies have led to a satisfactory understanding of the details of acoustical streaming in the vicinity of a cylinder. Similar studies have now been completed for a sphere. In general, the steady flow around a sphere and the characteristic parameters are very much like what has been found for the cylinder. An experimental verification of the theory has been attempted by comparing the observed dc boundary‐layer thickness with that found from the theory. This is summarized in a curve of δdc/δac vs a/δac, where δdc is the dc boundary‐layer thickness, δac is the ac boundary‐layer thickness, and a is the radius of the sphere.