Investigation of accumulation and persistence time of ultrasonic striation grating of starch suspensions in liquids

Abstract

A quantitative study of the phenomena of accumulation of particles in stationary ultrasonic fields and the persistence of striation grating after stopping the ultrasonic waves, has been made with reference to its dependence on the particle size and the nature of the suspension employed. Observations of the variation of accumulation time with grain size are shown to be in agreement with the theoretical deductions from King's investigations of acoustic radiation pressure on spheres. The variation of persistence time with viscosity in Agar Agar sol as it sets to a gel and finally the formation of a permanent striation grating of starch suspensions in Agar Agar gel is also studied.