Volume 17, No. 3, 2020
The Couple Of Spherical Particles In A Liquid Show To A Standing Bulk Acoustic Wave (B.A.W).
Shashi Shekhar Vidyarthi
Abstract
The interparticle force between two particles exposed to a standing bulk acoustic wave and suspended in a liquid is clarified. By deducting the time-averaged primary radiation force caused by the effect of scattering from the time-averaged total radiation force caused by the combined scattering and re-scattering effects, a three-dimensional model based on the perturbation technique and tensor integral method is used to predict the interparticle force. The findings demonstrate that the interparticle force is attractive, symmetric, and scales with the product of wavenumber (k) and interdistance regardless of the sizes of the particles at the nodal plane. We discover that the interparticle force is dependent on the horizontal (parallel to the nodal plane) and vertical interdistances by examining the interparticle force between two particles that are not on the nodal plane. Our findings demonstrate that the conflict between time-averaged second-order pressure and velocity terms causes the interparticle force to switch from attractive to repulsive at a crucial interdistance. We exposed that the interparticle force is unaffected by the separation between two particles that are parallel to the nodal plane. We present a method for the experimental measurement of the interparticle force and consider the total radiation force as the sum of the interparticle force, axial primary force, and drag force. The interparticle force predicted by the model agrees well (within 5%) with the experimental results. Our research clarifies interparticle forces, enabling more precise calculation of forces acting on particles in an acoustic field.
Pages: 191-198
Keywords: piezoelectric transducer, interparticle force, bulk acoustic wave.