Methods
Simulations were conducted as axisymmetric models (2D interface) in COMSOL multiphysics 5.4. To find model dimensions, the sonication tubes were dismantled, and height, thickness, and width were measured with slide calipers. The model was then drawn directly in the COMSOL computer aided design interface with specified acoustic and flow boundary conditions (Fig 7, Table 1,2,3). The sonication tubes as well as tips are cylindrical and can be represented by taking half of the cross section along the mid plane (axisymmetric geometry). Finite element analysis demands the simulation domain to be discretized to number of elements, and the solution is obtained at each of the nodes.