where τ = 2π ω is the period of oscillation, with angular frequency ω. The Gor'kov potential is derived under the assumption that boundaries are far away from the region of interest, which is not the case here. However, experimental studies revealed, that the theory should be valid up to close proximity of the embedded microbubble. In acoustofluidics, the acoustic energy density is often used as a benchmark for the device's performance and, therefore, used in our numerical analysis. The average acoustic energy density E ac is given as 24