Fig. 8.

Comparisons of the modelled acoustic streaming velocities in the bulk of the fluid by two methods, the Reynolds stress method (RSM) and the limiting velocity method (LVM). POD_ $\overline{u_2}$ represents percentage of difference on the $x$-component acoustic streaming velocity, $\overline{u_2}$, at point ($-w/2$, 0). POD_ $\overline{u_2}=\left(\overline{u_{2l}}-\overline{u_{2r}}\right)/\overline{u_{2l}}$, where $\overline{u_{2l}}$ and $\overline{u_{2r}}$ are the streaming velocities obtained from the LVM and the RSM, respectively. ${\mathit{\delta }}_v$ is the thickness of the acoustic boundary layer