  The efficient mixing of fluid samples in miniaturized total analysis systems
is essential for numerous applications including biological screening assays,
chemical extraction, polymerization, cell analysis, and protein folding.
Miniaturized microfluidic platforms have recently emerged for microscale fluid
mixing with their capabilities of high-throughput sample processing and reduced
sample depletion. However, microscale fluid mixing is inherently hampered due
to the characteristics of a low Reynolds number flows in diminutive channels.
Microscale fluid mixing mainly depends on molecular diffusion and thus requires
long processing time. In order to address the conundrum, a variety of active
microfluidic approaches for swift and efficient mixing have been developed
using electro-kinetic flow, laser-induced flow, magnetic stirring, and acoustic
streaming flow (ASF). Among these techniques with external force fields,
acoustofluidic fluid mixing has been acclaimed due to its on-demand,
controllable, non-invasive and biocompatible nature. In this study, we
performed numerical simulations of acoustic streaming flows, induced by with a
highly localized surface acoustic waves (SAWs), in a microscale fluidic channel
based on an acoustic wave attenuation model
