  Acoustic streaming can be generated around sharp structures, even when the
acoustic wavelength is much larger than the vessel size. This sharp-edge
streaming can be relatively intense, \textcolor{blue}{owing to the strongly
focused inertial effect experienced by the acoustic flow near the tip.} We
conducted experiments with Particle Image Velocimetry to quantify this
streaming flow through the influence of liquid viscosity $\nu$, from 1 mm$^2$/s
to 30 mm$^2$/s, and acoustic frequency $f$ from 500 Hz to 3500 Hz. Both
quantities supposedly influence the thickness of the viscous boundary layer
$\delta = \left(\frac{\nu}{\pi f}\right)^{1/2}$. For all situations, the
streaming flow appears as a main central jet from the tip, generating two
lateral vortices beside the tip and outside the boundary layer. As a
characteristic streaming velocity, the maximal velocity is located at a
distance of $\delta$ from the tip, and it increases as the square of the
acoustic velocity. We then provide empirical scaling laws to quantify the
influence of $\nu$ and $f$ on the streaming velocity. Globally, the streaming
velocity is dramatically weakened by a higher viscosity, whereas the flow
pattern and the disturbance distance remain similar regardless of viscosity.
Besides viscosity, the frequency also strongly influences the maximal streaming
velocity.
