Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Generated time-dependent streamwise peak flow velocity at the rotational frequencies of 30 (a), 40 (b), and 50 Hz (c). Particle images were recorded at a frame rate of 200 Hz (first column). In the second column, the frame rate was identical to the corresponding selected rotational frequency for quantification of the induced net flow.
