Cavitation behind a circular cylinder is studied with the aid of highly time resolved images at a constant
Reynolds number of 64000. Apart from recording overall cavitation activity behind the cylinder, the study also
delves into the dynamics of individual cavities. The length of cavity scales with cavitation number and this scaling
is similar to the existing results obtained in flow regimes different from that presented here. Dynamics of individual
cavities show distinct phases of cavity formation, growth and collapse. At lower cavitation numbers cavity collapse
was followed by a rebounce. Variation of area normalized by the length of cavity shows self similarity in the growth
phase of cavities for different cavitation numbers. Thus cavity length is the suitable length scale for dynamics of
cavities, at least for the growth phase. The cavity lifetime scales inversely with the square of cavitation number.
Dynamics of individual small cavity captured at higher frame rates was found to be similar to that of an isolated
bubble. In this case, a rapid collapse follow a more gradual expansion phase, unlike that shown by larger cavities.