Coupled x-ray high-speed imaging and pressure measurements in a cavitating backward facing step flow

The two-phase flow generated behind a cavitating backward-facing step is studied using the combination of three experimental techniques: wall-pressure measurements, global high-speed imaging with visible light, and high spatial temporal resolution x-ray imaging. Three zones are identified based on topology vapor fraction maps, that correspond to vaporization, transport, condensation. Simultaneous pressure void measurements reveal extreme events associated change from shear layer mode wake mode, signature heavily affected by presence phase.