Publications

KHz rate digital in-line holography applied to quantify secondary droplets from the aerodynamic breakup of a liquid column in a shock-tube

Guildenbecher, Daniel R.; Wagner, Justin W.; Olles, Joseph D.; Chen, Yi; DeMauro, Edward P.; Farias, Paul A.; Grasser, Thomas W.; Sojka, Paul E.

The breakup of liquids due to aerodynamic forces has been widely studied. However, the literature contains limited quantified data on secondary droplet sizes, particularly as a function of time. Here, a column of liquid water is subjected to a step change in relative gas velocity using a shock tube. A unique digital in-line holography (DIH) configuration is proposed which quantifies the secondary droplets sizes, three-dimensional position, and three-component velocities at 100 kHz. Results quantify the detailed evolution of the characteristic mean diameters and droplet size-velocity correlations as a function of distance downstream from the initial location of the water column. Accuracy of the measurements is confirmed through mass balance. These data give unprecedented detail on the breakup process which will be useful for improved model development and validation.