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High-Speed Diagnostics For The Study Of Droplet Breakup

A. R. Dworzanczyk, N. J. Parziale

Dept. of Mechanical Engineering, Stevens Institute of Technology, United States

In this work, we demonstrate the use of planar laser-induced fluorescence (PLIF) and back-lit shadowgraph imaging at 1.75~MHz to study the breakup of a 1-mm-diameter liquid drop in the presence of an air jet intersecting the drop's velocity vector. For the PLIF, a 447-nm laser diode is focused to form a high-intensity sheet to excite the DCM dye suspended in the ethanol droplet. For the back-lit shadowgraphy, a 685-nm fiber-coupled laser diode is used to generate a collimated beam of light to illuminate a stream of droplets as they are disrupted by a jet of air. All the complications associated with performing experiments in a ballistic range (luminosity filter, single-event triggering, standoff distance, etc.) were taken into account in this laboratory setup.

20th Edition
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