ID 132

Size-Velocity pdfs for Drop Fragments Formed via Sheet-Thinning Breakup

 

Abstract:

The transition into sheet-thinning breakup was experimentally investigated using digital in-line holography to measure volume and velocity probability distribution functions (pdf). Fragment sizes and velocities were extracted through a MATLAB script used to reconstruct the holograms and track the size and position of the particles through the breakup process. Results are reported in terms of Weber number, ranging from 50<We<100, and Ohnesorge number, approximately equal to 0.007. It was found that the transition from multi-mode to sheet-thinning breakup could be observed through trends in both volume and velocity pdfs. At low Weber numbers, the volume pdfs showed a second peak at higher diameters. This peak began to flatten as Weber number increase. Velocity pdfs showed a large peak and narrow distribution at lower Weber numbers, and the opposite trend as Weber number increased above We=80. The results will be useful for modeling sprays in gas turbine engines, pharmaceutical tablet coaters, and agro-chemical overspray.