ID 135

Size-Velocity PDFs for Impinging Jet Atomizer-Produced Sprays

 

Abstract:

Aircraft engine performance, pharmaceutical tablet efficacy, and agro-chemical overspray will all be optimized by understanding how drops break up. In the first case, large drop fragments lead to lowered fuel economy and higher pollutant emissions rates. In the second case, drug uptake and patient comfort will both be improved. In the last case, agro-chemical usage and the resulting spread into surrounding residential and environmental zones will be reduced. The experimental apparatus included a pair of impinging jets and a digital inline holography (DIH) system. The jets had a nearly uniform velocity profile. Jet We was controlled by varying the velocity. DIH was used to investigate drop breakup as a function of We. The apparatus followed that of Guildenbecher et al. (2016) and consisted of a CW laser, spatial filter, and collimator. A Photron SA-Z camera was used to collect the holograms, which contained 3D fragment sizes and positions during breakup. Fragment velocity was determined from positions in adjacent image pairs for each reconstructed hologram using HoloSAND (Guildenbecher, 2015). The DIH data were used to create pdf(d,V).