Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
VELOCITY MEASUREMENT OF LIQUID/GEL DROPLETS USING SHADOW IMAGES
Submission Author:
Gabriel Silva Dias , SP
Co-Authors:
Gabriel Silva Dias, Danilo Almeida Machado, FERNANDO DE SOUZA COSTA
Presenter: Gabriel Silva Dias
doi://10.26678/ABCM.COBEM2021.COB2021-0439
Abstract
IIn this experimental work two identical impinging jet injectors were used to produce a fluid sheet. Two configurations were adopted, like and unlike impingement to form a liquid water/liquid water and a liquid water/gelled ethanol sheet, respectively. In order to compare those different configurations, the same jet momentum was adopted. The formed sheet undergoes fragmentation process. When the jet velocities are relatively low, droplets detach mainly from the rim’s sheet and stays in the same plane, resulting essentially in a two-dimensional movement, differently from a completely developed spray, achieved with high jet velocities. An instrumented workbench with a high-speed camera and lenses were used to obtain shadow images of the atomization field. An opensource Particle Image Velocimetry (PIV) software was used to analyze batches of shadow images. The droplet and ligaments velocities presented a parabolic profile, in agreement with literature, demonstrating that shadow images together with open-source PIV is suitable for specific multiphase flows.
Keywords
PIV, Shadowgraph, Atomization, Impinging-Jet Injectors, Droplet velocity
