Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M08: Multiphase Flows: Turbulence II
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B213
Chair: Bamdad Lessani, South Dakota School of Mines & Technology
Abstract ID: BAPS.2018.DFD.M08.7
Abstract: M08.00007 : Control and ultrasonic actuation of a coaxial two-fluid atomizer.*
9:18 AM–9:31 AM
Abstract 
Presenter:
Peter Dearborn Huck
(Mechanical Engineering Department, University of Washington)
Authors:
Peter Dearborn Huck
(Mechanical Engineering Department, University of Washington)
Nathanael Machicoane
(Mechanical Engineering Department, University of Washington)
Rodrigo Osuna Orozco
(Mechanical Engineering Department, University of Washington)
Adam Maxwell
(Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, Univ Washington, Department of Urology, University of Washington School of Medicine)
Alberto Aliseda
(Mechanical Engineering Department, University of Washington)
We experimentally investigate the atomization of a laminar fluid stream by a coaxial turbulent air jet with gas Reynolds numbers ranging from 104-105. Multi-physics control strategies are employed to drive droplet spatio-temporal and size distributions are towards a desired objective for feedback control of sprays. We present results from ultrasonic spray manipulation in which six transducers, emitting tone bursts at 2.1 MHz, are aligned axially and attached to the back of the liquid/gas nozzle. The nozzle shape acts as an acoustic coupler and amplifier: the displacements applied at the wide back end are amplified as they travel towards the nozzle throat where the liquid jet atomization is perturbed at ultrasonic frequencies. High-speed shadowgraphy is used to investigate the effect of acoustic forcing on the primary and secondary instabilities in the spray's near-field. Phase Doppler Particle Analysis (PDPA) is employed to measure the droplet size, location, and velocity distributions as the spray structure develops.
*This work was sponsored by the Office of Naval Research (ONR), as part of the Multidisciplinary University Research Initiatives (MURI) Program, under grant number N00014-16-1-2617.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M08.7
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