Control and ultrasonic actuation of a coaxial two-fluid atomizer.

ORAL

Abstract

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.

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Presenters

  • Peter Dearborn Huck

    Univ of Washington, Mechanical Engineering Department, University of Washington

Authors

  • Peter Dearborn Huck

    Univ of Washington, Mechanical Engineering Department, University of Washington

  • Nathanael Machicoane

    Univ of Washington, Mechanical Engineering Department, University of Washington, Laboratoire FAST, CNRS, Université Paris-Sud, Université Paris-Saclay, University of Washington, Department of Mechanical Engineering

  • Rodrigo Osuna Orozco

    Univ of Washington, Mechanical Engineering Department, University of Washington, 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 Osuna Aliseda

    University of Washington, Department of Mechanical Engineering, University of Washington, Department of Mechanical Engineering, University of Washington, Seattle, WA, USA, Department of Neurological Surgery, University of Washington, Seattle, WA, USA, Mechanical Engineering Department, University of Washington, Department of Mechanical Engineering, University of Washington, Seattle, WA, USA, Mechanical Engineering, University of Washington, Seattle, USA