The role of cavitation in submicron aerosol dispersion

Olga Kudryashova,Boris Vorozhtsov,Evgeny Muravlev,Igor Akhmadeev,A Vorozhtsov

doi:10.1051/matecconf/201824300003

Olga Kudryashova, Boris Vorozhtsov + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/201824300003

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Abstract

Here we discuss the problem of atomizing submicron aerosols by special design atomizers enabling the cavitation regime. The formation of submicron aerosol was studied using an impulse atomizer model powered by a high-energy material and an atomizer model with a special spray nozzle generating countercurrent flows. For these atomizers, the role played by cavitation in producing submicron liquid aerosols is demonstrated herein. A mathematical model is also suggested to describe the aerosol cloud genesis. The cavitation development critical pressure, outflow velocity, and the resulting droplet sizes were evaluated. The aerosol particle size and concentration were experimentally measured by optical methods. The measured disperse parameters of aerosols during the origination and propagation of the aerosol cloud resulted from the cavitation-assisted atomization of liquids are reported: the intrinsic particle diameter of water aerosol is 10…30 μm depending on the features of the atomizer designs and their operating regimes.

Highlights

There are real-world problems in generating an aerosol cloud that require droplets of smallest size and highest specific surface
There is a possibility to produce fine aerosol even at moderate outflow velocities and energy inputs for atomization demonstrated by the example of an impulse aerosol generator powered by a high-energy material (HEM) [6]
It has theoretically been shown that acoustic vibrations in the atomized medium promote the cavitation development

Summary

Introduction

There are real-world problems in generating an aerosol cloud that require droplets of smallest size and highest specific surface. Generation of fine aerosols is a stage of nanoparticles synthesis [3,4]. The aerodynamic atomization has a theoretical limit on the size of the resulting droplets as a function of the jet outflow rate [5]. There is a possibility to produce fine aerosol even at moderate outflow velocities and energy inputs for atomization demonstrated by the example of an impulse aerosol generator powered by a high-energy material (HEM) [6]. It was shown that droplet’ size could be reduced by the cavitation phenomenon in the impulse atomization as compared to aerodynamic atomization techniques

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