On the interaction of water droplet with a shock wave: Experiment and numerical simulation

Poplavski, S. V.; Минаков, А. В.; Shebeleva, A. A.; Boyko, Viktor M.

doi:10.1016/j.ijmultiphaseflow.2020.103273

Cited by 42 publications

(21 citation statements)

References 26 publications

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“…The disintegration of a millimetre-sized primary droplet into micron-sized daughter droplets within a time scale of few microseconds requires high spatiotemporal resolution. Although numerical advancement in this direction can be achieved by increasing the computational cost (Poplavski et al 2020), and has also been attempted much efficiently in recent times (Jalaal & Mehravaran 2014;Meng & Colonius 2015;Guan et al 2018;Liu et al 2018;Dorschner et al 2020), the experimental works pertaining to high spatiotemporal resolution are still lacking. For example, a high-speed camera's field of view must be compromised to increase the temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Shock induced aerobreakup of a droplet

et al. 2021

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The multiscale dynamics of a shock–droplet interaction is crucial in understanding the atomisation of droplets due to external airflow. The interaction phenomena are classified into wave dynamics (stage I) and droplet breakup dynamics (stage II). Stage I involves the formation of different wave structures after an incident shock impacts the droplet surface. These waves momentarily change the droplet's ambient conditions, while in later times they are mainly influenced by shock-induced airflow. Stage II involves induced airflow interaction with the droplet that leads to its deformation and breakup. Primarily, two modes of droplet breakup, i.e. shear-induced entrainment and Rayleigh–Taylor piercing (RTP) (based on the modes of surface instabilities) were observed for the studied range of Weber numbers $(We\sim 30\text{--}15\,000)$ . A criterion for the transition between two breakup modes is obtained, which successfully explains the observation of RTP mode of droplet breakup at high Weber numbers $(We\sim 800)$ . For $We > 1000$ , the breakup dynamics is governed by the shear-induced surface waves. After formation, the Kelvin–Helmholtz waves travel on the droplet surface and merge to form a liquid sheet near the droplet equator. Henceforth, the liquid sheet undergoes breakup processes via nucleation of several holes. The breakup process is recurrent until the complete droplet disintegrates or external drag acting on the droplet is insufficient for further disintegration. At lower Weber numbers, the droplet undergoes complete deformation like a flattened disk, and a multibag mode of breakup based on RTP is observed.

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Section: Introductionmentioning

confidence: 99%

Shock induced aerobreakup of a droplet

et al. 2021

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“…For the transient tracking of the liquid-gas interface during the interaction process, the VOF method was used, which allows the approximation of the boundary between the two different phases on a fixed numerical mesh. The VOF technique was shown to be more efficient and flexible than other methods when treating the complex interface between two immiscible fluids [21], and has been very often employed to study the SW/droplet interaction [6,12].…”

Section: Vof Methodsmentioning

confidence: 99%

“…Several studies have been conducted to investigate this process for correctly interpreting the underlying physical mechanisms. In particular, a number of experimental studies employing shock tube devices have been carried out, wherein a traveling planar SW is reproduced, with uniform gaseous flow conditions being established [5,6]. In these experiments, sophisticated visualization techniques are employed, where the shock front passes over liquid droplets causing their deformation, drift and breakup, due to sudden acceleration.…”

Section: Introductionmentioning

confidence: 99%

“…The governing equations consist of two continuity equations for the two different phases, the mixture momentum and energy equations, and the volume fraction advection equation [16,18]. As far as turbulence modeling is concerned, either under-resolved direct numerical simulation (DNS) or large eddy simulation (LES) approaches are usually followed [6,14].…”

Section: Introductionmentioning

confidence: 99%

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Computational Evaluation of Shock Wave Interaction with a Liquid Droplet

2022

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This article represents the natural continuation of the work by Rossano and De Stefano (2021), dealing with the computational fluid dynamics analysis of a shock wave interaction with a liquid droplet. Differently from our previous work, where a two-dimensional approach was followed, fully three-dimensional computations are performed to predict the aerodynamic breakup of a spherical water body due to the impact of a traveling shock wave. The present engineering analysis focuses on capturing the early stages of the breakup process under the shear-induced entrainment regime. The unsteady Reynolds-averaged Navier–Stokes approach is used to simulate the mean turbulent flow field in a virtual shock tube device with circular cross section. The compressible-flow-governing equations are numerically solved by means of a finite volume method, where the volume of fluid technique is employed to track the air–water interface. The proposed computational modeling approach for industrial gas dynamics applications is verified by making a comparison with reference numerical data and experimental findings, achieving acceptably accurate predictions of deformation and drift of the water body without being computationally cumbersome.

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“…It is also known that large water droplets can be broken into smaller droplets when a shock wave passes. 8 These smaller droplets may persist in the air for longer times than millimeter-sized airborne droplets containing SARS-CoV-2 that may be exhaled by an infected individual when coughing or sneezing. The possible reduction in droplet size may result in an increase in the number of infected droplets being propagated long distances by subsequent shock fronts, adding to the importance of determining whether the shock fronts from brass instruments can, indeed, contribute to spreading of COVID-19.…”

Section: Introductionmentioning

confidence: 99%

Do “brassy” sounding musical instruments need increased safe distancing requirements to minimize the spread of COVID-19?

Moore

Cannaday

2020

The Journal of the Acoustical Society of America

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Brass wind instruments with long sections of cylindrical pipe, such as trumpets and trombones, sound “brassy” when played at a fortissimo level due to the generation of a shock front in the instrument. It has been suggested that these shock fronts may increase the spread of COVID-19 by propelling respiratory particles containing the SARS-CoV-2 virus several meters due to particle entrainment in the low pressure area behind the shocks. To determine the likelihood of this occurring, fluorescent particles, ranging in size from 10–50 μm, were dropped into the shock regions produced by a trombone, a trumpet, and a shock tube. Preliminary results indicate that propagation of small airborne particles by the shock fronts radiating from brass wind instruments is unlikely.

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On the interaction of water droplet with a shock wave: Experiment and numerical simulation

Cited by 42 publications

References 26 publications

Shock induced aerobreakup of a droplet

Shock induced aerobreakup of a droplet

Computational Evaluation of Shock Wave Interaction with a Liquid Droplet

Do “brassy” sounding musical instruments need increased safe distancing requirements to minimize the spread of COVID-19?

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