On the dynamics of vortex–droplet co-axial interaction: insights into droplet and vortex dynamics

Sharma, Shubham; Singh, Awanish Pratap; Basu, Saptarshi

doi:10.1017/jfm.2021.363

Cited by 14 publications

(6 citation statements)

References 83 publications

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“…At early times of droplet–airflow interaction, the air stream almost achieves stagnation pressure at the windward and the leeward side of the droplet. Under the action of this pressure, the droplet deforms to change its shape from a sphere to a cupcake geometry, often approximated to an oblate spheroid for modelling purposes (Sor & García-Magariño 2015; Sharma, Singh & Basu 2021 b ). Deformation is quantified in terms of aspect ratio , where is the maximum cross-stream diameter of the deformed droplet.…”

Section: Resultsmentioning

confidence: 99%

Shock-induced aerobreakup of a polymeric droplet

et al. 2023

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Droplet atomization through aerobreakup is omnipresent in various natural and industrial processes. Atomization of Newtonian droplets is a well-studied area; however, non-Newtonian droplets have received less attention despite their being frequently encountered. By subjecting polymeric droplets of different concentrations to the induced airflow behind a moving shock wave, we explore the role of elasticity in modulating the aerobreakup of viscoelastic droplets. Three distinct modes of aerobreakup are identified for a wide range of Weber number $({\sim }10^2\unicode{x2013}10^4)$ and elasticity number $({\sim }10^{-4}\unicode{x2013}10^2)$ variation: these modes are vibrational, shear-induced entrainment and catastrophic breakup modes. Each mode is described as a three-stage process. Stage I is droplet deformation, stage II is the appearance and growth of hydrodynamic instabilities and stage III is the evolution of liquid mass morphology. It is observed that elasticity plays an insignificant role in the first two stages but a dominant role in the final stage. The results are described with the support of adequate mathematical analysis.

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Section: Resultsmentioning

confidence: 99%

Shock-induced aerobreakup of a polymeric droplet

et al. 2023

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“…The mean flow in the experimental set-up is . The details of these experiments are provided in Sharma, Singh & Basu (2021) and Sharma et al. (2022).…”

Section: Resultsmentioning

confidence: 99%

“…The mean flow in the experimental set-up is 0.3 m s −1 . The details of these experiments are provided in Sharma, Singh & Basu (2021) and Sharma et al (2022). Experimentally, we can only measure the droplet diameter as a function of time, which has been compared with the model for two cases, i.e.…”

Section: Model Validationmentioning

confidence: 99%

Effects of oscillating gas-phase flow on an evaporating multicomponent droplet

Majee

Saha²,

Basu³

2023

J. Fluid Mech.

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The dynamics of an evaporating droplet in an unsteady flow is of practical interest in many industrial applications and natural processes. To investigate the transport and evaporation dynamics of such droplets, we present a numerical study of an isolated droplet in an oscillating gas-phase flow. The study uses a one-way coupled two-phase flow model to assess the effect of the amplitude and the frequency of a sinusoidal external flow field on the lifetime of a multicomponent droplet containing a non-volatile solute dissolved in a volatile solvent. The results show that the evaporation process becomes faster with an increase in the amplitude or the frequency of the gas-phase oscillation. The liquid-phase transport inside the droplet also is influenced by the unsteadiness of the external gas-phase flow. A scaling analysis based on the response of the droplet under the oscillating drag force is subsequently carried out to unify the observed evaporation dynamics in the simulations under various conditions. The analysis quantifies the enhancement in the droplet velocity and Reynolds number as a function of the gas-phase oscillation parameters and predicts the effects on the evaporation rate.

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“…At early times of droplet-airflow interaction, the air-stream almost achieves stagnation pressure at the windward and the leeward side of the droplet. Under action of this pressure, droplet deforms to change its shape from sphere to a cupcake geometry, often approximated to an oblate spheroid for modelling purpose 31,32 . Deformation is quantified in terms of aspect ratio D/D 0 where D is the maximum cross stream diameter of the deformed droplet.…”

Section: Stage-i: Droplet Deformationmentioning

confidence: 99%

Shock induced aerobreakup of a polymeric droplet

Chandra¹,

Sharma²,

Basu³

et al. 2022

Preprint

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Droplet atomization through aerobreakup is omnipresent in various natural and industrial processes. Atomization of Newtonian droplets is a well-studied area; however, non-Newtonian droplets have received less attention despite their frequent encounters. By subjecting polymeric droplets of different concentration to the induced airflow behind a moving shock wave, we explore the role of elasticity in modulating the aerobreakup of viscoelastic droplets. Three distinct modes of aerobreakup are identified for a wide range of Weber number (∼ 10 2 − 10 4 ) and Elasticity number (∼ 10 −4 − 10 2 ) variation; these modes are-vibrational, shear-induced entrainment and catastrophic breakup mode. Each mode is described as a three stage process. Stage-I is the droplet deformation, stage-II is the appearance and growth of hydrodynamic instabilities, and stage-III is the evolution of liquid mass morphology. It is observed that elasticity plays an insignificant role in the first two stages, but a dominant role in the final stage. The results are described with the support of adequate mathematical analysis.

show abstract

On the dynamics of vortex–droplet co-axial interaction: insights into droplet and vortex dynamics

Abstract: Abstract

Cited by 14 publications

References 83 publications

Shock-induced aerobreakup of a polymeric droplet

Shock-induced aerobreakup of a polymeric droplet

Effects of oscillating gas-phase flow on an evaporating multicomponent droplet

Shock induced aerobreakup of a polymeric droplet

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