Advances in droplet aerobreakup

Sharma, Shubham; Chandra, Navin Kumar; Basu, Saptarshi; Kumar, Aloke

doi:10.1140/epjs/s11734-022-00653-z

Cited by 18 publications

(22 citation statements)

References 74 publications

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“…2015; Sharma et al. 2022). Breakup mode is among the several factors responsible for determining the final size distribution of atomized droplets (Chen et al.…”

Section: Introductionmentioning

confidence: 99%

“…2009; Guildenbecher, López-Rivera & Sojka 2011; Sharma et al. 2022). In several studies, polymeric solutions have been employed as the model fluid to investigate the aerobreakup of non-Newtonian liquids (Wilcox et al.…”

Section: Introductionmentioning

confidence: 99%

“…Significant research has already been done to study the aerobreakup of Newtonian droplets, which is well reviewed in the literature (Pilch & Erdman 1987; Gelfand 1996; Guildenbecher, López-Rivera & Sojka 2009; Jackiw & Ashgriz 2021; Sharma et al. 2021 c , 2022). It is well established that the two most important dimensionless groups in the study of Newtonian droplet aerobreakup are Weber number () and Ohnesorge number (), defined as where and are the gas- and liquid-phase densities, is the free-stream velocity of the gas, is the surface tension at the liquid–gas interface, is the initial diameter of the droplet and is the dynamic viscosity of the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

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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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“…2015; Sharma et al. 2022). Breakup mode is among the several factors responsible for determining the final size distribution of atomized droplets (Chen et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shock-induced aerobreakup of a polymeric droplet

et al. 2023

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“…2022; Sharma et al. 2022). The intricate synergy between the aerodynamic forces and surface tension-based instabilities leads to varying droplet morphologies which are sensitive to the flow conditions and fluid properties.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the laminar transition from deformation to breakup observed in shear flow, a complex fragmentation phenomenon is noticed when a droplet encounters a gas stream (Guildenbecher, López-Rivera & Sojka 2009;Kamiya et al 2022;Sharma et al 2022). The intricate synergy between the aerodynamic forces and surface tension-based instabilities leads to varying droplet morphologies which are sensitive to the flow conditions and fluid properties.…”

Section: Introductionmentioning

confidence: 99%

Microemulsification from single laser-induced cavitation bubbles

et al. 2022

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We study the interaction between a laser-induced cavitation bubble and a submillimetre-sized water droplet submerged in silicone oil. High-speed imaging reveals the pathways through which droplet fragmentation occurs and three distinct regimes of bubble–droplet interaction are identified: deformation, external emulsification and internal emulsification. We have observed that during the bubble collapse, the droplet elongates towards the bubble, which acts as a flow sink pulling on the droplet. For silicone oils with higher viscosity, the droplet jets into the cavitation bubble and forms a satellite water droplet in the continuous oil phase. In contrast, for lower-viscosity oils, the droplet encapsulates the collapsing bubble as it jets inside and undergoes multiple cycles of expansion and collapse. These internal bubble collapses create tiny oil droplets inside the parent water droplet. The kinematic viscosity of the silicone oil, maximum bubble diameter and centre-to-centre distance between the bubble and the droplet are varied. The regimes are separated in a parameter space set up by the non-dimensional distance and a cavitation Reynolds number.

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Aerodynamic breakup of emulsion droplets in airflow

Xu,

Liu,

Zhang

et al. 2024

Droplet

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Aerodynamic breakup refers to the process where large droplets are fragmented into small droplets by the aerodynamic force in airflow, which plays a vital role in fluid atomization and spray applications. Previous research has primarily concentrated on the aerodynamic breakup of single‐component droplets, but investigations into the breakup of emulsion droplets are limited. This study experimentally investigated the aerodynamic breakup of water‐in‐oil emulsions in airflow, utilizing high‐speed photography to observe the breakup process and digital in‐line holography to measure fragment sizes. Comparative analyses between emulsion droplets and single‐component droplets are conducted to examine the breakup morphology, breakup regime, deformation characteristics, and fragment size distributions. The emulsion droplets exhibit higher apparent viscosity and shorter stretching lengths of the bag film and peripheral rim due to the presence of a dispersed phase. The breakup regime transitions of emulsions are modeled by integrating the viscosity model of emulsions and the transition model of the pure fluid. The fragment sizes of emulsion droplets are larger due to the shorter lengths of the bag film and peripheral rim.

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Advances in droplet aerobreakup

Cited by 18 publications

References 74 publications

Shock-induced aerobreakup of a polymeric droplet

Shock-induced aerobreakup of a polymeric droplet

Microemulsification from single laser-induced cavitation bubbles

Aerodynamic breakup of emulsion droplets in airflow

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