Effects of elasticity number and time constant ratio on breakup and droplet formation of viscoelastic planar liquid sheet co-flowing with gases of equal velocities

Dasgupta, Debayan; Sharma, Saurabh; Nath, Sujit; Bhanja, Dipankar

doi:10.1017/jfm.2021.412

Cited by 5 publications

(3 citation statements)

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“…2015; Dasgupta et al. 2021), whereas others reported it as a stabilizing agent (Goren & Gottlieb 1982; Bousfield et al. 1986; Ruo et al.…”

Section: Resultsmentioning

confidence: 99%

“…There are theoretical studies related to the breakup of viscoelastic sheets and ligaments, but the results are ambiguous in the sense that some literature reported elasticity as a destabilizing agent (Liu, Brenn & Durst 1998;Wang et al 2015;Dasgupta et al 2021), whereas others reported it as a stabilizing agent (Goren & Gottlieb 1982;Bousfield et al 1986;Ruo et al 2011;Yang, Tong & Fu 2013;Xie et al 2016). The resolution for this discrepancy comes in terms of unrelaxed tension (Xie et al 2016) in the liquid phase.…”

Section: Stage Ii: Rt Instability Asmentioning

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; Dasgupta et al. 2021), whereas others reported it as a stabilizing agent (Goren & Gottlieb 1982; Bousfield et al. 1986; Ruo et al.…”

Section: Resultsmentioning

confidence: 99%

Section: Stage Ii: Rt Instability Asmentioning

confidence: 99%

Shock-induced aerobreakup of a polymeric droplet

et al. 2023

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“…Another interesting observation is the formation of a bead on a string structure (BOAS), reported widely in extensional flows of dilute polymeric solutions model these complex phenomena, especially the fragment size at high We. There are theoretical studies related to the breakup of viscoelastic sheets and ligaments, but the results are ambiguous in a sense that, some literature reported elasticity as a destabilizing agent [42][43][44] , whereas others reported it as a stabilizing agent [45][46][47][48][49] . The resolution for this discrepancy comes in terms of unrelaxed tension 49 in the liquid phase.…”

Section: Stage-ii: Rt Instabilitymentioning

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