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arXiv · 2205.15597

Shock induced aerobreakup of a polymeric droplet

Navin Kumar Chandra·Shubham Sharma·Saptarshi Basu·Aloke Kumar
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Abstract

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 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 ($\sim 10^2-10^4$) and Elasticity number ($\sim 10^{-4}-10^2$) 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.

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Navin Kumar Chandra, Shubham Sharma, Saptarshi Basu, Aloke Kumar. 2022-05-31. Shock induced aerobreakup of a polymeric droplet. https://arxiv.org/abs/2205.15597

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