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Shock-induced aerobreakup of a polymeric droplet

Published online by Cambridge University Press:  08 June 2023

Navin Kumar Chandra Open the ORCID record for Navin Kumar Chandra [Opens in a new window] ,
Shubham Sharma Open the ORCID record for Shubham Sharma [Opens in a new window] ,
Saptarshi Basu Open the ORCID record for Saptarshi Basu [Opens in a new window]  and
Aloke Kumar Open the ORCID record for Aloke Kumar [Opens in a new window]
Navin Kumar Chandra
Affiliation:
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India
Shubham Sharma
Affiliation:
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India
Saptarshi Basu*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore 560012, India
Aloke Kumar*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India
*
†Email addresses for correspondence: sbasu@iisc.ac.in, alokekumar@iisc.ac.in
†Email addresses for correspondence: sbasu@iisc.ac.in, alokekumar@iisc.ac.in
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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 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.

JFM classification

Drops and Bubbles: Drops and Bubbles
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 965 , 25 June 2023 , A1
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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Kumar Chandra et al. Supplementary Movie 1

Vibrational breakup mode.

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Video 30.2 MB

Kumar Chandra et al. Supplementary Movie 2

SIE breakup mode.

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Video 15.4 MB

Kumar Chandra et al. Supplementary Movie 3

Catastrophic breakup mode.

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Video 7.4 MB

Kumar Chandra et al. Supplementary Movie 4

The three stages of droplet breakup.

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Video 17.8 MB