Rheocoalescence: Relaxation time through coalescence of droplets

Varma, Sarath Chandra; Singh, Rajput, Abhineet; Kumar, Aloke

doi:10.48550/arxiv.2201.12555

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“…Flow curve for different solutions is shown in Figure 2c, and Figure 2d shows the storage modulus (G ) and the loss modulus (G ) obtained from frequency sweep of small amplitude oscillatory shear (SAOS) test at a strain amplitude of 10%. Solutions with concentration 1% and 0.4% w/w falls in the entangled regime of the polymeric solution 30 and shows significantly high zero-shear viscosity compared to the remaining solutions. These higher concentration solutions also exhibit significant amount of elasticity which can be inferred from their comparable magnitude of G and G .…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Shock induced aerobreakup of a polymeric droplet

Chandra¹,

Sharma²,

Basu³

et al. 2022

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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.

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Section: Sample Preparation and Characterizationmentioning

confidence: 99%