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Updated: Mar 12, 2026
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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
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Morphology of compound viscoelastic drops in extensional flows
1Department of Mechanical Engineering, Indian Institute of Technology, Gandhinagar, Gujarat-382355, India. uddipta.ghosh@iitgn.ac.in.
Soft Matter
|March 11, 2026
Summary
Viscoelastic compound droplets deform less in extensional flows due to elastic stresses. The Giesekus model explains how shear-thinning and finite extensibility influence droplet shape, impacting drug delivery and microfluidic applications.
Area of Science:
- Fluid dynamics
- Rheology
- Polymer physics
Background:
- Compound droplets are crucial for drug delivery and microfluidics.
- Understanding their behavior in complex flows is challenging due to non-linear fluid properties.
Purpose of the Study:
- Analyze the flow and deformation of viscoelastic compound droplets in uniaxial extensional flows.
- Investigate the influence of the Giesekus constitutive model on droplet morphology.
Main Methods:
- Derived asymptotic solutions for small deformations and weak viscoelasticity.
- Validated results using full numerical simulations with the ternary phase field method.
Main Results:
- Elongational elastic stresses reduce shell and core deformations, aided by Giesekus model's shear-thinning and finite extensibility.
- Droplet shape transitions (prolate to oblate) depend on outer phase viscoelasticity and core size.
- Core viscoelasticity impacts core evolution but has minor effects on shell deformation.
Conclusions:
- The Giesekus model accurately describes viscoelastic compound droplet behavior in extensional flows.
- Elastic stresses play a key role in controlling droplet morphology.
- Findings advance microfluidic and targeted delivery applications.
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