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Related Experiment Videos

Encapsulated drop breakup in shear flow.

K A Smith1, J M Ottino, M Olvera de la Cruz

  • 1Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, USA.

Physical Review Letters
|December 17, 2004
PubMed
Summary

We studied how encapsulated drops deform and break apart in shear flow. Novel drop shapes and movements arise from the interaction between the core and shell fluid interfaces.

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Area of Science:

  • Fluid dynamics
  • Rheology
  • Microfluidics

Background:

  • Encapsulated drops, with distinct core and shell fluids, exhibit complex behaviors under flow.
  • Understanding their deformation and breakup is crucial for applications in materials science and microfluidics.

Purpose of the Study:

  • To investigate the deformation and breakup dynamics of Newtonian encapsulated drops in shear flow.
  • To characterize the resulting morphologies and kinematics under varying conditions.

Main Methods:

  • Numerical simulation using a level set method to track interface evolution.
  • Analysis of drop behavior after initial stretching in constant shear followed by relaxation.

Main Results:

  • Observed a range of complex drop morphologies due to core-shell interface interactions.
  • Identified novel kinematic behaviors arising from these interactions.
  • Developed a phase diagram mapping morphologies against capillary numbers and interfacial tensions.

Conclusions:

  • The interplay between core and shell interfaces significantly influences encapsulated drop deformation and breakup.
  • The study provides a framework for predicting drop morphologies in shear flow based on fluid properties and flow conditions.

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