Emulsions: Principles and preparation - Making emulsions using flow fields - Laminar flow - Plain shear flow and extensional flow

3 important questions on Emulsions: Principles and preparation - Making emulsions using flow fields - Laminar flow - Plain shear flow and extensional flow

What is the Weber number?

The ratio of the externally applied stress and the internal, coherent tension.
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Which 2 types of laminar flow are there and what is the difference?

  • Simple shear flow --> e.g. through a tube
  • Extensional flow --> through a small opening --> more effective in disrupting a droplet
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What is the critical Weber number?

The value of the Weber number should be as high as this critical number, to achieve break-up of the droplet.
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