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Related Experiment Videos

Bubble shapes and orientations in low Re simple shear flow.

A C Rust1, Michael Manga

  • 1Department of Geological Sciences, 1272 University of Oregon, Eugene, Oregon 97403, USA.

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
Summary

This study measured air bubble deformation in viscous fluids under shear. Results confirm theoretical models for bubble shape and orientation across various deformation levels, validating their applicability within specific capillary number ranges.

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Area of Science:

  • Fluid Dynamics
  • Rheology
  • Microfluidics

Background:

  • Experimental studies on bubble deformation in viscous fluids have historically focused on limited deformation ranges.
  • Qualitative assessments of bubble orientation have been prevalent, particularly for small deformations.

Purpose of the Study:

  • To experimentally measure the shape and orientation of air bubbles in a Newtonian fluid undergoing simple shear.
  • To validate existing theoretical relationships for bubble deformation and orientation across a wide range of capillary numbers.
  • To investigate bubble relaxation dynamics after shear stress removal.

Main Methods:

  • Utilized a modified parallel band apparatus, inspired by G. I. Taylor's design.
  • Conducted experiments spanning both small and large deformation regimes.

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  • Measured bubble shape and orientation under varying shear conditions and capillary numbers.

    • Main Results:

    • Confirmed Taylor's small deformation theory for capillary numbers less than 0.5.
    • Validated Hinch and Acrivos's large deformation theories for bubble shape (Ca > 1) and orientation (Ca > 0.5).
    • Observed bubble relaxation to spherical shapes post-shear stress removal.

    Conclusions:

    • Established the range of capillary numbers for which theoretical models accurately predict bubble behavior.
    • Provided experimental data supporting the applicability of established theories in both low and high deformation limits.
    • Contributed to a comprehensive understanding of bubble dynamics in shear flows.