Impact dynamics of a solid sphere falling into a viscoelastic micellar fluid

Benjamin Akers, Andrew Belmonte

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

We present an experimental study of the impact of a solid sphere on the free surface of a viscoelastic wormlike micellar fluid. Spheres of various densities and diameters are dropped from different heights above the fluid surface, reaching it with a nonzero velocity which determines the subsequent dynamics. Measurements of the initial sphere penetration are found to scale with the ratio of the kinetic energy of the sphere at impact to the elastic modulus of the fluid. The cavity formed in the wake of the sphere, observed with high-speed video imaging, also undergoes transitions from a smooth to fractured surface texture, dependent on both the Deborah number and the ratio of the gravitational force to elasticity.

Original languageEnglish (US)
Pages (from-to)97-108
Number of pages12
JournalJournal of Non-Newtonian Fluid Mechanics
Volume135
Issue number2-3
DOIs
StatePublished - May 30 2006

Fingerprint

falling spheres
Viscoelastic Fluid
Fluids
fluids
Fluid
Surface Texture
Elastic Modulus
Wake
Kinetic energy
Penetration
wakes
Free Surface
Elasticity
Experimental Study
modulus of elasticity
Cavity
High Speed
penetration
textures
elastic properties

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Applied Mathematics

Cite this

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Impact dynamics of a solid sphere falling into a viscoelastic micellar fluid. / Akers, Benjamin; Belmonte, Andrew.

In: Journal of Non-Newtonian Fluid Mechanics, Vol. 135, No. 2-3, 30.05.2006, p. 97-108.

Research output: Contribution to journalArticle

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AU - Belmonte, Andrew

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AB - We present an experimental study of the impact of a solid sphere on the free surface of a viscoelastic wormlike micellar fluid. Spheres of various densities and diameters are dropped from different heights above the fluid surface, reaching it with a nonzero velocity which determines the subsequent dynamics. Measurements of the initial sphere penetration are found to scale with the ratio of the kinetic energy of the sphere at impact to the elastic modulus of the fluid. The cavity formed in the wake of the sphere, observed with high-speed video imaging, also undergoes transitions from a smooth to fractured surface texture, dependent on both the Deborah number and the ratio of the gravitational force to elasticity.

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