Rotating tensiometer for the measurement of the elastic modulus of deformable particles

Massimiliano M. Villone, Howard A. Stone

Research output: Contribution to journalArticlepeer-review

Abstract

In a spinning drop tensiometer, the interfacial tension between two immiscible fluids can be inferred from the equilibrium shape of a drop suspended in a denser rotating immiscible liquid [B. Vonnegut, Rev. Sci. Instrum. 13, 6 (1942)RSINAK0034-674810.1063/1.1769937]. For small deformations of the droplet, an analytical solution for the droplet's shape exists [H. A. Stone and J. W. M. Bush, Q. Appl. Math. 54, 551 (1996)QAMAAY0033-569X10.1090/qam/1402409]. Similarly, we derive an analytical solution for the deformation dynamics of an initially spherical elastic particle suspended in a denser viscous rotating liquid. At long times, the particle attains a steady-state deformed shape that depends on the rotational Bond number, from which it is possible to get a measurement of the particle's elastic modulus, thus giving a proof of concept for a rotating tensiometer. Direct numerical simulations are used to validate the theory and identify its limits of applicability.

Original languageEnglish (US)
Article number083606
JournalPhysical Review Fluids
Volume5
Issue number8
DOIs
StatePublished - Aug 2020

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Modeling and Simulation
  • Fluid Flow and Transfer Processes

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