Suppression of viscosity enhancement around a Brownian particle in a near-critical binary fluid mixture

研究成果: Article査読

抄録

We consider the Brownian motion of a rigid spherical particle in a binary fluid mixture, which lies in the homogeneous phase near the demixing critical point, assuming that neither component is more attracted by the particle surface. In a recent study, it was experimentally shown that the self-diffusion coefficient first decreases and then reaches a plateau as the critical point is approached. The decrease should reflect the critical enhancement of the viscosity, while the plateau was interpreted as representing the suppression of the enhancement due to the shear around the particle. To examine this interpretation, we take into account the local shear rate to calculate the dependence of the drag coefficient on the particle speed, and then utilize a Langevin equation to calculate the self-diffusion coefficient.

本文言語English
論文番号A21
ジャーナルJournal of Fluid Mechanics
DOI
出版ステータスAccepted/In press - 2020

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 機械工学

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