Spatial Crossover Between Far-From-Equilibrium and Near-Equilibrium Dynamics in Locally Driven Suspensions

Ilya Svetlizky and Yael Roichman
Phys. Rev. Lett. 127, 038003 – Published 16 July 2021
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Abstract

We examine the response of a quasi-two-dimensional colloidal suspension to a localized circular driving induced by optical tweezers. This approach allows us to resolve over 3 orders of magnitude in the Péclet number (Pe) and provide a direct observation of a sharp spatial crossover from far- to near-thermal-equilibrium regions of the suspension. In particular, particles migrate from high to low Pe regions and form strongly inhomogeneous steady-state density profiles with an emerging length scale that does not depend on the particle density and is set by Pe1. We show that the phenomenological two phase fluid constitutive model is in line with our results.

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  • Received 1 November 2020
  • Revised 24 May 2021
  • Accepted 9 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.038003

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & ThermodynamicsPolymers & Soft Matter

Authors & Affiliations

Ilya Svetlizky1,2 and Yael Roichman1,3

  • 1School of Chemistry, Tel-Aviv University, Tel-Aviv 6997801, Israel
  • 2School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
  • 3School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 6997801, Israel

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Issue

Vol. 127, Iss. 3 — 16 July 2021

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