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Long-term influence of fluid inertia on the diffusion of a Brownian particle.

Pesce, G; Volpe, G; Volpe, G; Sasso, A; (2014) Long-term influence of fluid inertia on the diffusion of a Brownian particle. Phys Rev E Stat Nonlin Soft Matter Phys , 90 (4) 042309 - ?. 10.1103/PhysRevE.90.042309. Green open access

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Abstract

We experimentally measure the effects of fluid inertia on the diffusion of a Brownian particle at very long time scales. In previous experiments, the use of standard optical tweezers introduced a cutoff in the free diffusion of the particle, which limited the measurement of these effects to times comparable with the relaxation time of the fluid inertia, i.e., a few milliseconds. Here, by using blinking optical tweezers, we detect these inertial effects on time scales several orders longer up to a few seconds. The measured mean square displacement of a freely diffusing Brownian particle in a liquid shows a deviation from the Einstein-Smoluchowsky theory that diverges with time. These results are consistent with a generalized theory that takes into account not only the particle inertia but also the inertia of the surrounding fluid.

Type: Article
Title: Long-term influence of fluid inertia on the diffusion of a Brownian particle.
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevE.90.042309
Publisher version: http://dx.doi.org/10.1103/PhysRevE.90.042309
Language: English
Additional information: the author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged. If a fee is charged, then APS permission must be sought. In all cases, the appropriate bibliographic citation and notice of the APS copyright must be included.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1455978
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