Active hydrodynamic imaging of a rigid spherical particle.

Abstract:

:A body with mechanical sensors may remotely detect particles suspended in the surrounding fluid via controlled agitation. Here we propose a sensory mode that relies on generating unsteady flow and sensing particle-induced distortions in the flow field. We demonstrate the basic physical principle in a simple analytical model, which consists of a small spherical particle at some distance from a plate undergoing impulsive or oscillatory motion. The model shows that changes in pressure or shear on the plate can be used to infer the location and size of the sphere. The key ingredient is to produce strong shear or strain around the sphere, which requires careful tuning of the viscous boundary layer on the moving plate. This elucidates how some organisms and devices may control their unsteady dynamics to enhance their range of perception.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Takagi D,Strickler JR

doi

10.1038/s41598-020-58880-0

subject

Has Abstract

pub_date

2020-02-14 00:00:00

pages

2665

issue

1

issn

2045-2322

pii

10.1038/s41598-020-58880-0

journal_volume

10

pub_type

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