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Propulsion of a Two-Sphere Swimmer.

Daphne Klotsa1,2,3, Kyle A Baldwin1, Richard J A Hill1

  • 1School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.

Physical Review Letters
|December 27, 2015
PubMed
Summary
This summary is machine-generated.

A neutrally buoyant swimmer, composed of two spheres linked by a spring, achieves propulsion in a vibrating fluid. Its swimming speed correlates with streaming Reynolds number, indicating a critical threshold for motion initiation.

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Area of Science:

  • Fluid dynamics
  • Non-Newtonian fluid mechanics
  • Robotics and micro-robotics

Background:

  • Understanding micro-swimmers is crucial for targeted drug delivery and environmental monitoring.
  • Vibrating fluids can induce complex flow patterns and particle motion.
  • The propulsion mechanisms of oscillating bodies in fluids are not fully understood.

Purpose of the Study:

  • To investigate the propulsion of a two-sphere swimmer in a vibrating fluid.
  • To determine the relationship between swimming speed and fluid vibration parameters.
  • To elucidate the underlying fluid dynamics responsible for swimmer propulsion.

Main Methods:

  • Experimental setup with a neutrally buoyant two-sphere swimmer.
  • Numerical simulations of fluid-structure interaction.
  • Analysis of fluid flow patterns using particle image velocimetry (PIV) and simulation data.

Main Results:

  • Both experiments and simulations show that the swimmer achieves propulsion in a vibrating fluid.
  • Swimming speed scales with the streaming Reynolds number, indicating a critical onset value.
  • Flow patterns transition from independent sphere oscillations to a collective flow around the swimmer.

Conclusions:

  • The study demonstrates a novel method for propelling micro-swimmers using fluid vibrations.
  • Propulsion is linked to streaming flows and a critical streaming Reynolds number.
  • The findings offer insights into the design of artificial micro-swimmers and understanding biological systems.