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This article is cited in 8 scientific papers (total in 8 papers)
A Coin Vibrational Motor Swimming at Low Reynolds Number
Alice C. Quillena, Hesam Askaria, Douglas H. Kelleya, Tamar Friedmannab, Patrick W. Oakesa a University of Rochester, Rochester, NY, 14627, USA
b Dept. of Mathematics and Statistics, Smith College, Northampton, MA, 01063, USA
Abstract:
Low-cost coin vibrational motors, used in haptic feedback, exhibit rotational internal motion inside a rigid case.
Because the motor case motion exhibits rotational symmetry, when placed into a fluid such as glycerin, the motor
does not swim even though its oscillatory motions induce steady streaming in the fluid. However, a piece of rubber
foam stuck to the curved case and giving the motor neutral buoyancy also breaks the rotational symmetry allowing it to swim.
We measured a 1 cm diameter coin vibrational motor swimming in glycerin at a speed of a body length in 3 seconds or at 3 mm/s.
The swim speed puts the vibrational motor in a low Reynolds number regime similar to bacterial motility, but because of the oscillations
of the motor it is not analogous to biological organisms. Rather the swimming vibrational motor may inspire small inexpensive robotic swimmers
that are robust as they contain no external moving parts.
A time dependent Stokes equation planar sheet model suggests that the swim speed depends on a steady streaming velocity $V_{stream} \sim Re_s^{1/2} U_0$
where $U_0$ is the velocity of surface oscillations, and streaming Reynolds number $Re_s = U_0^2/(\omega \nu)$ for motor angular frequency $\omega$ and fluid
kinematic viscosity $\nu$.
Keywords:
swimming models, hydrodynamics, nonstationary 3-D Stokes equation, bio-inspired micro-swimming devices.
Received: 30.08.2016 Accepted: 10.12.2016
Citation:
Alice C. Quillen, Hesam Askari, Douglas H. Kelley, Tamar Friedmann, Patrick W. Oakes, “A Coin Vibrational Motor Swimming at Low Reynolds Number”, Regul. Chaotic Dyn., 21:7-8 (2016), 902–917
Linking options:
https://www.mathnet.ru/eng/rcd235 https://www.mathnet.ru/eng/rcd/v21/i7/p902
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Abstract page: | 165 | References: | 34 |
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