Controllable adhesion using field-activated fluids
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Hosoi_Controllable adhesion.pdf
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Author(s)
Ewoldt, Randy H.
Tourkine, Piotr
Hosoi, Anette E.
McKinley, Gareth H
Date Issued
July 2011
Journal
Physics of Fluids
Publisher
American Institute of Physics (AIP)
Citation
Ewoldt, Randy H., Piotr Tourkine, Gareth H. McKinley, and A. E. Hosoi. Controllable Adhesion Using Field-activated Fluids. Physics of Fluids 23(7): 073104, 2011.
Version
Author's final manuscript
Abstract
We demonstrate that field-responsive magnetorheological fluids can be used for variable-strength controllable adhesion. The adhesive performance is measured experimentally in tensile tests (a.k.a. probe-tack experiments) in which the magnetic field is provided by a cylindrical permanent magnet. Increasing the magnetic field strength induces higher peak adhesive forces. We hypothesize that the adhesion mechanism arises from the shear resistance of a yield stress fluid in a thin gap. This hypothesis is supported by comparing the experimentally measured adhesive performance to the response predicted by a lubrication model for a non-Newtonian fluid with a field-dependent yield stress. The model predictions are in agreement with experimental data up to moderate field strengths. Above a critical magnetic field strength the model over-predicts the experimentally measured values indicating non-ideal conditions such as local fluid dewetting from the surface.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1063/1.3608277
