Journal
PHYSICS OF FLUIDS
Volume 23, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3608277
Keywords
adhesion; lubrication; magnetohydrodynamics; magnetorheology; non-Newtonian flow; non-Newtonian fluids; yield stress
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Funding
- U.S. Army Research Laboratory
- U.S. Army Research Office [W911NF-08-C-0055]
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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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3608277]
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