Capillary Breakup of Discontinuously Rate Thickening Suspensions
Author(s)Zimoch, Pawel Jerzy; McKinley, Gareth H; Hosoi, Anette E.
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Using discontinuously rate thickening suspensions (DRTS) as a model system, we show that beads-on-a-string morphologies can arise as a result of external viscous drag acting during capillary-driven breakup of a non-Newtonian fluid. To minimize the perturbative effect of gravity, we developed a new experimental test platform in which the filament is supported in a horizontal position at the surface of an immiscible oil bath. We show that the evolution of thin DRTS filaments during the capillary thinning process is well described by a set of one-dimensional slender filament equations. The strongly rate-dependent rheology of the test fluid and the aspect ratio of the filament couple to control the thinning dynamics and lead to a simple criterion describing the localized arrest of the capillary thinning process and the subsequent formation of complex, high aspect ratio beads-on-a-string structures. ©2013 American Physical Society.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory
Physical Review Letters
American Physical Society (APS)
Zimoch, Pawel J. et al., "Capillary Breakup of Discontinuously Rate Thickening Suspensions." Physical Review Letters 111, 3 (July 2013): 036001 doi. 10.1103/PhysRevLett.111.036001 ©2013 Authors
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