We experimentally study the detachment of drops of granular suspensions using a density matched model suspension with varying grain volume fraction (ϕ = 15% to 55%) and grain diameter (d = 20 μm to 140 μm). We show that at the beginning of the detachment process, the suspensions behave as an effective fluid. The detachment dynamics in this regime can be entirely described by the shear viscosity of the suspension [R. J. Furbank and J. F. Morris, Int. J. Multiphase Flow 33(4), 448–468 (2007)]. At later stages of the detachment, the dynamics become independent of the volume fraction and are found to be identical to the dynamics of the interstitial fluid. Surprisingly, visual observation reveals that at this stage, particles are still present in the neck. We suspect rearrangements of particles to locally free the neck of grains, causing the observed dynamics. Close to the final pinch off, the detachment of the suspensions is further accelerated, compared to the dynamics of pure interstitial fluid. This acceleration might be due to the fact that the neck diameter gets of the order of magnitude of the size of the grains and a continuous thinning of the liquid thread is not possible any more. The crossover between the different detachment regimes is a function of the grain size and the initial volume fraction. We characterize the overall acceleration as a function of the grain size and volume fraction.
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April 2012
Research Article|
April 27 2012
Accelerated drop detachment in granular suspensions
Claire Bonnoit;
Claire Bonnoit
a)
Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI, UPMC,
Université Paris Diderot
, 10, rue Vauquelin, 75231 Paris Cedex 05, France
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Thibault Bertrand;
Thibault Bertrand
Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI, UPMC,
Université Paris Diderot
, 10, rue Vauquelin, 75231 Paris Cedex 05, France
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Eric Clément;
Eric Clément
Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI, UPMC,
Université Paris Diderot
, 10, rue Vauquelin, 75231 Paris Cedex 05, France
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Anke Lindner
Anke Lindner
Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI, UPMC,
Université Paris Diderot
, 10, rue Vauquelin, 75231 Paris Cedex 05, France
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Claire Bonnoit
a)
Thibault Bertrand
Eric Clément
Anke Lindner
Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR 7636 CNRS, ESPCI, UPMC,
Université Paris Diderot
, 10, rue Vauquelin, 75231 Paris Cedex 05, France
a)
C. Bonnoit and T. Bertrand contributed equally to this work.
b)
Electronic mail: [email protected].
Physics of Fluids 24, 043304 (2012)
Article history
Received:
August 03 2011
Accepted:
March 05 2012
Citation
Claire Bonnoit, Thibault Bertrand, Eric Clément, Anke Lindner; Accelerated drop detachment in granular suspensions. Physics of Fluids 1 April 2012; 24 (4): 043304. https://doi.org/10.1063/1.4704801
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