Helical inner-wall texture prevents jamming in granular pipe flows

Verbücheln, Felix; Parteli, Eric J. R.; Pöschel, Thorsten

doi:10.1039/c5sm00760g

Cited by 30 publications

(29 citation statements)

References 47 publications

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“…The symbols denote simulation data for different particle shapes as defined in table 1, while the continuous line denote the best fit to these data using the equations, characteristics have been considered the same in all simulations since the present work is focused on the effect of particle shape. Moreover, we have also performed simulations by including tangential forces as in previous works [26,33,48,49] and found that the conclusions of the present manuscript do not change when friction is taken into account. That is, the same dissipative behavior of the granular damper is observed if friction is included, which means roughly shape-independent values of dissipated energy in the collect-and-collide regime and larger dissipation for spherical particles in the gas-like regime compared to complex particle shapes.…”

Section: Discussionsupporting

confidence: 58%

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Granular dampers: does particle shape matter?

2016

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By means of particle-based numerical simulations using the discrete element method, we address the question of how the performance of granular dampers is affected by the shape of the granular particles. In consistence with previous experiments performed with nearly spherical particles we find that independently of the particles' shape, the granular system is characterized by a gas-like regime for small amplitudes of the container's oscillation and by a collect-and-collide regime for large amplitude forcing. Both regimes are separated by an optimal operation mode-the critical amplitude of the damping oscillation for which the energy dissipation is maximal-which is independent of the particle shape for given conditions of particle mass, material properties and number of particles. However, in the gas-like regime, we find that spherical particles lead to more efficient energy dissipation compared to complex shaped particles of the same mass. In this regime, a dependence on the damper's efficiency on the particle shape is found. performance and operation mode of granular dampers, that is, the average value of total dissipated energy per oscillation cycle, in response to the vibration amplitude [28,29].

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Section: Discussionsupporting

confidence: 58%

“…The equations used for computing the interactions between the particles and the walls of the damper are the same used to calculate the inter-particle interaction forces, with one of the contact partners being of infinite mass and radius [33,48,49].…”

Section: Simulation Of the Granular Dampermentioning

confidence: 99%

Granular dampers: does particle shape matter?

2016

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“…Nevertheless, there are many other systems-such as particle rafts [35], pedestrian flows [36], and colloids [37]-where, commonly, the distance to the walls in the enclosure previous to the bottleneck is small and is therefore expected to affect clogging. Moreover, for the case of very narrow silos, this work raises new questions, such as if a small asymmetry of the outlet position is able to further prevent clogging or whether there is a smooth transition to a situation where the silo width equals the outlet size, i.e., the case of clogging in pipe flow [38,39].…”

Section: Discussionmentioning

confidence: 99%

Linking bottleneck clogging with flow kinematics in granular materials: The role of silo width

et al. 2017

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We demonstrate experimentally that clogging in a silo correlates with some features of the particle velocities in the outlet proximities. This finding, that links the formation of clogs with a kinematic property of the system, is obtained by looking at the effect that the position of the lateral walls of the silo has on the flow and clogging behavior. Surprisingly, the avalanche size depends nonmonotonically on the distance of the outlet from the lateral walls. Apart from evidencing the relevance of a parameter that has been traditionally overlooked in bottleneck flow, this nonmonotonicity supposes a benchmark with which to explore the correlation of clogging probability with different variables within the system. Among these, we find that the velocity of the particles above the outlet and their fluctuations seem to be behind the nonmonotonicity in the avalanche size versus wall distance curve.

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“…Another modification can be inspired by the recent work [42] where angular velocity component is forced onto granular flow by spiral structures, not unlike rifling of gun barrels. If such rifling were possible in a microfluidic channel, it could also be used to induce inertial ratchet effect.…”

Section: Discussionmentioning

confidence: 99%

Inertial hydrodynamic ratchet: Rectification of colloidal flow in tubes of variable diameter

Slanina

2016

Phys. Rev. E

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We investigate analytically a microfluidic device consisting of a tube with non-uniform but spatially periodic diameter, where a fluid driven back and forth by a pump carries colloidal particles. Although the net flow of the fluid is zero, the particles move preferentially in one direction due to ratchet mechanism, which occurs by simultaneous effect of inertial hydrodynamics and Brownian motion. We show that the average current is strongly sensitive to particle size, thus facilitating colloidal particle sorting.

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Helical inner-wall texture prevents jamming in granular pipe flows

Cited by 30 publications

References 47 publications

Granular dampers: does particle shape matter?

Granular dampers: does particle shape matter?

Linking bottleneck clogging with flow kinematics in granular materials: The role of silo width

Inertial hydrodynamic ratchet: Rectification of colloidal flow in tubes of variable diameter

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