Person

Kasper van der Vaart

This person is no longer with EPFL

Related publications (12)

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Breaking size-segregation waves and mobility feedback in dense granular avalanches.

Christophe Ancey, Kasper van der Vaart

Through experiments and discrete particle method (DPM) simulations we present evidence for the existence of a recirculating structure, that exists near the front of dense granular avalanches, and is known as a breaking size-segregation (BSS) wave. This is ...

2018

Segregation of large particles in dense granular flows suggests a granular Saffman effect

Christophe Ancey, Kasper van der Vaart

We report on the scaling between the lift force and the velocity lag experienced by a single particle of different size in a monodisperse dense granular chute flow. The similarity of this scaling to the Saffman lift force in (micro-) fluids, suggests an in ...

2018

Particle size-segregation in granular ows driven by a conveyor belt.

Christophe Ancey, Tomás Alfredo Trewhela Palacios, Kasper van der Vaart

Particle motion within the leading edge of bidisperse gravity-driven granular flows is affected by particle size segregation. Shear-induced segregation causes coarse particles to move towards the upper layers. Then, these are advected down to the tip regio ...

2018

Particle Size Segregation in Dense Granular Flows

Kasper van der Vaart

Flows of granular materials widely occur in many industrial and natural environments. Particle-size segregation---the separation of grains of different sizes during flow---plays a crucial role in the behaviour of such flows. In spite of considerable effort ...

EPFL2016

Debris and pyroclastic flows often have bouldery flow fronts, which act as a natural dam resisting further advance. Counter intuitively, these resistive fronts can lead to enhanced run-out, because they can be shouldered aside to form static levees that se ...

Cambridge University Press2016

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We experimentally study particle scale dynamics during segregation of a bidisperse mixture under oscillatory shear. Large and small particles display an underlying asymmetry that is dependent on the local particle concentration, with small particles segreg ...

American Physical Society2015

Asymmetric Particle Behavior during Size Segregation

Christophe Ancey, Kasper van der Vaart

We have performed oscillatory shear experiments on a bidisperse granular mixture in combination with refractive index matched scanning in order to resolve particle motion in three-dimensions during size-segregation. We find that small particles segregate f ...

2015

Asymmetry in Size-Segregation Rates.

Christophe Ancey, Gaël Epely Chauvin, Kasper van der Vaart

We show experimentally and by comparison with theory that during particle size-segregation in a sheared granular flow large particles rise slower in regions of many small particles and small particles sink faster in regions of many large particles. Binary ...

2014

Breaking Size-Segregation Waves in Granular Avalanches

Christophe Ancey, Kasper van der Vaart

We experimentally prove the existence of the theoretically predicted breaking size-segregation wave within a binary granular avalanche. This complex structure involves the recirculation of particles through a pattern of shocks and rarefaction waves, and ca ...

2014

Breaking Size-Segregation Waves in Granular Avalanches

Christophe Ancey, Kasper van der Vaart

2014