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Model reactive granular materials

by Jop - published on , updated on

Charles Voivret (Postdoc 2009-2010), Pierre Jop, Emmanuelle Gouillart

As a complement of the melting of reactive packings activity, we try to get information on the evolution of model-wet-granular system using simulation. This tool allows to access to the force network, nature of the neighboring grains, individual dynamic at the grain scale.

We focus on very crude model to enhance the physical role of the physical properties such as local packing fraction, or contact network. We then simulate granular system that mimic the glass batch reaction or the mixing of fluid and grains.


The simplest chemical reaction is implemented in a granular packing: some grains react and disappear. Under the confining pressure, the system rearranges as the time and the reaction proceed.

shear_heterogeneous_systems
The main effect of a droplet of fluid in a granular system is to create capillary bridges than strengthen the mechanical properties by cohesive forces. When a liquid is mixed with a granular media, before it spreads all over the system, the cohesion is not homogeneous spatially. What is the rheology of such mixture? How it evolves with time?

We performed numerical simulations of a rheological test of a heterogeneous granular material where the contact properties depend on the nature of neighboring grains.

Collaborations

François Chevoir, IFFSTAR.

Olivier Dauchot, ESPCI.