Athermal two-dimensional granular systems are exposed to external mechanical noise leading to Brownian-like motion. Using tunable repulsive interparticle interaction, it is shown that the same microstructure as that observed in colloidal suspensions can be quantitatively recovered at a macroscopic scale.
R.Messina, S.Aljawhari, L.Bécu, J.Schockmel, G.Lumay, N.Vandewalle, Quantitatively mimicking wet colloidal suspensions with dry granular media, Scientific Reports 5, 10348 (2015) – Open access
In many industrial processes, foams are unwanted products. In order to destroy them, antifoaming agents are used… without really knowing how they act. Those antifoaming agents are dispersions of small particles, which need to break foam films efficiently. We have shown, for the first time, that buoyancy has an important part in the efficiency of those agents. In microgravity, we observed that foams added with antifoaming agent are stable for the duration of the experiment, whereas on Earth they start to disappear immediately.
We studied the deformation of an elastic pipe submitted to gravity and to an internal fluid flow. The pipe is clamped horizontally at one end and free at the other end. As the fluid velocity increases, the shape changes from an elastic beam deflected by its own weight towards an horizontal position.