Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Posters II
DY 30.43: Poster
Thursday, March 25, 2010, 16:00–18:00, Poster C
Mechanical Properties of Wet Granulates — •Somnath Karmakar1, Martin Brinkmann2, Stephan Herminghaus2, Marco Di Michiel3, Mario Scheel3, Michael Sipahi1, and Ralf Seemann1,2 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 3ESRF, Grenoble, France
If a wetting liquid is added to dry granulates, the granulate turns into moldable material. This arises due to the formation of liquid capillary bridges and larger liquid clusters between adjacent grains, exerting an attractive force between granules. We study the mechanical properties (i.e. yield stress, critical fluidization and tensile strength) of wet granular materials with different size and for variable liquid contents and wettability. Our experimental results show that the mechanical properties of granulates wetted with a low contact angle liquid are largely independent on the liquid content over a wide range for all the applied mechanical tests. However, in case of a large contact angle liquid, the mechanical properties vary for the various mechanical tests and with the amount of liquid. To understand the mechanical behavior in more detail, we also image the sheared granulates by high speed X-ray micro-tomography.