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The wetting behavior of remaining isolated liquid bridges between particle interfaces determines the efficiency of filter cake dewatering. Micro-processes during and after dewatering can be traced by means of direct X-ray microtomography (ZEISS Xradia 510 Versa) providing insights into the filter cake structure. We measure the local contact angle between the immiscible phases on the pore scale after in-situ filter cake dewatering. By tracing the three-phase contact line and the two perpendicular vectors belonging to the solid and liquid surface, the contact angle is obtained from their scalar product at every mesh-node. The range of the resulting distribution and curvature increases with the degree of roughness, becoming more obvious for larger contact angles. The occurring roughness causes a naturally water-repellent surface and leads to low liquid saturations. The resulting angular distribution serves for a more accurate prediction of multiphase flow in pore networks as input for further pore model enhancement.
Appendices to the data collections of the following publications: - Publication A: Study on the influence of solids volume fraction on filter cake structures using micro tomography - Publication B: Neighborhood Relationships of Widely Distributed and Irregularly Shaped Particles in Partially Dewatered Filter Cakes - Publication C: Insight into filter cake structures using micro tomography: The dewatering equilibrium - Publication D: Network model of porous media – Review of old ideas with new methods - Publication E: Wetting behavior of porous structures: Three-dimensional determination of the contact angle after filter cake dewatering using X-ray microscopy The data collection contains tomographic images (ZEISS Xradia 510 Versa) of partially dewatered filter cakes according to VDI 2762. The images include filter cake structures from additional particle systems such as mica, limestone, quartz, dolomite and glass particles and thus complement the reference system of aluminum oxide particles (publications A to E). All particles are between 50 and 200 µm in size, and their shape varies from spherical to cubic to fibrous and plate-like.