High-resolved X-ray tomography scan of dewatered filter cakes and sessile droplets
datacite.FundingReference.funderName | Deutsche Forschungsgemeinschaft | |
Contributing person | Technical University Bergakademie Freiberg - Institute of Mechanical Process Engineering and Mineral Processing | |
Contributing person | Löwer, Erik (orcid: 0000-0002-6956-8054) | |
Contributing person | German Research Foundation | |
Contributing person | Leißner, Thomas | |
Contributing person | Peuker, Urs Alexander | |
datacite.description.SeriesInformation | contact angle measurement of sessile droplets and liquid bridges within the pore space of a dewatered filter cake | |
datacite.description.TableOfContents | CF_035_055200_022a (in-situ flow cell cake dewatering, solid fraction 35 vol.-% of Al2O3 55 µm < x < 200 µm, internal high-resolution scan FOV 800x800 µm², centre of filter cake), CF_035_055200_023a (in-situ flow cell cake dewatering, solid fraction 35 vol.-% of Al2O3 55 µm < x < 200 µm, internal high-resolution scan FOV 800x800 µm², above filter cloth), CF_035_055200_023b (in-situ flow cell cake dewatering, solid fraction 35 vol.-% of Al2O3 55 µm < x < 200 µm, internal high-resolution scan FOV 800x800 µm², centre of filter cake), CF_035_055200_023c (in-situ flow cell cake dewatering, solid fraction 35 vol.-% of Al2O3 55 µm < x < 200 µm, internal high-resolution scan FOV 800x800 µm², centre of filter cake), CF_035_055200_023d (in-situ flow cell cake dewatering, solid fraction 35 vol.-% of Al2O3 55 µm < x < 200 µm, internal high-resolution scan FOV 800x800 µm², beneath cake surface), MR70_Gly_99.5_stat (sessile Glycerol droplet on rough, flat Al2O3 surface (MR70)), MR70_Gly_99.5_stat_02 (sessile Glycerol droplet on rough, flat Al2O3 surface (MR70)), MR70_Gly_99.5_stat_03 (sessile Glycerol droplet on rough, flat Al2O3 surface (MR70)), Saphir_Gly_99.5_stat (sessile Glycerol droplet on smooth, flat Al2O3 surface (monocrystalline sapphire)), Saphir_Gly_99.5_stat_02 (sessile Glycerol droplet on smooth, flat Al2O3 surface (monocrystalline sapphire)), Saphir_Gly_99.5_stat_03 (sessile Glycerol droplet on smooth, flat Al2O3 surface (monocrystalline sapphire)) | |
Documentation of the data | Resource Type: X-ray tomography scans of filter cakes and sessile droplets on flat surfaces (.tiff stacks) Methods: VDI 2762-1, VDI 2762-2 and VDI 2762-3 Data Acquisition: in-situ filtration and dewatering (downscaled pressure nutsch 5 mm diameter) according VDI 2762-2 and VDI 2762-3, sessile droplet shape contour analysis Data Processing: automatic centre shift, beam hardening correction (factor 0.05), gauss smoothing filter (kernel 0.7) see note parameter.png in each measurement file for further measurement and reconstruction parameters | |
References to related material | 10.1016/j.advwatres.2021.103894 | |
Description of the data | Publication E: Wetting behavior of porous structures: Three-dimensional determination of the contact angle after filter cake dewatering using X-ray microscopy(Paper_E) 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. | |
Type of the data | Dataset | |
Total size of the dataset | 7667011926 | |
Author | Löwer, Erik | |
Upload date | 2021-08-23T13:56:34Z | |
Upload date | 2026-06-05T11:16:46Z | |
Publication date | 2021-08-23T13:56:34Z | |
Publication date | 2026-06-05T11:16:46Z | |
Data of data creation | 2019-2020 | |
Publication date | 2021-08-23 | |
Abstract of the dataset | X-ray tomography image of dewatered filter cakes at irreducible saturation. The initial slurry contains Al2O3 particles suspended in a potassium iodide-glycerol solution. These were separated by cake-forming filtration with subsequent dewatering. All filtration and dewatering experiments took place in an in situ apparatus within the Zeiss Xradia 510 X-ray microscope. High resolution scans are acquired in the equilibrium state after dewatering at different locations within the cake structure to measure the local three-phase contact angle. The data are validated by sessile droplet experiments on substrates of the same material within the X-ray microscope. | |
dc.identifier | MR70_Gly_99.5_stat_02 | |
dc.identifier | Saphir_Gly_99.5_stat_03 | |
dc.identifier | Saphir_Gly_99.5_stat_02 | |
dc.identifier | MR70_Gly_99.5_stat_03 | |
dc.identifier | Saphir_Gly_99.5_stat | |
dc.identifier | CF_035_055200_022 | |
dc.identifier | CF_035_055200_023 | |
dc.identifier | MR70_Gly_99.5_stat | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/2527 | |
Public reference to this page | https://doi.org/10.25532/OPARA-124 | |
dc.language | eng | |
Licence | Attribution 4.0 International | |
URI of the licence text | http://creativecommons.org/licenses/by/4.0/ | |
Specification of the discipline(s) | 4::42::403::403-03 | |
Specification of the discipline(s) | 4 | |
Title of the dataset | High-resolved X-ray tomography scan of dewatered filter cakes and sessile droplets | |
dc.title.alternative | contact angle measurement of sessile droplets and liquid bridges within the pore space of a dewatered filter cake | |
Research instruments | X-ray microscope (ZEISS Xradia Versa 510) | |
Underlying research object | hydrophilic MARTOXID® Al2O3 (MR70), 5x5x4 mm³ fragment (manufacturer: Goodfellow GmbH) | |
Underlying research object | glycerol (manufacturer: Carl Roth, > 99,5 %) | |
Underlying research object | potassium iodide (manufacturer: Carl Roth, > 99 %, 25 mmol/l) | |
Underlying research object | Monocrystalline Al2O3 (Sapphire), 5x5x2.5 mm³ fragment (manufacturer: Goodfellow GmbH) | |
Underlying research object | gamma-Al2O3 (manufacturer: Almatis, solid powder, 55...200 µm) | |
Underlying research object | glycerol-water solution (manufacturer: Carl Roth, > 99,5 %, 24 m.-% glycerol) | |
Software | Xradia XMReconstructor (Version 11.1.8) | |
Project abstract | Reliable information about the micro-processes during filtration and dewatering of filter cakes allows more accurate statements about process development and design in any industrial application with solid-liquid separation units. Distributed particle properties such as shape, size, and material influence the porous network structure with considerable local fluctuations in vertical and horizontal alignment in the cake forming apparatus. The present work relates to a wide range of particle sizes and particle shapes and presents their effects on integral, but preferably local, structural parameters of cake-forming filtration. Current models for the relationship between particle properties and resulting porous structure remain inaccurate. Therefore, the central question focus on the model-based correlation between the obtained data and characteristic cake and process parameters. In combination with X-ray computed tomography and microscopy (ZEISS Xradia 510), data acquisition on the structural build-up of filter cakes is possible on a small scale (filter area 0.2 cm²) and a conventional laboratory scale (filter area 20 cm², VDI 2762 pressure nutsch). Thereby, the work focuses on structural parameters at the local level before, during, and after cake dewatering, such as porosity, coordination number, three-phase contact angle, characteristics of pores and isolated liquid regions, the liquid load of individual particles, tortuosity, and capillary length, and the corresponding spatial distributions. Seven different particle systems in the range of 20 and 500 µm, suspended in aqueous solutions with additives for contrast enhancement, served as the initial raw materials for the filter cake build-up. Image data processing from 16-bit greyscale images with a resolution of 2 to 4 µm/voxel edge length includes various operations from denoising filters and shape enhancement with two-stage segmentation to identify air, solid particles, and liquid phase, resulting in a machine learning-based automated approach. Subsequent modeling and correlation of measured parameters rely on experimentally verified quantities from mercury porosimetry, laser diffraction, dynamic image analysis, static and dynamic droplet contour analysis, as well as filtration and capillary pressure tests according to VDI guidelines. The tomography measurements provide microscopic information about the porous system, quantified using characteristic key parameters and distribution functions. | |
Project title | Development of process models based on 3D information about the multiphase processes in the pore space of a filter cake (DFG PE 1160/23-1) |
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