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Packed bed compression visualisation and flow simulation using an erosion-dilation approach

Johnson, TF; Iacoviello, F; Hayden, DJ; Welsh, JH; Levison, PR; Shearing, PR; Bracewell, DG; (2020) Packed bed compression visualisation and flow simulation using an erosion-dilation approach. Journal of Chromatography A , 1611 , Article 460601. 10.1016/j.chroma.2019.460601. Green open access

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Abstract

X-ray computed tomography has been demonstrated to be capable of imaging 1 mL (5 mm diameter, 50 mm height) chromatography packed beds under compression, visualising the 3D structure and measuring changes to geometry of the packing. 1 mL pre-packed columns did not exhibit any structural changes at vendor specified flow rate limits, however cellulose beds did compress at higher flow rates that were imaged before, during and after flow. This was used to visualise and quantitate changes to porosity, tortuosity and permeability based on simulation of flow through the packed bed structure using the imaging data. When using a high flow rate it was found that a decrease in porosity could be measured during compression before reverting after flow had ceased, with corresponding changes to tortuosity and permeability also occurring. X-ray CT imaging of packed beds and individual beads exposed to foulant-rich process streams resulted in considerable image quality loss, associated with residual biological material. In order to address this, digital processing using an erosion-dilation method was applied at bead and bed scales to computationally alter the porosity by adding or removing material from the existing surface to calculate the impact upon tortuosity factor. The eroded and dilated bead volumes of agarose, cellulose and ceramic materials were used to simulate diffusivity whilst mimicking internal bead pore constriction and blocking mechanisms.

Type: Article
Title: Packed bed compression visualisation and flow simulation using an erosion-dilation approach
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.chroma.2019.460601
Publisher version: https://doi.org/10.1016/j.chroma.2019.460601
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: X-ray computed tomography, Packed bed, Compression, Imaging, Structure
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10084768
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