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384 results on '"Peters, E.A.J.F."'

22. Numerical and experimental study of the flow distribution inside slender packed beds of spherocylindrical particles

Author

Fathiganjehlou, Ali, Romijn, Noah, Bergmans, Yasmine, Baltussen, Maike W., Buist, Kay A., Peters, E.A.J.F., Kuipers, J.A.M., Fathiganjehlou, Ali, Romijn, Noah, Bergmans, Yasmine, Baltussen, Maike W., Buist, Kay A., Peters, E.A.J.F., and Kuipers, J.A.M.

Abstract

In this paper, Magnetic Resonance Imaging (MRI) and a Pore Network Model (PNM) are used to characterize the flow in packed beds of spherocylindrical particles. PNM is chosen as it is a relatively fast numerical approach, which provides local information on the bed flow pattern. MRI scans of packed bed reactors provide detailed information on the bed structure and the flow. In this study, the packed beds are reconstructed from the MRI images. The impact of the image quality on the PNM’s flow field prediction is assessed. It is shown that improved image quality significantly enhances prediction accuracy. With a sufficient image quality, PNM is able to closely match MRI in predicting the flow fields and capture important characteristics such as wall channeling.

Published
2024

23. CFD-validated pore network modeling of packed beds of non-spherical particle

Author

Eghbalmanesh, Amirhossein, Fathiganjehlou, Ali, Rieder, David R., Hoogendoorn, Martijn, Miloshevska, Marijana, Baltussen, Maike W., Peters, E.A.J.F., Buist, Kay A., Kuipers, J.A.M., Eghbalmanesh, Amirhossein, Fathiganjehlou, Ali, Rieder, David R., Hoogendoorn, Martijn, Miloshevska, Marijana, Baltussen, Maike W., Peters, E.A.J.F., Buist, Kay A., and Kuipers, J.A.M.

Abstract

In this work, the hydrodynamics inside packed beds of particles with different shapes are investigated: spherical, cylindrical, and cubical particles. The cylindrical and cubical geometries contain sharp ridges, which give rise to complicated pore geometries. In this study, Pore Network Modeling (PNM) validated with the Particle-Resolved Computational Fluid Dynamics (PR-CFD) simulations of packed beds with these non-spherical particles will be reported. The results show that the PNM predicts the same average flow behavior and pore pressure variations as PR-CFD. However, the PNM prediction of the pressure values is less accurate at the pore level compared to the PR-CFD for the cubical particles.

Published
2024

24. Hydrodynamics in a randomly packed bed of spheres: A comparison between PR-CFD simulations and MRI experiments

Author

Eghbalmanesh, Amirhossein, Romijn, Noah, Baltussen, Maike W., Peters, E.A.J.F., Buist, Kay A., Kuipers, J.A.M., Eghbalmanesh, Amirhossein, Romijn, Noah, Baltussen, Maike W., Peters, E.A.J.F., Buist, Kay A., and Kuipers, J.A.M.

Abstract

Multitubular reactors are commonly used in industry for processes involving highly exothermic chemical reactions. This reactor type consists of individual tubes, with a small diameter compared to the particle size. These slender beds facilitate heat management, but also give rise to flow maldistribution, which decreases the reactor efficiency. The aim of this article is to validate particle-resolved simulations using Magnetic Resonance Imaging experiments while focusing on the flow maldistribution. The packing structure used in the simulations is reconstructed from the experimental images to facilitate a one-to-one comparison. A good match between experiments and simulations is found for the averaged flow profile, probability density function of the velocity in axial direction and even the local velocity distributions. However, a correction of the experimental results for magnetic susceptibility artifacts is necessary to obtain a similar match in the probability density functions and the local profiles.

Published
2024

25. Magnetic resonance imaging of trickle flow

Author

Fathiganjehlou, Ali, Buist, Kay A., Peters, E.A.J.F., de Graaf, A.H.J. (Larry), Kuipers, J.A.M., Fathiganjehlou, Ali, Buist, Kay A., Peters, E.A.J.F., de Graaf, A.H.J. (Larry), and Kuipers, J.A.M.

Abstract

Trickle bed reactors (TBR) are widely used in the chemical industries. These reactors involve gas and liquid flow through a catalyst-packed bed. For optimal TBR performance, it is crucial to achieve a uniform distribution of gas and liquid among the catalyst particles. However, in multitubular reactors with slender tubes, flow maldistribution near the tube walls is a common issue. Therefore, a comprehensive understanding of local phase and flow distribution is essential for designing and operating reactors with slender tubes. This article employs Magnetic Resonance Imaging (MRI) to characterize the three-dimensional distribution of the two-phase trickle flow within a slender tube. Three quantities are characterized: gas-liquid-solid distribution, particle wetting efficiency, and the flow field. Structure and flow MRI images are processed to calculate these quantities. Additionally, a novel postprocessing technique is introduced to determine the liquid distribution over individual particle surfaces. This distribution is determined at several axial and radial positions.

Published
2024

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