Numerical study of cylindrical particles' orientation in narrow packed beds

Niegodajew, Paweł; Gruszka, K.; Marek, Maciej

doi:10.1016/j.powtec.2021.03.069

Cited by 10 publications

(1 citation statement)

References 60 publications

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“…With the presence of a thermowell, the re-ordering of a packing should therefore affect the local void fraction as well as the particle orientation in a much more pronounced way than it does for spheres. In addition, it is necessary to consider that the packed bed structure is subject to statistical variations, − when investigating the influence of the thermowell on transport phenomena. It is still an unresolved challenge to quantify the impact of the thermowell on fluid flow and transport phenomena statistically and to derive a relation between the measured temperatures inside the thermowell and the temperatures in the center of an undisturbed packed bed.…”

Section: Introductionmentioning

confidence: 99%

How Temperature Measurement Impacts Pressure Drop and Heat Transport in Slender Fixed Beds of Raschig Rings

et al. 2022

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The axial temperature profile of a packed bed is often measured by thermocouples placed either directly in the bed or inside a thermowell centered in the reactor tube. Quantifying the impact of the thermocouple well on fluid flow, heat transport, and consequently on the measured temperatures is still an unresolved challenge for lab-scale reactors but especially, and even more so for multitubular reactors in industry. Particle-resolved computational fluid dynamics (PRCFD) simulations are a suitable approach to investigate the changes in transport phenomena exerted by inserting thermocouple wells into packed beds because they take into account the local packed bed structures. In this study, PRCFD simulations are performed based on design of simulation experiments (DoSE). The effect of the thermowell diameter and its thermal conductivity on the deviations between packed beds with and without thermowells is statistically quantified for characteristic integral quantities like pressure drop and tube wall-bed Nusselt number. The axial temperature profiles inside the thermowells can be computed efficiently with reasonably accuracy applying the Nusselt number correction as derived in this study from the DoSE in a one-dimensional pseudo-homogeneous energy balance.

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Section: Introductionmentioning

confidence: 99%

How Temperature Measurement Impacts Pressure Drop and Heat Transport in Slender Fixed Beds of Raschig Rings

et al. 2022

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A systematic approach to defining a unit cell for fluid dynamics in packed beds with low tube‐to‐particle diameter ratio

Dorantes‐Landa,

Hernandez‐Aguirre,

Ricardez‐Sandoval

et al. 2024

AIChE Journal

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This work develops an approach to identify the suitable representative volume (unit cell) that captures fluid dynamics in beds packed with spheres or cylinders with a dt/dp ≤ 10, by describing radial void fraction and velocity profiles at particle Reynolds numbers between 5 and 100. Rigid‐body simulations were used to construct synthetic packings, while velocity profiles were obtained from particle‐resolved simulations. This methodology, rooted in the similitude of fluid dynamics between beds of different lengths, determines the minimum length (or number of particles in a bed) required for the unit cell to accurately describe the void fraction and velocity profiles. Defining such a unit cell for fluid dynamics not only reduces computational effort but also opens avenues for its use in multiscale techniques to develop reliable pseudo‐continuous models, which is currently the bottleneck in the design and optimization of wall‐cooled packed‐bed reactors in industrial scenarios.

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Image processing of computed tomography scanned poly-dispersed beds for computational fluid dynamic studies

Kyrimis,

Raja,

Armstrong

2023

Advanced Powder Technology

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Numerical study of cylindrical particles' orientation in narrow packed beds

Cited by 10 publications

References 60 publications

How Temperature Measurement Impacts Pressure Drop and Heat Transport in Slender Fixed Beds of Raschig Rings

How Temperature Measurement Impacts Pressure Drop and Heat Transport in Slender Fixed Beds of Raschig Rings

A systematic approach to defining a unit cell for fluid dynamics in packed beds with low tube‐to‐particle diameter ratio

Image processing of computed tomography scanned poly-dispersed beds for computational fluid dynamic studies

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