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Energies
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Fluid Flow Analysis of Spouted Beds
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Fluid Flow Analysis of Spouted Beds

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (10 June 2021) | Viewed by 7233

Special Issue Editors

Prof. Dr. Elisabetta Arato

E-Mail Website
Guest Editor
Department of Civil, Chemical and Environmental Engineering, University of Genoa, 16126 Genova GE, Italy
Interests: simulation; innovative processes; waste valorisation; thermochemical processes
Dr. Cristina Moliner

E-Mail Website
Guest Editor
Department of Civil, Chemical and Environmental Engineering, University of Genoa, 16126 Genova GE, Italy
Interests: multiscale modelling, thermo-chemical processes, biomass, renewable energies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The development of Spouted Beds requires, among others, extensive experimental data and accurate models describing the complex fluid dynamics, reactions and separation processes. Significant efforts are devoted to the understanding of these reactors due to their complex interactions among the phases. The challenge of modelling these complex systems is the selection of an accurate description, avoiding unnecessarily high degrees of complexity or studying phenomena that are negligible on larger scales but may become relevant at smaller scales. Also, the accuracy of such models is limited to the required numerous empirical model parameters. In addition, complex geometrical configurations are increasingly being applied which need benchmarking data for CFD validation.

More efficient, reliable and predictable Spouted Bed reactors still need further advance on their fundamental understanding, their scale-up approaches, their intensification strategies and their model development and validation.

The current Special Issue aims to collect the most recent advances in this field, covering from fundamental understanding of Spouted Beds, experimental activities in novel configurations, scale-up methodologies, benchmarking data and multiscale simulations, from lower scale - molecular and particle level - to macroscale, with special emphasis on their complementarities. Modelling based on data-driven analysis is also welcome. Experimental and simulation works may be in the framework of any of the wide range of applications in which the use of this technology provides clear advantages against other conventional fluidisation process schemes.

Prof. Elisabetta Arato
Dr. Cristina Moliner
Guest Editors

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Spouted Bed
  • Scale-up
  • Benchmarking data
  • Multiphase interactions
  • Multiscale modelling
  • CFD simulations
  • Data-driven modelling

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Published Papers (3 papers)

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Research

20 pages, 8501 KiB  
Article
CFD-DEM Simulation of Spouted Bed Dynamics under High Temperature with an Adhesive Model
by Zhao Chen, Lin Jiang, Mofan Qiu, Meng Chen, Rongzheng Liu and Malin Liu
Energies 2021, 14(8), 2276; https://doi.org/10.3390/en14082276 - 18 Apr 2021
Cited by 4 | Viewed by 2251
Abstract
Particle adhesion is of great importance to coating processes due to its effect on fluidization. Currently, Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) has become a powerful tool for the study of multiphase flows. Various contact force models have also been proposed. However, particle [...] Read more.
Particle adhesion is of great importance to coating processes due to its effect on fluidization. Currently, Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) has become a powerful tool for the study of multiphase flows. Various contact force models have also been proposed. However, particle dynamics in high temperature will be changed with particle surface properties changing. In view of this, an adhesion model is developed based on approaching-loading-unloading-detaching idea and particle surface change under high temperature in this paper. Analyses of the adhesion model are given through two particle collision process and validated by experiment. Effects of inlet gas velocity and adhesion intensity on spouted bed dynamics are investigated. It is concluded that fluidization cycle will be accelerated by adhesion, and intensity of fluidization will be marginally enhanced by slight adhesion. Within a certain range, increasing inlet gas velocity will lead to strong intensity of particle motion. A parameter sensitivity comparison of linear spring-damping model and Hertz-Mindlin Model is given, which shows in case of small overlaps, forces calculated by both models have little distinction, diametrically opposed to that of large overlaps. Full article
(This article belongs to the Special Issue Fluid Flow Analysis of Spouted Beds)
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22 pages, 5528 KiB  
Article
Mathematical Modeling and Pointwise Validation of a Spouted Bed Using an Enhanced Bed Elasticity Approach
by Sebastián Uribe, Binbin Qi, Omar Farid and Muthanna Al-Dahhan
Energies 2020, 13(18), 4738; https://doi.org/10.3390/en13184738 - 11 Sep 2020
Cited by 4 | Viewed by 1778
Abstract
With a Euler–Euler (E2P) approach, a mathematical model for predicting the pointwise hydrodynamic behavior of a spouted bed was implemented though computational fluid dynamics (CFD) techniques. The model considered a bed elasticity approach in order to reduce the number of required sub-models to [...] Read more.
With a Euler–Euler (E2P) approach, a mathematical model for predicting the pointwise hydrodynamic behavior of a spouted bed was implemented though computational fluid dynamics (CFD) techniques. The model considered a bed elasticity approach in order to reduce the number of required sub-models to provide closure for the solids stress strain-tensor. However, no modulus of elasticity sub-model for a bed elasticity approach has been developed for spouted beds, and thus, large deviations in the predictions are obtained with common sub-models reported in literature. To overcome such a limitation, a new modulus of elasticity based on a sensitivity analysis was developed and implemented on the E2P model. The model predictions were locally validated against experimental measurements obtained in previous studies. The experimental studies were conducted using our in-house developed advanced γ-ray computed tomography (CT) technique, which allows to obtain the cross-sectional time-averaged solids holdup distribution. When comparing the model predictions against the experimental measurements, a high predictive quality for the radial solids holdup distribution in the spout and annulus regions is observed. The model predicts most of the experimental measurements for different particle diameters, different static bed heights, and different inlet velocities with deviations under 15%, with average absolute relative errors (AARE) between 5.75% and 7.26%, and mean squared deviations (MSD) between 0.11% and 0.24% Full article
(This article belongs to the Special Issue Fluid Flow Analysis of Spouted Beds)
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13 pages, 2609 KiB  
Article
Experimental Study on the Solids Residence Time Distribution in Multiple Square-Based Spouted Beds
by Filippo Marchelli, Massimo Curti, Mattia Tognin, Giorgio Rovero, Cristina Moliner, Elisabetta Arato and Barbara Bosio
Energies 2020, 13(18), 4694; https://doi.org/10.3390/en13184694 - 9 Sep 2020
Cited by 4 | Viewed by 2596
Abstract
The present work aims at investigating the residence time distribution (RTD) of a multiple spouted bed reactor, which will be applied for the pyrolysis and gasification of residual biomass. The unit is composed of square-based spouted beds, placed in series and at descending [...] Read more.
The present work aims at investigating the residence time distribution (RTD) of a multiple spouted bed reactor, which will be applied for the pyrolysis and gasification of residual biomass. The unit is composed of square-based spouted beds, placed in series and at descending heights, and communicating with each other through an opening in the lateral wall. The gas is fed evenly in parallel. The experimental analysis is based on tracer experiments in cold-flow units, assessing the influence of the number of units and the bed height. The tests proved the good mixing properties of the spouted beds, which create a stable fluidization regime and do not feature dead zones. Each spouted bed can generally be well assimilated to an ideal continuous stirred tank reactor (CSTR). The RTD of the device seems adequate for the application, and also seems to be well tuneable through the selection of the bed height and number of units. Given the good similarity with ideal reactor networks, these represent a valid tool to estimate the final behavior in terms of RTD. Full article
(This article belongs to the Special Issue Fluid Flow Analysis of Spouted Beds)
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