Intermittent Drying of Soybeans in Conical Spouted Beds: Modeling Approach

Brito, Ronaldo Correia de; Tellabide, Mikel; Atxutegi, Aitor; Estiati, Idoia; Olazar, Martı́n; Freire, José Teixeira

doi:10.1021/acs.iecr.3c00585

Cited by 3 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…de Brito et al have reported that intermittent drying represents a promising alternative to conventional drying methods, offering advantages related to energy efficiency and improved product quality. Consequently, this study aims to present a comprehensive predictive model for intermittent drying in conical spouted bed dryers.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive CFD-TFM Simulation of Drying in Spouted Beds with Draft Tubes

Naghdi,

Arabi,

Molaei Dehkordi

2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In this article, simulation runs were conducted to predict the drying evolution of sand in conical spouted beds with a nonporous draft tube using the Eulerian−Eulerian approach. The simulation results were validated against experimental data reported in the literature, and good agreement was achieved. In addition, the effects of various operating and design parameters, such as superficial gas velocity, inlet air temperature, the draft tube's length and diameter, and the solid phase's initial moisture content on the sand drying, were carefully investigated. It was found that the operating temperature and superficial gas velocity are the most essential parameters for improving the drying process and reducing the drying time of the sand particles. In addition, the choice of drag model, restitution coefficient, and specularity coefficient were found to have no significant influence on the drying time of the solid phase. Moreover, increasing the particles' diameter and initial moisture content leads to longer drying times, whereas increasing the conical bed angle prolongs the drying time for the solid particles. On the other hand, increasing the nozzle diameter and entrance length decreases the drying time of the solid phase. Furthermore, reducing the diameter and length of the draft tube also decreased the drying time.

show abstract

Section: Introductionmentioning

confidence: 99%

Comprehensive CFD-TFM Simulation of Drying in Spouted Beds with Draft Tubes

Naghdi,

Arabi,

Molaei Dehkordi

2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Continuum approaches typically represent the drying medium and granular solids as a dilute (i.e., bubble) phase, an interstitial gas phase, and a solids phase. Heat and mass transfer between phases is modeled using correlations to determine hydrodynamic parameters in a spouted bed. , The modeling of intermittent drying is also reported . Other conventional modeling approaches found in the literature include the population balance model (PBM), , neural network, and pore network model .…”

Section: Introductionmentioning

confidence: 99%

Novel CFD-DEM Model for Spouted Bed Drying Incorporating Intraparticle Heat and Mass Diffusion

Che

Wang

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In the final phase of particle drying in a spouted bed, the drying rate is governed by intraparticle heat and mass diffusion. Coupled computational fluid dynamics and the discrete element method (CFD-DEM) have proven to be suitable tools for modeling gas–solid in a spouted bed. However, existing CFD-DEM models are primarily employed to calculate the interphase heat and mass transfer rates based on an assumption of uniform intraparticle temperature and moisture distributions. Alternatively, some models take into account only the evaporation on the surface of the particles. As a result, these models may not reasonably represent the final phase of particle drying. This study introduces a novel CFD-DEM model for spouted bed drying that incorporates intraparticle heat and mass diffusion. The model combines the CFD-DEM governing equations with two one-dimensional intraparticle heat and mass diffusion equations. Benchmark cases using a spouted bed are presented to demonstrate the feasibility of the proposed model. The results indicate that the CFD-DEM model effectively reproduces the rational heat and mass transfer laws of the spouted bed particle drying process characterized by an overall decline in transfer rates. Furthermore, the model provides valuable insights into the temperature and moisture distributions within the particles. The proposed model exhibits great potential for extension to real-world industrial applications, encompassing complex heat and mass diffusion phenomena as well as coupling characteristics.

show abstract

“…It is also important to highlight that spouted bed drying is a field that still deserves being further explored. Recent studies have developed new technologies for spouted bed drying, such as the introduction of internal bed devices as the fountain confiner (Sukunza et al, 2023;Sukunza et al, 2024), mechanical stirrer (Pinto et al, 2023), and applied different drying techniques such as the intermittent drying (de Brito et al, 2023).…”

mentioning

confidence: 99%

Drying acerola residue in a spouted bed: Fluid dynamic study and functional quality analysis

Braga,

de Lima Santos,

Bicalho

et al. 2024

J Food Process Engineering

View full text Add to dashboard Cite

In the fruit processing industry, a large volume of residue is generated, which is usually discarded. However, fruit residues may have appeal as functional ingredients due to the presence of bioactive compound. In this study, the drying of acerola residue in a medium‐sized conventional spouted bed was investigated. The residue was characterized; vitamin C and 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) were determined to evaluate the effect of drying on bioactive compounds. To overcome the difficulty of material fluidization, a mixture composed of in natura acerola residue and acerola residue previously dried in an oven as an inert material was used. The effect of air temperature (40 and 60°C) and velocity (28 and 36 m/s) and amount of in natura residue in the mixture (20% and 30%) was evaluated during drying. As expected, higher temperatures and air velocities and lower percentages of in natura residue favored the reduction of moisture. For a mixture containing 20% in natura residue, air velocity of 36 m/s, and temperature of 60°C, it was possible to achieve a final moisture content suitable for storage (14.23% w.b.) and the highest percentage of DPPH free radical capture activity (85.31%). Moreover, a mixture containing 30% in natura residue, velocity of 28 m/s, and temperature of 40°C conserved more vitamin C (48.30 mg of ascorbic acid/100 g). Finally, spouted bed can be considered a good technique for drying acerola residue as it was able to reduce a high amount of moisture content preserving bioactive compounds during short drying periods at low temperatures.Practical ApplicationsThe acerola processing generates a residue that consists basically of the seeds, bagasse, and peels, which is rich in ascorbic acid, phenolic compounds, flavonoids, anthocyanins, and organic acids. This residue can be used to generate new food products, which reduces the environmental problem of its disposal and the loss of raw material in fruit processing. To extend the residue shelf life, it must be subjected to a drying process. In this paper, the drying of acerola residue was investigated in a medium‐sized spouted bed. The spouted bed proved effectiveness in drying the acerola residue and in conserving bioactive compounds when operating for short periods and with low temperature. Thus, it can be considered as a promising technique for drying food products. Also, the data provided in this study can contribute to the solution of the scale‐up problem in spouted beds.

show abstract

Intermittent Drying of Soybeans in Conical Spouted Beds: Modeling Approach

Cited by 3 publications

References 30 publications

Comprehensive CFD-TFM Simulation of Drying in Spouted Beds with Draft Tubes

Comprehensive CFD-TFM Simulation of Drying in Spouted Beds with Draft Tubes

Novel CFD-DEM Model for Spouted Bed Drying Incorporating Intraparticle Heat and Mass Diffusion

Drying acerola residue in a spouted bed: Fluid dynamic study and functional quality analysis

Contact Info

Product

Resources

About