The Use of Optimized Restitution Coefficients to Improve Residence Time Prediction in Computational Fluid Dynamics-Discrete Parcel Method Models for Counter-Current Spray Dryers

Hernández, Borja; Francia, Victor; Crosby, Mark Jonathan; Ahmadian, Hossein; Gupta, Prashant; Juan, Luis Martín de; Martı́n, Mariano

doi:10.1021/acs.iecr.1c02415

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Therefore, in this study, small particles are carried by the main fluid, water, in the Kenics static mixers. Some scholars , used DPM to calculate the average residence time of the gas–solid system. In this study, the particle was introduced as a virtual tracer, and the discrete phase model in Fluent 2020R2 was adopted to calculate the residence time of fluid passing through a single mixing component.…”

Section: Resultsmentioning

confidence: 99%

Numerical Investigation of Mass Transfer Prediction in Various Sizes of Kenics Static Mixers on Extraction: Corrected with Eddy Cell Model and Droplet Size Effect Model

Zhou,

Yang,

Cao

et al. 2024

Ind. Eng. Chem. Res.

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The Kenics static mixer is expected to enhance the extraction performance to reduce the burden of the extraction column in the phenolic wastewater treatment process. Currently, it has been deployed as a pre-extractor in a newly built project of 35 m 3 /h wastewater treatment in Datang coal gasification corporation. The fluctuating flow rate brings instability of the extraction performance. However, few studies have paid attention to the mass transfer performance in demo-or commercial-sized static mixers. Thus, this work adopted a three-dimensional model coupled with the CFD-PBE model, the interphase mass transfer model, and the interface mass transfer−droplet size effect function in the simulation of various sizes of Kenics static mixers to describe the droplet size distribution and mass transfer performance. Besides, to increase the accuracy of extraction performance prediction, the eddy cell model and droplet size effect model were introduced to correct the mass transfer performance and droplet size distribution prediction with the change of equipment size and operation flowing velocity. In the simulations, it was found that the greater static mixer size can achieve better mass transfer performance with fewer mixing elements but translated into a lower time efficiency. It was also found that each size Kenics static mixer featured an optimal total flowing velocity, achieving the maximum extraction efficiency in catechol extraction. The extraction efficiencies peaked at total flowing velocities of 0.8, 1.1, 1.2, and 1.2 m/s, with diameters of 30, 100, 200, and 300 mm, respectively. The characteristics of the change in turbulence dissipation rate, turbulent viscosity, and interfacial tension are key factors in the explanation of these phenomena. In each size static mixer, under the respective optimal flowing velocity, the mass fraction of catechol in the aqueous phase meets the criterion of biochemical treatment process influent after continuous two-stage extraction.

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Section: Resultsmentioning

confidence: 99%

Numerical Investigation of Mass Transfer Prediction in Various Sizes of Kenics Static Mixers on Extraction: Corrected with Eddy Cell Model and Droplet Size Effect Model

Zhou,

Yang,

Cao

et al. 2024

Ind. Eng. Chem. Res.

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“…Nonetheless, for higher inlet drying air temperatures, there is a considerable rise in investment and operating costs. Indeed, this rise would be even larger if the system required a temperature higher than 600 o F. Furthermore, the type of product collection equipment used in the spray dryer may significantly influence the cost of spray dryer installations [161]. For instance, a single bank of high-efficiency cyclone collectors without secondary collectors can be a better choice [86,87].…”

Section: The Economics Of Spray Dryingmentioning

confidence: 99%

A Brief Overview of Spray Drying Technology and Its Potential in Food Applications

Kumoro,

Wardhani,

Kusworo

et al. 2024

J. Hum. Earth Future

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Spray drying is one of the most preferred preservation methods that converts an aqueous feed containing solvent, carrier agent, and food compounds into dry powder with superb physicochemical and functional properties. This paper reviews the fundamental and important operating parameters, product characteristics, current and potential applications, and techno-economic aspects of spray drying. The key operating parameters should be chosen to achieve the highest spray drying performance in terms of operational efficiency and product quality. A successful spray drying operation is greatly dependent on the feed material properties, the mechanical design of the equipment, and selected operating parameters. This paper also found that water content, water activity, and glass transition temperature are the main parameters that really determine product quality in terms of shelf life and storage conditions of food powder obtained from the spray drying process. Recent advances in the development of new heatless spray drying technology in the manufacture of food flavoring and nutraceuticals are interesting to develop, in addition to the potential to produce nano-sized powders with distinctive properties and the use of superheated steam and carbon dioxide to sterilize products. The appropriate information on spray drying technology featured in this paper is targeted to reinforce researcher and practitioner understanding for widening its applications in pertinent food industries. Doi: 10.28991/HEF-2024-05-02-09 Full Text: PDF

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Generation of a surrogate compartment model for counter-current spray dryer. Fluxes and momentum modeling

Hernández

Pinto

Martı́n

2022

Computers & Chemical Engineering

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The Use of Optimized Restitution Coefficients to Improve Residence Time Prediction in Computational Fluid Dynamics-Discrete Parcel Method Models for Counter-Current Spray Dryers

Cited by 3 publications

References 45 publications

Numerical Investigation of Mass Transfer Prediction in Various Sizes of Kenics Static Mixers on Extraction: Corrected with Eddy Cell Model and Droplet Size Effect Model

Numerical Investigation of Mass Transfer Prediction in Various Sizes of Kenics Static Mixers on Extraction: Corrected with Eddy Cell Model and Droplet Size Effect Model

A Brief Overview of Spray Drying Technology and Its Potential in Food Applications

Generation of a surrogate compartment model for counter-current spray dryer. Fluxes and momentum modeling

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