Studying particle attrition in a solid-liquid agitated vessel using focused beam reflectance measurement (FBRM)

Ravisankar, V.; Wu, Jie; Bhargava, Suresh K.; Parthasarathy, Rajarathinam

doi:10.1016/j.cep.2022.109256

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…For example, in mineral and chemical process industries, the use of baffles may increase particle wear, leading to a decrease in product quality. 3 In bioreactors, the addition of baffles can damage cells that are sensitive to shear. 4 Furthermore, particle accumulation, scaling, and sedimentation may occur at the baffle locations.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Jiao,

Zhang,

Gao

et al. 2024

Ind. Eng. Chem. Res.

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The interaction between the gas–liquid interface and suspended solid particles is an interesting scientific topic and could be studied effectively through the coupled method of discrete element method (DEM) and volume of fluid (VOF) since VOF could capture the evolution of the interface and DEM could describe the particle behaviors very well. In this work, the effects of the particle suspension on the surface vortex in unbaffled stirred tanks are investigated through DEM–VOF in order to reduce the surface vortex and sustain the stability while ensuring effective particle suspension, as the free-surface vortex leads to poor mixing and poor stability in unbaffled stirred tanks. The results show that suspended particles aid in diminishing the surface vortex scale by lessening the turbulence kinetic energy and the radial gradient of fluid velocity. In previous studies, the impeller clearance has almost no effects on the surface vortex in particle-free stirred tanks. However, when there are particles in the tank, it is disclosed in this study that the surface vortex reduces in size along with the decreasing impeller clearance.

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Section: Introductionmentioning

confidence: 99%

“…However, baffles can have adverse effects. For example, in mineral and chemical process industries, the use of baffles may increase particle wear, leading to a decrease in product quality . In bioreactors, the addition of baffles can damage cells that are sensitive to shear .…”

Section: Introductionmentioning

confidence: 99%

Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Jiao,

Zhang,

Gao

et al. 2024

Ind. Eng. Chem. Res.

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“…This problem is further intensified by attempts to shorten the extraction time using stirred tank reactors. Although the processing time may be greatly reduced in this way, the shear force‐induced abrasion impacts of the stirring blades generate undefined fine particles that further increase the width of the previously mentioned range (Ravisankar et al, 2023). Furthermore, cold brew coffee is typically stronger than conventional filter coffee and exhibits a higher brew ratio (coffee mass to water volume).…”

Section: Introductionmentioning

confidence: 99%

Ultrafast extraction of cold brew coffee in a planetary rotating bed reactor: A kinetic study on the pushback effect

von Heynitz,

Ohlmann,

Schmieder

et al. 2023

J Food Process Engineering

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Given the rising demand for cold brew coffee, innovative approaches are required to address the present difficulties in its production. This motivates the consideration of the planetary rotating bed reactor (PRBR) as a solid–liquid extraction technology. The PRBR consists of cylindrical mesh chambers that contain the solid phase and move in two superimposed rotations. This motion pattern enhances mass transfer through alternating radial forces: the pushback effect (PBE). To evaluate the utility of the PRBR and the role of PBE, we investigated the kinetics and energy demand of cold brew coffee extraction. For this purpose, we varied rotational speeds and PBE conditions in a 1 L lab‐scale reactor. Kinetics was determined by in‐line monitoring of electrical conductivity correlated with the eluate's weight‐based total dissolved solids and caffeine by high‐performance liquid chromatography. Energy consumption was derived from strain gauge torque measurements. Our findings reveal that saturation of the extraction rate with respect to the rotational speed is evident both with and without PBE. However, PBE significantly reduces extraction time by 75% while requiring 60% less mechanical energy. The fastest conditions probed 95% of the maximum extraction yield within 12 s, effectively being >99% faster than static immersion. We believe these findings, along with further procedural advantages, qualify the PRBR as a viable technology for cold brew coffee production.Practical ApplicationsThe relevance of an economical and sustainable preparation of cold brew coffee extends from the industrial to the gastronomic to the domestic environment. Challenges and limitations relate to process time, particle separation, product and extraction yield, and taste problems due to over‐extraction. The planetary rotating bed reactor (PRBR) promises to address all these issues by combining extraction and separation in a simultaneous and ultrafast process. The present study confirms the superiority of PRBR's action mechanisms in terms of rapidity and energetic efficiency for extraction. Due to the excellent scalability of both the design and the physical effect, the PRBR is intended for large‐scale production of ready‐to‐drink products and local production in coffee shops or private households. By modifying the particle feed, even continuous operation is conceivable. Further applications are, for example, dry‐hopping of beer, fast‐aging of spirits, and preparation of various liquid foods.

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Carbon dioxide stripping from acidic wastewater through a vortex venturi tubular microbubble generator

Ding,

Chen,

et al. 2024

Journal of Environmental Chemical Engineering

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Studying particle attrition in a solid-liquid agitated vessel using focused beam reflectance measurement (FBRM)

Cited by 3 publications

References 37 publications

Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Effects of Particle Suspension on Surface Vortex in Unbaffled Stirred Tanks through DEM–VOF

Ultrafast extraction of cold brew coffee in a planetary rotating bed reactor: A kinetic study on the pushback effect

Carbon dioxide stripping from acidic wastewater through a vortex venturi tubular microbubble generator

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