Special Issue "Advances in the Chemical Mixing Process"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Chemical Systems".

Deadline for manuscript submissions: 20 February 2021.

Special Issue Editors

Prof. Dr. Václav Uruba
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Guest Editor
Institute of Thermomechanics of the Czech Academy of Sciences, Dolejškova 5, 182 00 Praha 8, Czech Republic. Department of Power System Engineering, University of West Bohemia, Univerzitní 22, 306 14 Plzeň , Czech Republic.
Interests: Fluid Mechanics, Turbulence, experimental techniques in FM
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Prof. Dr. Witold Elsner
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Guest Editor
Head of the Department, Department of Thermal Machinery, Faculty of Mechanical and Computer Engineering, Czestochowa University of Technology, 42-201 Częstochowa, al. Armii Krajowej 21, Poland
Interests: Prof. Witold Elsner is a professor of fluid mechanics and fluid-flow machinery. His fields of expertise are: unsteady aerodynamics of turbomachinery, boundary layers, transitional flows, experimental analysis of turbulent flows, CFD modeling (RANS and LES), modeling and optimization of thermal cycles, combustion and pyrolitic gasification of biomass, municipal waste and sewage, diagnostics of rotating machinery. Prof. W. Elsner teaches fluid flow machinery, energy conversion technologies, machine maintenance and diagnostics

Special Issue Information

Dear Colleagues,

Nowadays, intensification of chemical processes is a rapidly growing research field, bringing better, simpler, and ultimately cheaper technological means. This could include reduction of the number of devices in the whole system and/or improving heat and mass transfer by advanced mixing technologies, which enables shorter diffusion pathways. Novel approaches enable miniaturization and integrated optimization and control strategies. Those achievements could not be possible without addressing the mixing process itself, as it is involved in several levels of the process.

The mixing process can be subdivided into a cascade of macromixing, mesomixing, and micromixing subprocesses, respectively, in order to more easily address the effects on different spatial scales. These mechanisms are still subjected to intensive research.

Studies clarifying the mixing process itself are welcome, as a better understanding of the physics behind this process enables proper modification of the procedures and choice of the optimal strategy in a given case. Single-phase blending of liquids with component properties that are close to each other is taken into account as a basic case; however, combination of substances with different physical properties could be of great practical interest, including multiphase cases. Practical cases could differ in physical properties of the mixing medium. Detailed knowledge on the physics of the mixing process will be a good starting point for the design of new mixing optimization and control strategies.

The topics could include, but are not limited to, the following:

  • Macro- and micromixing interactions;
  • The role of turbulence in mixing process (physical mechanisms);
  • Mixing intensification strategies (time, space, and energy aspects);
  • Interactions of the mixing process with other processes (heat transfer, chemical process); and
  • Mixing process modeling, simulation, and control applications.

Prof. Dr. Václav Uruba
Prof. Dr. Witold Elsner
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Please note that for papers submitted after 31 December 2020 an APC of 2000 CHF applies. 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

  • chemical process intensification
  • chemical reactor
  • mixing
  • mixing length scales
  • Batchelor scale
  • Kolmogorov scale
  • micromixing
  • macromixing
  • turbulence
  • diffusion

Published Papers (2 papers)

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Research

Open AccessFeature PaperArticle
Analysis of Power Input of an In-Line Rotor-Stator Mixer for Viscoplastic Fluids
Processes 2020, 8(8), 916; https://doi.org/10.3390/pr8080916 - 01 Aug 2020
Abstract
In this work, the power draw and shear profile of a novel in-line rotor-stator mixer were studied experimentally and the laminar flow regime was simulated. The power draw of the rotor-stator mixer was investigated experimentally using viscoplastic shear-thinning fluid and the results of [...] Read more.
In this work, the power draw and shear profile of a novel in-line rotor-stator mixer were studied experimentally and the laminar flow regime was simulated. The power draw of the rotor-stator mixer was investigated experimentally using viscoplastic shear-thinning fluid and the results of the obtained power consumptions were verified through simulations. The power draw constant and Otto-Metzner coefficient were determined from the result of experimental data and through simulations. A new method is suggested for the determination of the Otto-Metzner coefficient for the Herschel–Bulkley model and the term efficiency is introduced. It was shown that the proposed method can be applied successfully for the prediction of the Otto-Metzner coefficient for the mixing of viscoplastic shear-thinning fluids. The effect of geometry and rotor speed on power consumption and shear rate profile in the investigated mixer is discussed from the results of the simulations. It was found that numerical methods are a convenient tool and can predict the power draw of the in-line rotor-stator mixer successfully. Full article
(This article belongs to the Special Issue Advances in the Chemical Mixing Process)
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Open AccessFeature PaperArticle
Scale-Up of Mixing Equipment for Suspensions
Processes 2020, 8(8), 909; https://doi.org/10.3390/pr8080909 - 01 Aug 2020
Abstract
This paper deals with the scale-up of equipment for the mixing of suspensions. The measurement of just-suspended agitator speeds was carried out with standard, pitched, four-blade turbines and folded, four-blade turbines in three vessels (290 mm, 600 mm, and 800 mm in diameter) [...] Read more.
This paper deals with the scale-up of equipment for the mixing of suspensions. The measurement of just-suspended agitator speeds was carried out with standard, pitched, four-blade turbines and folded, four-blade turbines in three vessels (290 mm, 600 mm, and 800 mm in diameter) for several particle sizes and concentrations. The results of measurements confirmed that scale-up based on dimensionless Froude number dependence, on the relative particle size and concentration, can be used. On the basis of the results, a scale-up rule for agitator speeds in a given suspension and equipment geometry was recommended, and various conclusions reported by different investigators were discussed. Full article
(This article belongs to the Special Issue Advances in the Chemical Mixing Process)
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