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Guo J, Liu Y, Shan G, Li H, Li W, Qin H, Xia J, Wu J, Zhang J. The structure-effect relationship between inline high shear mixers and micromixing: Experiment and CFD simulation. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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Multiscale Wavelet Analysis of 3D Lagrangian Trajectories in a Mechanically Agitated Vessel. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Towards a Standard Method for Estimating Fragmentation Rates in Emulsification Experiments. Processes (Basel) 2021. [DOI: 10.3390/pr9122242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The fragmentation rate function connects the fundamental drop breakup process with the resulting drop size distribution and is central to understanding or modeling emulsification processes. There is a large interest in being able to reliably measure it from an emulsification experiment, both for generating data for validating theoretical fragmentation rate function suggestions and as a tool for studying emulsification processes. Consequently, several methods have been suggested for measuring fragmentation rates based on emulsion experiments. Typically, each study suggests a new method that is rarely used again. The lack of an agreement on a standard method has become a substantial challenge. This contribution critically and systematically analyses four influential suggestions of how to measure fragmentation rate in terms of validity, reliability, and sensitivity to method assumptions. The back-calculation method is identified as the most promising—high reliability and low sensitivity to assumption—whereas performing a non-linear regression on a parameterized model (as commonly suggested) is unsuitable due to its high sensitivity. The simplistic zero-order method is identified as an interesting supplemental tool that could be used for qualitative comparisons but not for quantification.
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Analysis of the Dispersion of Viscoelastic Clusters in the Industrial Rotor-Stator Equipment. Processes (Basel) 2021. [DOI: 10.3390/pr9122232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Materials with complex rheology and viscoelasticity may require special equipment for processing, such as for dispergation. Rheological and mechanical data of the material can help with finding the required equipment or designing equipment. For highly viscous and complex material, a rotor-stator mixer can be a good choice for dispergation. Due to the laminar or creeping mechanism of flow inside the equipment, the dispergation mechanism is assumed to be a combination of the shear stress and slicing of the material by the rotor and stator blades. For the validation of the theory, the mechanical properties of the viscose identified in a previous work were used for comparison with the data from the CFD simulation of the rotor-stator mixer. The comparison showed that the rotor-stator device can overcome the complex shear modulus and ultimate strength of the material and homogenize the solution through a combination of the shear stress and slicing. The theory was also confirmed on the process line proposed for homogenization of the specific material. The stability of viscosity during the process of homogenization was measured and used as the main parameter for quality assessment.
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Kwon C, Pak US, Kim CM, Paek CH. CFD analysis of flow field and power consumption of in-line high shear mixers with different stator structures. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Effect of structural parameters on the flow field and power consumption of in-line high shear mixer. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Vashisth V, Nigam K, Kumar V. Design and development of high shear mixers: Fundamentals, applications and recent progress. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116296] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wang G, Yang F, Wu K, Ma Y, Peng C, Liu T, Wang LP. Estimation of the dissipation rate of turbulent kinetic energy: A review. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116133] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Espinoza C, Alberini F, Mihailova O, Kowalski A, Simmons M. Flow, turbulence and potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer. CHEMICAL ENGINEERING SCIENCE: X 2020. [DOI: 10.1016/j.cesx.2020.100055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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La Forgia N, Herø EH, Solsvik J, Jakobsen HA. Dissipation rate estimation in a rectangular shaped test section with periodic structure at the walls. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2018.11.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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A validation of commonly used CFD methods applied to rotor stator mixers using PIV measurements of fluid velocity and turbulence. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2017.11.037] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Håkansson A. An experimental investigation of the probability distribution of turbulent fragmenting stresses in a high-pressure homogenizer. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2017.11.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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