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Journal articles on the topic 'Mixing Intensification'

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Author: Grafiati

Published: 6 September 2023

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1

Gaynullina, L. R., and V. P. Tutubalina. "Mixing intensification." IOP Conference Series: Earth and Environmental Science 288 (July 25, 2019): 012086. http://dx.doi.org/10.1088/1755-1315/288/1/012086.

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2

Wu, Jie, L. J. Graham, and N. Noui-Mehidi. "Intensification of Mixing." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 40, no. 11 (2007): 890–95. http://dx.doi.org/10.1252/jcej.06we254.

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3

Keil, Frerich J. "Process intensification." Reviews in Chemical Engineering 34, no. 2 (February 23, 2018): 135–200. http://dx.doi.org/10.1515/revce-2017-0085.

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Abstract Process intensification (PI) is a rapidly growing field of research and industrial development that has already created many innovations in chemical process industry. PI is directed toward substantially smaller, cleaner, more energy-efficient technology. Furthermore, PI aims at safer and sustainable technological developments. Its tools are reduction of the number of devices (integration of several functionalities in one apparatus), improving heat and mass transfer by advanced mixing technologies and shorter diffusion pathways, miniaturization, novel energy techniques, new separation approaches, integrated optimization and control strategies. This review discusses many of the recent developments in PI. Starting from fundamental definitions, microfluidic technology, mixing, modern distillation techniques, membrane separation, continuous chromatography, and application of gravitational, electric, and magnetic fields will be described.

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4

Ohmura, Naoto, Hayato Masuda, and Steven Wang. "Intensification of Mixing Processes with Complex Fluids." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 51, no. 2 (2018): 129–35. http://dx.doi.org/10.1252/jcej.17we149.

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5

Guo, Kai, Botan Liu, Qi Li, and Chunjiang Liu. "Novel optimization approach to mixing process intensification." Transactions of Tianjin University 21, no. 1 (January 2015): 1–10. http://dx.doi.org/10.1007/s12209-015-2434-8.

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6

Lebedev, Anatoly, Badma Salaev, Baatr Bolaev, Jury Arylov, Pavel Lebedev, and Nikolai Rybalkin. "INTENSIFICATION OF THE PROCESS OF MIXING FEED MIXTURES." SCIENCE IN THE CENTRAL RUSSIA, no. 6 (December 26, 2022): 50–59. http://dx.doi.org/10.35887/2305-2538-2022-6-50-59.

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The quality and reliability of the technological process of preparing feed mixtures has a significant role both on the properties of the manufactured product and on the productivity of animals. The use of standard mixer designs, as a rule, does not ensure the quality of mixtures, economy, efficiency and leads to an increase in energy costs for the implementation of the technological process. Despite the presence of a wide variety in mixer designs, the need for new mixer developments remains an urgent problem associated with the constant increase in requirements for the uniformity of feed mixtures. When preparing combined feeds of own production, the degree of uniformity should be 90...95%. The study of the mixing process was carried out for a two-shaft bladed mixer of continuous operation. During the research, three variants of the operation of the paddle mixer were considered, differing from each other in the number and size of the blades. The greatest intensity of mixing was in a mixer with smaller blades, but at the same time the segregation period was more than 50%. In all variants, 30...50% of the time is spent on convective mixing. High-quality mixing will be ensured by increasing the number of force impacts of the blades in the elementary mixing zones, which determine the total length of the continuous mixer. A new theoretical dependence of the mixing kinetics in a continuous-action paddle mixer is obtained. The formula shows that increasing the uniformity of the finished feed mixture can be achieved by controlling the mixing process and improving the working bodies of mixers. The efficiency of the mixing process is ensured first by creating a preliminary value of the homogeneity of the mixture Θ0, outside the mixing chamber, and then by varying the mixer parameters to ensure the required quality of the feed mixture. The obtained dependence is the basis for a new method of gravitational mixing and a device for its implementation.

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Ivanov, M. V., and B. S. Ksenofontov. "Intensification of Chemical Agents Mixing by Vibroacoustical Agitation." Ecology and Industry of Russia 21, no. 9 (January 1, 2017): 4–9. http://dx.doi.org/10.18412/1816-0395-2017-9-4-9.

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8

Tamminen, Jussi, Tuomo Sainio, and Erkki Paatero. "Intensification of metal extraction with high-shear mixing." Chemical Engineering and Processing: Process Intensification 73 (November 2013): 119–28. http://dx.doi.org/10.1016/j.cep.2013.08.005.

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9

Ahoure, Louis, Odin Bulliard-Sauret, Christophe Andre, Julie Bergraser, Marion Gaudeau, and S. Amir Bahrani. "Intensification of mixing in an ultrasonic flow reactor." Chemical Engineering and Processing - Process Intensification 183 (January 2023): 109212. http://dx.doi.org/10.1016/j.cep.2022.109212.

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10

Li, Zhen, Chengqian Zhao, Huaiqing Zhang, Jiongtian Liu, Chao Yang, and Shanxin Xiong. "Process intensification of stirred pulp-mixing in flotation." Chemical Engineering and Processing - Process Intensification 138 (April 2019): 55–64. http://dx.doi.org/10.1016/j.cep.2019.03.008.

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11

Rozoff, Christopher M., James P. Kossin, Wayne H. Schubert, and Pedro J. Mulero. "Internal Control of Hurricane Intensity Variability: The Dual Nature of Potential Vorticity Mixing." Journal of the Atmospheric Sciences 66, no. 1 (January 1, 2009): 133–47. http://dx.doi.org/10.1175/2008jas2717.1.

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Abstract In hurricane eyewalls, the vertical stretching effect tends to produce an annular ring of high vorticity. Idealized, unforced nondivergent barotropic model results have suggested such rings of vorticity are often barotropically unstable, leading to strong asymmetric mixing events where vorticity is mixed inward into a more stable configuration. Such mixing events most often result in weakened maximum winds. The manner in which forcing modifies these unforced simulations remains an open question. In the current study, a forced, two-dimensional barotropic model is used to systematically study the sensitivity of vorticity rings to ring geometry and spatially and temporally varying forcing. The simulations reveal an internal mechanism that interrupts the intensification process resulting from vorticity generation in the hurricane eyewall. This internal control mechanism is due to vorticity mixing in the region of the eye and eyewall and can manifest itself in two antithetical forms—as a transient “intensification brake” during symmetric intensification or as an enhancer of intensification through efficient transport of vorticity from the eyewall, where it is generated, to the eye.

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12

Ivanets-, Vitaliy, Dmitriy Borodulin-, Andrey Shushpannikov-, and Dmitriy Suhorukov-. "INTENSIFICATION OF BULK MATERIAL MIXING IN NEW DESIGNS OF DRUM, VIBRATORY AND CENTRIFUGAL MIXERS." Foods and Raw Materials 3, no. 1 (July 1, 2015): 62–69. http://dx.doi.org/10.12737/11239.

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13

Zhang, Chuanyu, Philippe Brunet, Laurent Royon, and Xiaofeng Guo. "Mixing intensification using sound-driven micromixer with sharp edges." Chemical Engineering Journal 410 (April 2021): 128252. http://dx.doi.org/10.1016/j.cej.2020.128252.

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14

Jegatheeswaran, Sinthuran, Farhad Ein-Mozaffari, and Jiangning Wu. "Laminar mixing of non-Newtonian fluids in static mixers: process intensification perspective." Reviews in Chemical Engineering 36, no. 3 (April 28, 2020): 423–36. http://dx.doi.org/10.1515/revce-2017-0104.

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AbstractStatic mixers are widely used in various industrial applications to intensify the laminar mixing of non-Newtonian fluids. Non-Newtonian fluids can be categorized into (1) time-independent, (2) time-dependent, and (3) viscoelastic fluids. Computational fluid dynamics studies on the laminar mixing of viscoelastic fluids are very limited due to the complexity in incorporating the multiple relaxation times and the associated stress tensor into the constitutive equations. This review paper provides recommendations for future research studies while summarizing the key research contributions in the field of non-Newtonian fluid mixing using static mixers. This review discusses the different experimental techniques employed such as electrical resistance tomography, magnetic resonance imaging, planar laser-induced fluorescence, and positron emission particle tracking. A comprehensive overview of the mixing fundamentals, fluid chaos, numerical characterization of fluid stretching, development of pressure drop correlations, and derivations of generalized Reynolds number is also provided in this review paper.

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15

da Cunha, Marcio Rodrigues, Antonio Carlos Seabra, and Mário R. Gongora-Rubio. "LTCC 3D MICROMIXER OPTIMIZATION FOR PROCESS INTENSIFICATION." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (September 1, 2012): 000563–72. http://dx.doi.org/10.4071/cicmt-2012-tha13.

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Mixing of fluids is a very important unit operation for Chemical, Biochemical, & Pharmaceutical processes among others, with a great deal of interest for industrial and research sectors. Micromixers a new implementation in micro scale of mixers are being studied. Active (electrokinetic, pressure disturbances, ultrasonic, magneto-hydrodynamic) and passive (jet breakup, vortex, microchannels ) methods appear in the literature. In particular research of micromixers with microchannels having different kind of elbows are conducted focusing hydrodynamic phenomena in microscale, like caotic advection. LTCC Microsystem Technology is suitable for the construction of micromixers because their inherent capacity of implementing 2D and 3D structures. The goal of the present work is to report our current study on LTCC micromixers based on microchannels having different kind of elbows for geometry optimization applying finite element Computational Fluid Dynamic numerical methods for process chemical intensification. The study will contemplate nine different 2D and 3D LTCC micromixer geometries compared with straight channel micromixer and prospect hydrodynamic parameters as: flow rate, pressure difference, friction factor and head loss coefficient. It is also presented a description of flowage as a function of diffusion-convection equation in order to obtain the mixing performance of designed devices.

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16

Sevostyanov, Ivan, and Sergiy Kraevsky. "INTENSIFICATION OF MIXING OF HETEROGENEOUS FOOD MIXTURES UNDER THE IMPACT OF ULTRASONIC VIBRATIONS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 4(111) (December 18, 2020): 80–89. http://dx.doi.org/10.37128/2520-6168-2020-4-9.

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There is known equipment for mixing of heterogeneous food mixtures analyzed in this article. Some part of this equipment provides qualitative mixing at macro-level (mixing of large portions of processed material), for example, paddle, propeller, turbine, anchor, screw, gravitation and drum mixers. Another part of mixing machines on the contrary, allows to achieve of effective micro-level mixing (mutual movements of adjacent particles of material) – vibratory and centrifugal mixers. In some cases there is important to provide well mixing both at macro- and at micro-level, when it is accompanied by thermal, diffusion or chemical processes and from its efficiency depend energy expenses and qualitative characteristics of product. Therefore, a task of elaboration of schemes of improved apparatuses for effective macro- and micro-mixing of dry and liquid multi-component food materials is resolved in the article. Authors are proposing to create these apparatuses at the base of well known equipment – gravitation and screw mixers by way of their additional equipping with serial electromagnetic vibro-exciters of ultrasonic oscillations. As a result, a main drive of a base mixer will provide working process at macro-level and an additional drive – micro-level movements of material particles. The proposed apparatuses have a simple and reliable construction, don’t consist of original parts and at the same time, provide necessary efficiency of working process. Equations of movements of processed components particles in course of their different loading stages, with examination of physical-mechanical properties of the components are also presented in the article. These equations can be used as a base for further creation of methods of design calculation of proposed apparatuses.

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17

Hasanov, A. S., M. S. Ahmedov, T. T. Sirozhov, and B. I. Tolibov. "NEW DIRECTIONS FOR CREATING SLAG GRANULATION TECHNOLOGY COPPER PRODUCTION." EurasianUnionScientists 4, no. 2(71) (2020): 49–55. http://dx.doi.org/10.31618/esu.2413-9335.2020.4.71.600.

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New technological processes of pyrometallurgical depletion of slag solve issues of either intensification or wastelessness. To solve the problems of intensification, melt mixing is used mechanically or by gas. Top tuyere lances are used, as well as sparging with reducing gas in PV type furnaces. Acceptable results were obtained at pilot plants, but non-waste tasks were not solved.

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18

Bedarev, Igor, Valentin Temerbekov, Aleksandr Fedorov, and Kristina Rylova. "Numerical Modeling Of The Ignition Initiation In The Scramjet Combustion Chamber Via Detonation." Siberian Journal of Physics 11, no. 4 (December 1, 2016): 33–44. http://dx.doi.org/10.54362/1818-7919-2016-11-4-33-44.

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The paper studies of the cellular detonation wave interaction with supersonic reacting flow in the scramjet combustion chamber. Comparing the flow fields for the details and the reduced chemical kinetics models is allowed verifying the acceptability of the proposed simplified kinetic scheme. The possibility of using pulsating detonation for the ignition intensification in the scramjet combustion chamber is shown. Calculation of the detonation wave interaction with nonpremixed hydrogenair mixture is made. The ability to influence on the hydrogen-air mixing process by means of detonation tube is detected. The effect of tube sizes to intensification of hydrogen air mixing in the flow at channel with a cavity is calculated.

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19

Okuda, Keita, Yuusuke Sugikawa, and Toshihisa Ueda. "Effect of Periodical Injection for the Intensification of Mixing Process." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 40, no. 11 (2007): 905–12. http://dx.doi.org/10.1252/jcej.07we003.

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20

Zhang, Mengxue, Yinyu Hu, Wentan Wang, Ting Shao, and Yi Cheng. "Intensification of viscous fluid mixing in eccentric stirred tank systems." Chemical Engineering and Processing: Process Intensification 66 (April 2013): 36–43. http://dx.doi.org/10.1016/j.cep.2013.01.006.

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21

Zhang, Fan, Samuel Marre, and Arnaud Erriguible. "Mixing intensification under turbulent conditions in a high pressure microreactor." Chemical Engineering Journal 382 (February 2020): 122859. http://dx.doi.org/10.1016/j.cej.2019.122859.

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22

Zhu, Ping, Bryce Tyner, Jun A. Zhang, Eric Aligo, Sundararaman Gopalakrishnan, Frank D. Marks, Avichal Mehra, and Vijay Tallapragada. "Role of eyewall and rainband eddy forcing in tropical cyclone intensification." Atmospheric Chemistry and Physics 19, no. 22 (November 27, 2019): 14289–310. http://dx.doi.org/10.5194/acp-19-14289-2019.

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Abstract. While turbulence is commonly regarded as a flow feature pertaining to the planetary boundary layer (PBL), intense turbulent mixing generated by cloud processes also exists above the PBL in the eyewall and rainbands of a tropical cyclone (TC). The in-cloud turbulence above the PBL is intimately involved in the development of convective elements in the eyewall and rainbands and consists of a part of asymmetric eddy forcing for the evolution of the primary and secondary circulations of a TC. In this study, we show that the Hurricane Weather Research and Forecasting (HWRF) model, one of the operational models used for TC prediction, is unable to generate appropriate sub-grid-scale (SGS) eddy forcing above the PBL due to a lack of consideration of intense turbulent mixing generated by the eyewall and rainband clouds. Incorporating an in-cloud turbulent-mixing parameterization in the vertical turbulent-mixing scheme notably improves the HWRF model's skills in predicting rapid changes in intensity for several past major hurricanes. While the analyses show that the SGS eddy forcing above the PBL is only about one-fifth of the model-resolved eddy forcing, the simulated TC vortex inner-core structure, secondary overturning circulation, and the model-resolved eddy forcing exhibit a substantial dependence on the parameterized SGS eddy processes. The results highlight the importance of eyewall and rainband SGS eddy forcing to numerical prediction of TC intensification, including rapid intensification at the current resolution of operational models.

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23

Firsov, A. A., A. V. Efimov, N. S. Kolosov, I. A. Moralev, and S. B. Leonov. "Intensification of mixing of fuel with supersonic air flow when injection and electric discharge are combined." Journal of Physics: Conference Series 2100, no. 1 (November 1, 2021): 012007. http://dx.doi.org/10.1088/1742-6596/2100/1/012007.

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Abstract This paper presents the results of experimental investigations of DC discharge influence on mixing intensification of transvers injected gas jet into supersonic aiflow. The air was used as injected gas to prevent the influence of chemical reactions on measurements. The data obtained during discharge includes current and voltage acquisition, registration of pressure pulsations in the jet downstream of discharge operation accompanied by correlation and Fourier analysis allowed to conclude that discharge significantly increase the pressure pulsations in a wide frequency range of 1000 Hz to 50kHz. Increase of the oscillations near the jet boundary is assumed to be related to kinematic mixing intensification of the injected gas with the oncoming flow.

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24

Aret, Valdur, Valdur Aret, Marianna Kremenevskaya, Marianna Kremenevskaya, Aleksey Krupoderov, Aleksey Krupoderov, Olga Sosnina, et al. "Intensification of thermal and rheological processes in a scraped-surface apparatus." Foods and Raw Materials 6, no. 2 (December 20, 2018): 342–49. http://dx.doi.org/10.21603/2308-4057-2018-2-342-349.

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The operation parameters of a special heat exchange scraped-surface apparatus ware studied and mathematically described in the article. The feature of the apparatus was the use of perforated cleaning devices in order to increase the turbulence of a product. The developed device can be used in the dairy, meat, and fat and oil industry to cool cream, animal fats, margarine emulsions, cooking fats, and other viscous food products. The increase in the productivity of the apparatus was achieved as a result of the more intensive mixing of the cleaned wall layers with the bulk of the cooled product due to the presence of cylindrical holes in the slats with a diameter of at least 0.05–0.1 of the diameter of the working cylinder. As a result of processing experimental data on heat exchange taking into account energy dissipation, a calculated criterial heat exchange equation for the nonisothermal motion of products and their different flows – laminar and transient – was obtained explicitly. In addition, the article considers the effect of starting modes on the operation of apparatus with mixing devices. These data can make it possible to take into account the possible deviations of parameters caused by nonsteady operating modes. On the basis of the data obtained, we have proposed assumptions about the degree of impact of viscosity and inertia in the considered range of parameters on a starting mode. The results of the study are relevant since they allow us to intensify the thermal processes in this type of common apparatus by 10–12%.

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25

Galushkin, M. G., E. B. Gordon, M. S. Drozdov, and K. A. Sviridov. "Chemical Intensification of Nonlinear Multi-Wave Interactions." Laser Chemistry 12, no. 3-4 (January 1, 1992): 199–209. http://dx.doi.org/10.1155/lc.12.199.

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Nonlinear interaction of laser emission with a chemically reactive medium, in which a branched chain reaction may readily occur, has been analyzed aiming at essential intensification the contrast of photochemically induced phase gratings. For the model system CS2/O2, the degenerated four-wave mixing is theoretically studied under the assumption of CS2 photodissociation followed by subsequent secondary reactions induced by reactive photodissociation products. For varied CS2 concentrations and incident flux intensities, the dynamics of nonlinear reflection has been analyzed and same laser applications of such systems are suggested.

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26

Panferov, Andrey A., Grigory K. Ivakhnyuk, Nikolay F. Fedorov, Tazhir E. Mametnabiev, and Andrey S. Drinberg. "ELECTROPHYSICAL INTENSIFICATION AND SIMULATION OF GRINDING AND MIXING OF INORGANIC MATERIALS." Bulletin of the Saint Petersburg State Institute of Technology (Technical University) 60 (2022): 18–22. http://dx.doi.org/10.36807/1998-9849-2022-60-86-18-22.

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The working hypothesis previously confirmed at Phosphorit JSC (Kingisepp, Leningrad Region) on the significant effect of static electricity on the efficiency of grinding in cement clinker ball mills was successfully tested at the cement production. The method of electrophysical neutralization of static electricity charges has opened up the possibility not only to increase the productivity of grinders (by 12-18% wt.) or save energy for the electric drive (up to 20% rel.), but also made it possible to obtain homogeneous mixtures of dispersed inorganic powders, for example, a clinker encryption preparation, for example, when clinker is charged with sludge incineration ash. The homogeneity of such mixtures experimentally confirms the validity of the proposed mathematical model of the mixing process. The resulting dry mixtures showed the practical invariability of the mechanical strength of the cement stone based on them. The saving of the main binder-clinker was up to 15 wt. %, thus solving the problem of sludge incineration ash utilization

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27

Ling, Fiona W. M., Ali A. Khleif, and Hayder A. Abdulbari. "Effect of Microstructures in Microchannel for Single Phase Flow Mixing Intensification." IOP Conference Series: Materials Science and Engineering 736 (March 5, 2020): 022032. http://dx.doi.org/10.1088/1757-899x/736/2/022032.

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28

Liu, Zhe, Yanbin Huang, Yong Jin, and Yi Cheng. "Mixing intensification by chaotic advection inside droplets for controlled nanoparticle preparation." Microfluidics and Nanofluidics 9, no. 4-5 (March 20, 2010): 773–86. http://dx.doi.org/10.1007/s10404-010-0593-4.

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29

McLeod, James D., Maazuza Z. Othman, and Rajarathinam Parthasarathy. "Process intensification of anaerobic digestion: Influence on mixing and process performance." Bioresource Technology 274 (February 2019): 533–40. http://dx.doi.org/10.1016/j.biortech.2018.12.011.

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30

Thomas, Leif N., and Craig M. Lee. "Intensification of Ocean Fronts by Down-Front Winds." Journal of Physical Oceanography 35, no. 6 (June 1, 2005): 1086–102. http://dx.doi.org/10.1175/jpo2737.1.

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Abstract Many ocean fronts experience strong local atmospheric forcing by down-front winds, that is, winds blowing in the direction of the frontal jet. An analytic theory and nonhydrostatic numerical simulations are used to demonstrate the mechanism by which down-front winds lead to frontogenesis. When a wind blows down a front, cross-front advection of density by Ekman flow results in a destabilizing wind-driven buoyancy flux (WDBF) equal to the product of the Ekman transport with the surface lateral buoyancy gradient. Destabilization of the water column results in convection that is localized to the front and that has a buoyancy flux that is scaled by the WDBF. Mixing of buoyancy by convection, and Ekman pumping/suction resulting from the cross-front contrast in vertical vorticity of the frontal jet, drive frontogenetic ageostrophic secondary circulations (ASCs). For mixed layers with negative potential vorticity, the most frontogenetic ASCs select a preferred cross-front width and do not translate with the Ekman transport, but instead remain stationary in space. Frontal intensification occurs within several inertial periods and is faster the stronger the wind stress. Vertical circulation is characterized by subduction on the dense side of the front and upwelling along the frontal interface and scales with the Ekman pumping and convective mixing of buoyancy. Cross-front sections of density, potential vorticity, and velocity at the subpolar front of the Japan/East Sea suggest that frontogenesis by down-front winds was active during cold-air outbreaks and could result in strong vertical circulation.

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31

Tsujino, Satoki, and Hung-Chi Kuo. "Potential Vorticity Mixing and Rapid Intensification in the Numerically Simulated Supertyphoon Haiyan (2013)." Journal of the Atmospheric Sciences 77, no. 6 (May 26, 2020): 2067–90. http://dx.doi.org/10.1175/jas-d-19-0219.1.

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Abstract The inner-core dynamics of Supertyphoon Haiyan (2013) undergoing rapid intensification (RI) are studied with a 2-km-resolution cloud-resolving model simulation. The potential vorticity (PV) field in the simulated storm reveals an elliptical and polygonal-shaped eyewall at the low and middle levels during RI onset. The PV budget analysis confirms the importance of PV mixing at this stage, that is, the asymmetric transport of diabatically generated PV to the storm center from the eyewall and the ejection of PV filaments outside the eyewall. We employ a piecewise PV inversion (PPVI) and an omega equation to interpret the model results in balanced dynamics. The omega equation diagnosis suggests eye dynamical warming is associated with the PV mixing. The PPVI indicates that PV mixing accounts for about 50% of the central pressure fall during RI onset. The decrease of central pressure enhances the boundary layer (BL) inflow. The BL inflow leads to contraction of the radius of the maximum tangential wind (RMW) and the formation of a symmetric convective PV tower inside the RMW. The eye in the later stage of the RI is warmed by the subsidence associated with the convective PV towers. The results suggest that the pressure change associated with PV mixing, the increase of the symmetric BL radial inflow, and the development of a symmetric convective PV tower are the essential collaborating dynamics for RI. An experiment with 500-m resolution shows that the convergence of BL inflow can lead to an updraft magnitude of 20 m s−1 and to a convective PV tower with a peak value of 200 PVU (1 PVU = 10−6 K kg−1 m2 s−1).

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32

Мудров and Aleksandr Mudrov. "THE NEW GROUP OF SPATIAL STIRRED MACHINES." Vestnik of Kazan State Agrarian University 11, no. 2 (July 5, 2016): 77–82. http://dx.doi.org/10.12737/20641.

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The four ways to intensify the mixing process was proposed and developed, implemented in devices with a stirrer according to the type of working units movement: the operating shaft moves with intracyclic angular velocity, the shaft performs a complex spatial movement, the working units was made in the form of 3,4 and 5 mobile units, with two and more working shafts with different motion laws. Nine new classification groups of devices with a stirrer with a lot of variants in each group were created. The devices have a high degree of intensification of mixing liquid and hard-mixing agricultural materials.

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33

Pun, Iam-Fei, Johnny Chan, I. I. Lin, Kelvin Chan, James Price, Dong Ko, Chun-Chi Lien, Yu-Lun Wu, and Hsiao-Ching Huang. "Rapid Intensification of Typhoon Hato (2017) over Shallow Water." Sustainability 11, no. 13 (July 6, 2019): 3709. http://dx.doi.org/10.3390/su11133709.

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On 23 August, 2017, Typhoon Hato rapidly intensified by 10 kt within 3 h just prior to landfall in the city of Macau along the South China coast. Hato’s surface winds in excess of 50 m s−1 devastated the city, causing unprecedented damage and social impact. This study reveals that anomalously warm ocean conditions in the nearshore shallow water (depth < 30 m) likely played a key role in Hato’s fast intensification. In particular, cooling of the sea surface temperature (SST) generated by Hato at the critical landfall point was estimated to be only 0.1–0.5 °C. The results from both a simple ocean mixing scheme and full dynamical ocean model indicate that SST cooling was minimized in the shallow coastal waters due to a lack of cool water at depth. Given the nearly invariant SST in the coastal waters, we estimate a large amount of heat flux, i.e., 1.9k W m−2, during the landfall period. Experiments indicate that in the absence of shallow bathymetry, and thus, if nominal cool water had been available for vertical mixing, the SST cooling would have been enhanced from 0.1 °C to 1.4 °C, and sea to air heat flux reduced by about a quarter. Numerical simulations with an atmospheric model suggest that the intensity of Hato was very sensitive to air-sea heat flux in the coastal region, indicating the critical importance of coastal ocean hydrography.

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34

Ширниех, А. А. "EXPERIMENTAL STUDY ON THE SELECTION OF THE LOAD FOR A COMBIFILTER TO INCREASE THE EFFICIENCY OF THE WASTEWATER TREATMENT PROCESS." Housing and utilities infrastructure, no. 1(24) (March 20, 2023): 105–12. http://dx.doi.org/10.36622/vstu.2023.24.1.012.

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Предложено увеличение эффективности фильтрования за счет использования камеры перемешивания внутри корпуса фильтра с предварительным дозированием коагулянта. Внутри камеры расположено две чаши, в которых протекают две разные стадии коагуляции. В первой чаше происходит перекинетическая коагуляция коллоидов, для протекания которой необходимо перемешивание. Для обеспечения качественного перемешивания была проведена серия опытов для подбора наилучшей перемешивающей загрузки, где определялся оптимальный размер для загрузки, материал и его объем. Перемешивающая загрузка выступает не только в качестве перемешивающих элементов, но и в качестве дополнительной поверхности раздела фаз. Подобранная загрузка позволит обеспечить оптимальные условия для протекания первой ступени коагуляции. The intensification of water purification stages is becoming more and more relevant. The volume of discharge of contaminated wastewater is about 30% of the total volume of discharge, which is carried out by enterprises with various economic activities. Intensification of the filtration process will improve the quality of discharged water due to the prevalence of the use of this stage. This result is possible due to the use of a mixing chamber inside the filter housing with preliminary dosing of the coagulant. Inside the chamber there are two bowls in which two different stages of coagulation take place. In the first bowl, there is a kinetic coagulation of colloids, for which mixing is necessary. To ensure high-quality mixing, a series of experiments was conducted to select the best mixing load, where the optimal size of the load, material and its volume were determined. The mixing load will act not only as mixing elements, but also as an additional phase interface. The selected load will ensure optimal conditions for the flow of the first stage of coagulation.

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35

Zhumadullayev, Daulet Koshkarovich, Alexandr Anatolievich Volnenko, Didar Sarsenbekuly, and Abilda Abdykadyrovich Yeshzhanov. "Intensification of a Heat Exchange Process in Mixing and Surface Heat Exchangers." International Review of Mechanical Engineering (IREME) 12, no. 3 (March 31, 2018): 279. http://dx.doi.org/10.15866/ireme.v12i3.14181.

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36

Sobolev, A. V. "Intensification of mixing by small-size jets in ejectors with central nozzle." Thermophysics and Aeromechanics 20, no. 3 (June 2013): 273–76. http://dx.doi.org/10.1134/s0869864313030025.

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37

Gonzalez-Hidalgo, C. T., J. Herrero, and D. Puigjaner. "Mixing intensification by natural convection with application to a chemical reactor design." Chemical Engineering Journal 200-202 (August 2012): 506–20. http://dx.doi.org/10.1016/j.cej.2012.06.102.

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TOMKINS, C., S. KUMAR, G. ORLICZ, and K. PRESTRIDGE. "An experimental investigation of mixing mechanisms in shock-accelerated flow." Journal of Fluid Mechanics 611 (September 25, 2008): 131–50. http://dx.doi.org/10.1017/s0022112008002723.

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An experimental investigation of mixing mechanisms in a shock-induced instability flow is described. We obtain quantitative two-dimensional maps of the heavy-gas (SF6) concentration using planar laser-induced fluorescence for the case of a shock-accelerated cylinder of heavy gas in air. The instantaneous scalar dissipation rate, or mixing rate, χ, is estimated experimentally for the first time in this type of flow, and used to identify the regions of most intense post-shock mixing and examine the underlying mechanisms. We observe instability growth in certain regions of the flow beginning at intermediate times. The mixing rate results show that while these unstable regions play a significant role in the mixing process, a large amount of mixing also occurs by mechanisms directly associated with the primary instability, including gradient intensification via the large-scale strain field in a particular non-turbulent region of the flow.

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39

Cascaval, Dan, Anca-Irina Galaction, and Elena Folescu. "Optimization of the mixing in stirred bioreactors, 1. Comparative analysis of the mixing efficiency with different radial impellers for simulated broths." Chemical Industry and Chemical Engineering Quarterly 13, no. 1 (2007): 1–20. http://dx.doi.org/10.2298/ciceq0701001c.

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Although radial impellers, especially the Rushton turbine, are widely used in stirred bioreactors, their applicability is limited by the high apparent viscosities of the broth. Beside the intensification of broth circulation, the energetic efficiency and the shear effects on biocatalysts must be taken into account to select the optimum impeller or impellers combination. In this context, the paper presents a comparative study on the efficiency of seven different radial impellers for simulated broth mixing in a stirred bioreactor. The analysis was made by means of the mixing time values obtained by vertically changing the position of the pH-sensor in the broths, in correlation with the energy consumption needed for a certain level of mixing time or for the uniform distribution of the mixing intensity into the bulk volume of the broths.

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40

Wesselhoeft, Kirsten. "The Constraints of Choice: Secular Sensibilities, Pious Critique, and an Islamic Ethic of Sisterhood in France." Sociology of Islam 7, no. 4 (December 13, 2019): 226–44. http://dx.doi.org/10.1163/22131418-00704006.

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Muslim women in France engage with moral language of choice, freedom, and rights in a way that offers a framework for the intensification rather than the dilution of pious aspirations. At the same time, the centrality of choice in French state discourses pertaining to Muslim women over-determines the language of choice, freedom, and rights through association with political secularism. Against the background of the valorization of gender mixing (mixité) in state discourses, all-female Islamic social settings reconfigure gender separation (non-mixité) through a pious ethos of rights, freedoms, and personal development that makes up part of the “assemblage” of secularity in the French context, even as these settings are opposed to political secularism.

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41

Alizadeh Choobari, O., P. Zawar-Reza, and A. Sturman. "Low level jet intensification by mineral dust aerosols." Annales Geophysicae 31, no. 4 (April 5, 2013): 625–32. http://dx.doi.org/10.5194/angeo-31-625-2013.

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Abstract. Modification of the intensity of a low level jet (LLJ) and near-surface wind speed by mineral dust is important as it has implications for dust emission and its long-range transport. Using the Weather Research and Forecasting with Chemistry (WRF/Chem) regional model, it is shown that direct radiative forcing by mineral dust reduces temperature in the lower atmosphere, but increases it in the layers aloft. The surface cooling is shown to be associated with a reduction of turbulent kinetic energy (TKE) and hence vertical mixing of horizontal momentum. Changes in the vertical profile of temperature over the regions that are under the influence of a LLJ are shown to result in an intensification of the LLJ and near-surface wind speed, but a decrease of winds aloft. These changes in the wind speed profile differ from results of previous research which suggested a decrease of wind speed in the lower atmosphere and its increase in the upper boundary layer.

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Slavnov, E. V., V. I. Yankov, and S. I. Urzhuntseva. "Screw Machines with Longitudinal Circulation of Fluid. Communication 3. Intensification of Mixing Processes." Fibre Chemistry 35, no. 5 (September 2003): 384–90. http://dx.doi.org/10.1023/b:fich.0000012198.67774.89.

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Kolenchukov, O. A., E. A. Petrovsky, A. Yu Mikhaylov, K. A. Bashmur, and N. A. Smirnov. "Intensification of heat transfer by mixing in pyrolysis units during oil waste disposal." IOP Conference Series: Materials Science and Engineering 862 (May 28, 2020): 032093. http://dx.doi.org/10.1088/1757-899x/862/3/032093.

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Ustinov, M. V. "Mixing Intensification on the Edge of a Jet by Means of Longitudinal Vortices." Fluid Dynamics 40, no. 6 (November 2005): 897–910. http://dx.doi.org/10.1007/s10697-006-0006-2.

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45

Lazareva, E. V., A. N. Aleshin, and S. G. Zaytsev. "Investigation of the shock-induced evolution of turbulent zone." Laser and Particle Beams 15, no. 1 (March 1997): 83–91. http://dx.doi.org/10.1017/s0263034600010776.

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This study was devoted to the investigation of the shock-induced intensification of the turbulent mixing zone. Our data were compared with those reported by the authors from the United States and France. The experiments were performed in a shock tube of square section filled with the two gases, which were separated with a thin lavsan film. The working gases were helium, argon, krypton, xenon, and their combinations. This allowed us to perform the studies for the Atwood numbers ranging from 0.095 to 0.91 in magnitude. The incident shock wave passed from light to heavy gas and vice versa. The initial pressure of 0.5 atm and Mach number of the incident shock wave 3% were chosen as the working parameters because under these conditions the experimental x, t-diagram coincided with the calculated x, t-diagram within the 3% experimental error. The process was visualized by the Schlieren method with the IAB-451 device using continuous recording or recording in frames. We studied the shock-induced intensification of the turbulent zone, the effect of initial conditions on this intensification, and the influence of the turbulent zone on the intensification of the shock passed through the zone.

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Akhmedov, Azimjon, and Yusuf Azimov. "Intensification of process of hydration of soybean oil with use of ultrasonic impact." E3S Web of Conferences 365 (2023): 04032. http://dx.doi.org/10.1051/e3sconf/202336504032.

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This scientific article presents the results of ultrasound on changes in the yield of phospholipids, lecithin, and cephalin in soybean oil depending on the intensity of the soybean oil hydration process and the consumption of the hydrated solution, conventional mixing, and ultrasound exposure, as well as 20-22 Due to the use of high-frequency ultrasound exposure, the amount of non-hydratable phospholipids in soybean oil was reduced.

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Minakov, Andrey V., Alexander S. Lobasov, Anna A. Shebeleva, and Alexander V. Shebelev. "Analysis of Hydraulic Mixing Efficiency in Widespread Models of Micromixers." Fluids 5, no. 4 (November 18, 2020): 211. http://dx.doi.org/10.3390/fluids5040211.

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In this paper, we present the results of a systematic numerical study of the flow and mixing modes of fluids in micromixers of various configurations, in particular, an analysis of passive micromixers, the most widely used in practice, as well as the main methods to intensify mixing. The advantages of microstructure reactors can significantly reduce reaction times and increase productivity compared to traditional bulk reactors. Four different geometries of micromixers, including the straight T-shaped microchannel, were considered. The effect of the geometrical patterns of micromixers, as well as of the Reynolds number on flow regimes and mixing efficiency were analyzed. The Reynolds number varied from 1 to 300. Unlike other studies, the efficiency of the considered mixers was for the first time compared with the cost of pressure loss during pumping. As a result, the efficiency of the most optimal micromixer in terms of hydraulic mixing and the optimal operation ranges were determined. It was shown that the maximum normalized mixing efficiency in the entire range of Re numbers was noted for mixer, in which a vortex-based intensification of mixing occurs due to the flow swirling in cylindrical chambers. This mixer allows mixing the fluids 600 times more efficiently than a straight T-mixer, while all other conditions being equal.

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Saenko, O. A., and W. J. Merryfield. "On the Effect of Topographically Enhanced Mixing on the Global Ocean Circulation." Journal of Physical Oceanography 35, no. 5 (May 1, 2005): 826–34. http://dx.doi.org/10.1175/jpo2722.1.

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Abstract The strong influence of enhanced diapycnal mixing over rough topography on bottom-water circulation is illustrated using results from two global ocean model experiments. In the first, diapycnal diffusivity is set to the observed background level of 10−5 m2 s−1 in regions not subject to shear instability, convection, or surface-driven mixing. In the second experiment, mixing is enhanced above rough bottom topography to represent the dissipation of internal tides. Three important results are obtained. First, without the enhanced mixing in the abyssal ocean, the deep North Pacific Ocean becomes essentially a stagnant basin, with little bottom-water circulation and very weak deep stratification. Allowing for the enhanced diapycnal mixing above rough bottom topography leads to increased bottom-water circulation and deep stratification and a potential vorticity distribution in the North Pacific that is much more realistic. Second, the enhanced diapycnal mixing above rough topography results in a significant intensification and deepening of the Antarctic Circumpolar Current, as well as in stronger bottom-water formation around Antarctica. Last, our experiments suggest that dissipation of internal tides and the associated enhanced diapycnal mixing in the abyssal ocean play no part in the circulation of deep water forming in the North Atlantic Ocean and in the associated transport of heat in the ocean.

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Spodoba, M. O., and М. М. Zablodskiy. "Dependence of energy consumptions on the type of mechanical mixer used in the biogas reactor." Electrical Engineering and Power Engineering, no. 1 (March 31, 2021): 26–33. http://dx.doi.org/10.15588/1607-6761-2021-1-3.

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Purpose. Investigation of the dependence of the energy consumption of mechanical mixers and determination of an energy-efficient type of mixing device to increase the energy efficiency of the biogas formation process and the profitability of further processing into thermal and electrical energy. Methodology. Determination and analysis of energy costs for mechanical mixers, comparison and determination of their energy consumption in the process of biogas formation, generalization of the results. Findings. Biogas technologies play an important role in the formation of a modern energy system. The profitability of which directly depends on the energy efficiency of the processes of intensification of anaerobic fermentation. The process of anaerobic fermentation of waste is long, so one of the main methods of intensification of biogas production is the mixing of waste during anaerobic fermentation. Despite the large number of different types of mixing devices and systems, the main task of mixing is to create a homogeneous substance with the same temperature, acidity and other physicochemical components at any point in the volume of the substance. There is a need to increase the energy efficiency of the processes of intensification of anaerobic fermentation and the profitability of further processing of biogas into heat and electricity. Ways to improve energy efficiency are in certain dependences of the energy consumption of mechanical mixers, the choice of an energy-efficient type of mixer, certain criteria that significantly affect the consumption of electrical energy for mixing, the study of the vectors of propagation of flows created by the mixer. The implementation of these actions will allow you to establish the optimal geometric dimensions of the mixer and significantly increase the energy efficiency of biogas plants and further processing of the resulting biogas into thermal and electrical energy. Originality. The analysis of the reasons for different values of the Euler criterion for mechanical mixers is carried out with the same mode of the substance motion, its level and volume in the tank and other equal parameters. A comparative analysis of energy costs for the most common types of mechanical mixers in biogas reactors is carried out. It has been established that the use of a two-tier paddle mixer, which has two blades per tier, requires the least amount of energy to mix waste in a biogas reactor with a volume . Practical value. The data presented in this paper can be used in the design, construction and modernization of biogas plants. The direction of necessary further scientific researches is determined, the realization of which will increase the energy efficiency of biogas production and the profitability of further processing of biogas into thermal and electric energy.

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Llort, Joan, Marina Lévy, Jean-Baptiste Sallée, and Alessandro Tagliabue. "Onset, intensification, and decline of phytoplankton blooms in the Southern Ocean." ICES Journal of Marine Science 72, no. 6 (April 14, 2015): 1971–84. http://dx.doi.org/10.1093/icesjms/fsv053.

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Abstract The seasonal cycle of phytoplankton biomass in the Southern Ocean (SO) is characterized by a period of rapid accumulation, known as bloom, that is typical of high-latitude regions. Recent studies have illustrated how spatial and temporal dynamics of blooms in the SO are more complex than in other oceans. This complexity is likely related to differences in vertical mixing and the iron availability. In this work, we examine the sensitivity of bloom dynamics to changes in vertical mixing and iron availability using a biogeochemical model. Under idealized physical forcing, we produce seasonal cycles of phytoplankton for an ensemble of SO scenarios and we describe the bloom dynamics in terms of the net biomass accumulation rate. Based on this metric, we define three crucial bloom phases: the onset, the climax, and the apex. For the ensemble of modelled blooms, onsets always occur in winter and can be either bottom-up (increase in productivity) or top-down (decrease in grazing) controlled. Climaxes are mostly found in spring and their magnitudes are bottom-up controlled. Apexes are always found in late spring and strongly top-down controlled. Our results show that while a “strict” onset definition is consistent with a winter onset, the surface spring bloom is associated with the climax of the integrated bloom. Furthermore, we demonstrate that onset phase can be distinguished from climax phase using appropriate bloom detection methods based on surface satellite-based products. The ensemble of these results suggests that Sverdrup's blooming conditions are not indicative of the bloom onset but of the climax. We conclude that the recent bloom onset debate may partly be due to a confusion between what is defined here as the bloom onset and the climax, and that the SO observed complexity is due to the factors that control the climax.

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