Journal articles: 'Vortex mixer'

1

Georgescu, Iulia. "Vortex mixer." Nature Physics 11, no. 10 (October 2015): 800. http://dx.doi.org/10.1038/nphys3510.

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Swift, Richard. "Mini Vortex Mixer." Plastic and Reconstructive Surgery 136, no. 3 (September 2015): 407e—408e. http://dx.doi.org/10.1097/prs.0000000000001523.

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Yuan, Shuai, Mingyong Zhou, Tao Peng, Qiang Li, and Fengze Jiang. "An investigation of chaotic mixing behavior in a planar microfluidic mixer." Physics of Fluids 34, no. 3 (March 2022): 032007. http://dx.doi.org/10.1063/5.0082831.

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Achieving rapid mixing of different liquids in a short distance is important in various biochemical applications. Herein, a novel planar mixer with staggered Z-shaped baffles is proposed. Numerical investigations are carried out to evaluate its mixing ability based on mixing quality and pressure drop when the Reynolds number (Re) varies from 0.1 to 50. The Lyapunov exponent, the Poincaré map, and the vortex visualization are conducted to comprehensively analyze the chaotic state and the mixing mechanism. Results show that the proposed mixer exceeds 0.9 mixing efficiency when 0.1 ≤ Re and Re ≥ 8. As Re ≥ 8, different vortex patterns appear by changing the inlet configuration. The disturbance for fluids induced by a vortex on the mass transfer surface is not only dependent on its intensity but also related to the position of the vortex/vortex leg. The proposed planar mixer, inducing a single vortex or vortex pair with different directions, presents different mixing performance when the Re varies from 8 to 50, from which the approach of the rotating vortex that can mainly improve the mixing quality is found. This well explains the chaotic mixing behavior observed in the planar mixer with Z-shaped baffles, which to date has not been studied before. Furthermore, the micromixer is fabricated, tested, and applied for luminol–peroxide chemiluminescence detection to characterize its performance.

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Juraeva, Makhsuda, and Dong Jin Kang. "Mixing Performance of a Cross-Channel Split-and-Recombine Micro-Mixer Combined with Mixing Cell." Micromachines 11, no. 7 (July 15, 2020): 685. http://dx.doi.org/10.3390/mi11070685.

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A new cross-channel split-and-recombine (CC-SAR) micro-mixer was proposed, and its performance was demonstrated numerically. A numerical study was carried out over a wide range of volume flow rates from 3.1 μL/min to 826.8 μL/min. The corresponding Reynolds number ranges from 0.3 to 80. The present micro-mixer consists of four mixing units. Each mixing unit is constructed by combining one split-and-recombine (SAR) unit with a mixing cell. The mixing performance was analyzed in terms of the degree of mixing and relative mixing cost. All numerical results show that the present micro-mixer performs better than other micro-mixers based on SARs over a wide range of volume flow rate. The mixing enhancement is realized by a particular motion of vortex flow: the Dean vortex in the circular sub-channel and another vortex inside the mixing cell. The two vortex flows are generated on the different planes perpendicular to each other. They cause the two fluids to change their relative position as the fluids flow into the circular sub-channel of the SAR, eventually promoting violent mixing. High vorticity in the mixing cell elongates the flow interface between two fluids, and promotes mixing in the flow regime of molecular diffusion dominance.

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Nie, Xin, Lin Xiang Ding, Bing Guo, Li Bo Chen, and Hua Chen Pan. "Analysis of a New Adjustable Mixer Base on Large Eddy Simulation." Advanced Materials Research 594-597 (November 2012): 2763–69. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2763.

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Abstract. This paper presents a new type of adjustable mixing equipment, and the internal flow field of the adjustable mixer have been studied by using the model of LES(Large eddy simulation),and the pressure loss, the speed change and vortex scale have been studied. In conclusion, along with blades angle and number increases, the flow resistance increases violently, so the range of blade rotating angle should be controlled within 30 degrees. As the depth of the pipeline velocity is increasingly large, large velocity gradient is contributed to the collisions between the colloidal particles. In pre-mixed, the vortex effect of the pipeline highly enhances the vortex diffusion, and improves the mixing efficiency. The vortex strength will be reinforced and dimension will be reduced, with the vanes cutting the flow, which can help flocculation.

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Satou, Shin, Hiroto Hirano, and Shinpei Wada. "Mixing Behavior of Continuously Taylor Vortex Mixer." Proceedings of the Fluids engineering conference 2018 (2018): GS4–4. http://dx.doi.org/10.1299/jsmefed.2018.gs4-4.

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Eckerle, W. A., H. Sheibani, and J. Awad. "Experimental Measurement of the Vortex Development Downstream of a Lobed Forced Mixer." Journal of Engineering for Gas Turbines and Power 114, no. 1 (January 1, 1992): 63–71. http://dx.doi.org/10.1115/1.2906308.

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An experimental study was conducted to investigate the mixing processes downstream of a forced mixer. A forced mixer generates large-scale, axial (stirring) vorticity, which causes the primary and secondary flow to mix rapidly with low loss. These devices have been successfully used in the past where enhanced mixing of two streams was a requirement. Unfortunately, details of the mixing process associated with these lobed forced mixers are not well understood. Performance sensitivity to design variables has not been documented. An experiment was set up to investigate the mixing processes downstream of a mixer. Air flow was independently supplied to each side of the forced mixer by separate centrifugal blowers. Pressures were measured at the entrance to the lobes with a pitot-static probe to document the characteristics of the approaching boundary layer. Interior mean and fluctuating velocities were nonintrusively measured using a two-component laser-Doppler velocimetry (LDV) system for velocity ratios of 1:1 and 2:1. The wake structure is shown to display a three-step process where initially secondary flow was generated by the mixer lobes, the secondary flow created counterrotating vortices with a diameter on the order of the convolute width, and then the vortices broke down resulting in a significant increase in turbulent mixing. The results show that the mean secondary motion induced by the lobes effectively circulated the flow passing through the lobes. This motion, however, did not homogeneously mix the two streams. Turbulent mixing in the third step of the mixing process appears to be an important element in the enhanced mixing that has been observed with forced mixers. The length required for the flow to reach this third step is a function of the velocity ratio across the mixer. The results of this investigation indicate that both the mean secondary motion and the turbulent mixing occurring after vortex breakdown need to be considered for prediction of forced mixer performance.

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Wang, Fen, Zhi Xia He, Yue Ma, and Chang Si Li. "Numerical Simulation of the Hydrodynamic Cavitation of the Impinging Streams Mixer." Advanced Materials Research 945-949 (June 2014): 951–55. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.951.

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The impinging streams mixer is a new type micromixer. The cavitation phenomenon occurring in the mixers with T-shaped impinging streams (TS), conical impinging streams (CIS), vortex streams(VS) were investigated, respectively. The distribution of flow field in the mixer was simulated and calculated by commercial software Fluent 6.2.1. The results showed that under the same working conditions, a more obvious hydrodynamic cavitation may occur in the CIS type impinging stream than that in the CIS type or the VS type, and the vortex flow lead to an extension of the material residence time in the mixer. The distribution of turbulent kinetic energy and gas holdup were obtained by numerical simulating hydrodynamic cavitation under different entrance pressure conditions. It is showed that when the outlet pressure keeps a constant value, hydrodynamic cavitation can be enhanced by increasing the entrance pressure. The above research can be contributed to the producing of biodiesel and the solving of the key technical problem of oil and alcohol heterogeneous mixing.

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Jing, Dalei, and Xuekuan Zhan. "Fluid mixing behind a branched elastic flag connecting to a cylinder in channel flow." Physics of Fluids 34, no. 4 (April 2022): 047102. http://dx.doi.org/10.1063/5.0086462.

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This paper proposes a mixer with an elastic vortex generator consisting of a branched elastic flag connected to the rear of a cylinder in the mixing channel and studies the effects of the branching angle of the branching elastic flag and Reynolds number based on the cylinder diameter Red on the mixing modes of the fluid flow in the mixer. One free diffusion-induced mixing mode and two different vortex-induced mixing modes are found, and a phase diagram regarding the mixing modes of the fluid flow behind the elastic vortex generator is established. It is found that the elastic vortex generator is helpful for the transition of the mixing mode from free diffusion-induced mixing to vortex-induced mixing with the increasing branching angle. Furthermore, the rising Reynolds number results in the transition of mixing mode from free diffusion-induced mixing to vortex-induced mixing. In addition, the present work quantitatively studies the effects of the branching angle of the branched elastic flag and Reynolds number on the pressure loss and the outlet mixing efficiency of the mixer. It is found that the increase in pressure loss and the outlet mixing efficiency are 141.41% and 613.70% as the branching angle increases from 0° to 180° when Red = 90. In addition, the pressure loss and outlet mixing efficiency of the mixer with the branched elastic flag of branching angle θ = 180° can be 227.66% and 601.36% higher than those of the fluid flow around the cylinder without the elastic flag in the mixing channel when Red = 50.

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TATEKURA, Yuki, Rie TUKADA, Tomoko OGAWA, and Shin SATO. "101 Numerical Analysis of Improvement Taylor-Vortex Mixer." Proceedings of The Computational Mechanics Conference 2010.23 (2010): 27–28. http://dx.doi.org/10.1299/jsmecmd.2010.23.27.

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Fu, Lung-Ming, Wei-Ching Fang, Hui-Hsiung Hou, Yao-Nan Wang, and Ting-Fu Hong. "Rapid vortex microfluidic mixer utilizing double-heart chamber." Chemical Engineering Journal 249 (August 2014): 246–51. http://dx.doi.org/10.1016/j.cej.2014.03.037.

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Ansari, Mubashshir A., Kwang-Yong Kim, Khalid Anwar, and Sun Min Kim. "Vortex micro T-mixer with non-aligned inputs." Chemical Engineering Journal 181-182 (February 2012): 846–50. http://dx.doi.org/10.1016/j.cej.2011.11.113.

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Grünwald, Jürgen, Thomas Sattelmayer, and Sebastian Steinbach. "Vortex mixer for SCR-process in passenger cars." MTZ worldwide 66, no. 1 (January 2005): 19–21. http://dx.doi.org/10.1007/bf03227730.

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Zhang, Yanjie, and Aaron R. Clapp. "Preparation of quantum dot-embedded polymeric nanoparticles using flash nanoprecipitation." RSC Adv. 4, no. 89 (2014): 48399–410. http://dx.doi.org/10.1039/c4ra07788a.

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We developed a unique and efficient method to encapsulate quantum dots within amphiphilic polymer micelles using the flash nanoprecipitation technique and various micromixers (multi-inlets vortex mixer, MIVM, and confined impinging-jet mixer, CIJM).

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Miao, Bao Gang, Chao Hui Wang, Teng Fei Zheng, Qun Ming Zhang, and Zhuang De Jiang. "Micro-Drop Mixer Driven by Standing Surface Acoustic Waves (SSAW)." Advanced Materials Research 629 (December 2012): 521–23. http://dx.doi.org/10.4028/www.scientific.net/amr.629.521.

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High-frequency surface acoustic waves (SAW) were generated and transmitted along single-crystal lithium niobate (LiNbO3). The standing surface waves (SSAW) formed between two parallel inter-digital transducers (IDTs) on a LiNbO3 substrate, were employed to drive the micro-drop mixer. An SSAW device was designed, micro-machined and tested. When an AC signal with the frequency of 61.4MHz was applied to the IDTs, vortex appeared in the drop consisted of two incompatible liquid (ink and glycerol). The evolution of the vortex was recorded in this work. With the evolution of the vortex, mixing process of two incompatible liquid has been demonstrated. The mixer is of significant relevance for many bio-technological applications and in particular for lab-on-chip. While the experimental liquids were mutually incompatible, the ink could only be divided into smaller drops.

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Kim, Dae-Han, and Young-June Moon. "Control of Propeller Hub Vortex for Water Treatment Mixer." KSFM Journal of Fluid Machinery 19, no. 2 (April 1, 2016): 11–15. http://dx.doi.org/10.5293/kfma.2016.19.2.011.

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Russ, Boris, Ying Liu, and Robert K. Prud'homme. "OPTIMIZED DESCRIPTIVE MODEL FOR MICROMIXING IN A VORTEX MIXER." Chemical Engineering Communications 197, no. 8 (April 2010): 1068–75. http://dx.doi.org/10.1080/00986440903412985.

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18

Azam, Md Tauhedul, Donghyuk Kang, Hiroyuki Hirahara, Kazuhisa MURATA, and Yasufumi SHIMOJI. "Vortex Dynamics in Stirred Tank Mixer by Rotating Jets." Proceedings of the Fluids engineering conference 2018 (2018): OS8–12. http://dx.doi.org/10.1299/jsmefed.2018.os8-12.

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19

Koutmos, P., and J. J. McGuirk. "Velocity and Turbulence Characteristics of Isothermal Lobed Mixer Flows." Journal of Fluids Engineering 117, no. 4 (December 1, 1995): 633–38. http://dx.doi.org/10.1115/1.2817315.

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This work describes an experimental and computational study of flows in model multilobed mixers. Laser Velocimetry was used to obtain the velocity and turbulence fields in the downstream mixing duct. Flow development was quantified by examination of the large cross-plane velocities whose direction implied the formation of two streamwise vortices per lobe. A change from coplanar to scarfed geometry increased vortex strength by 25 percent. Vortex cell formation, roll-up and breakdown to fine scale mixing was attained within a distance of 5 lobe heights. The computational investigation of the coplanar configuration adopted a non-aligned mesh to solve the 3-D Reynolds averaged Navier-Stokes equations. The calculations of the lobe and mixing duct flows were coupled to predict the complete mixer. Comparisons between measurements and calculations using a standard k-ε model suggested good qualitative agreement with maximum disagreement of about 20 percent in peak radial velocities.

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Ansari, Mubashshir Ahmad, Kwang-Yong Kim, and Sun Min. "Integrated vortex micro T-mixer for rapid mixing of fluids." Journal of Mechanical Science and Technology 33, no. 12 (December 2019): 5923–31. http://dx.doi.org/10.1007/s12206-019-1137-9.

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King, R. "Flow-Induced Vibrations of Mixing Vessel Internals." Journal of Vibration and Acoustics 107, no. 2 (April 1, 1985): 253–58. http://dx.doi.org/10.1115/1.3269252.

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This paper draws together the results of research work undertaken at BHRA on cylinders excited to oscillate by flow within unbaffled mixing vessels. Oscillations of an anchor mixer and of dip tubes are described, including those cases in which the cylinders are mounted close to the vessel wall. The results are used to define guidelines for calculating safe operating limits of cylinders dipping into water, and for avoiding vortex excited oscillations of an anchor mixer by a device which actually improves its efficiency as a mixer.

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Dyrda, Vitalii, Anatolii Kobets, Ievgeniia Bulat, Serhii Slobodian, Mykola Lysytsia, Serhii Sokol, Vladimir Lapin, and Hennadii Ahaltsov. "Present problems of vibration isolation in heavy mining machines at long-term cyclic loads." E3S Web of Conferences 168 (2020): 00042. http://dx.doi.org/10.1051/e3sconf/202016800042.

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On the basis of the developed simulation model and the Boltzmann-Volterra integral relations with kernels of relaxation and aftereffect, an equation was worked out, which made it possible to take into account the rubber viscoelastic properties in full volume; in this equation, stiffness operator of elastic suspension in the machine is written by using fractional exponential function of the Yu. Rabotnov’s type; on the basis of the mathematical model, the basic parameters of the machine under the study were calculated; in particular, for the vortex mixer, the time dependences of amplitude of the mixer housing vibrations and coefficient of vibration isolation efficiency were calculated with taking into account aging of elastic link material in the machines; the calculation results were compared with the results of industrial tests of the vortex mixer operation lasting for 16 years. The theory and method for calculating vibration isolation systems with rubber elastic links for heavy mining machines were developed with taking into account material structure changes due to the effects of aging.

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Xu, Wei Xing, and Shou Qi Yuan. "Numerical Simulation of Agitated Flow Field of Submersible Mixer Based on Computational Fluid Dynamics." Applied Mechanics and Materials 34-35 (October 2010): 1545–48. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1545.

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The flow formulation is founded as console formulation first, and with the body-fitted coordinate system and standard turbulent model, the numerical simulation of the internal 3-D incompressible turbulent flow agitated flow field of submersible mixer is carried out by numerical simulation software Fluent. The results showed that: the mixer impeller produced vortex jet flow, the constant velocity lines advanced as ellipse, the velocity along the centerline are larger than others, and utilized volume flow to transport the liquid. And, by changing some design parameters of mixer impeller, we can compare and analyze the numerical simulation results and present some optimal methods.

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Wang, Chenfeng, Hanyang Liu, Xiaoxia Yang, and Rijie Wang. "Research for a Non-Standard Kenics Static Mixer with an Eccentricity Factor." Processes 9, no. 8 (August 1, 2021): 1353. http://dx.doi.org/10.3390/pr9081353.

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The Kenics static mixer is one of the most widely studied static mixers, whose structure–function relationship has been studied by varying its aspect ratio and modifying the surface. However, the effect of the symmetric structure of the Kenics static mixer itself on twisting the fluid has been neglected. In order to study how the symmetrical structure of the Kenics static mixer impacts the fluid flow, we changed the center position of elements at twist angle 90° and introduced the eccentricity factor γ. We applied LHS-PLS to study this non-standard Kenics static mixer and obtained the statistical correlations of the aspect ratio, Reynolds number, and eccentricity factor on relative Nusselt number and relative friction factor. We analyzed the results by comparing the PLS model with the univariate analysis, and it was found that the underlying logic of the Kenics static mixer with an asymmetric structure became different. In addition, a non-standard Kenics static mixer with an asymmetric structure was investigated using vortex generation and dissipation through fluid flow simulation. The results demonstrated that the classical symmetric structure has a minor pressure drop, but the backward eccentric one has a higher thermal-hydraulic performance factor. It was found that the nature of the eccentric structure is that two elements with different aspect ratios are being combined at θ=90°, and this articulation leads to non-standard Kenics static mixers with different underlying logic, which finally result in the differences between the PLS model and the univariate analysis.

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Yi, Min, and Zhigang Shen. "Fluid dynamics: an emerging route for the scalable production of graphene in the last five years." RSC Advances 6, no. 76 (2016): 72525–36. http://dx.doi.org/10.1039/c6ra15269d.

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Fluid dynamics emerging as a promising scalable and efficient way for graphene production is highlighted, with the emphasis set on vortex fluidic devices and pressure- and mixer-driven fluid dynamics and the perspectives on the open key issues.

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Bennett, Caswell R., Aisha Khatib, Justin M. Sierchio, and Edward Van Keuren. "Formation of hexamethylbenzene: chloranil charge transfer nanocrystals." Mundo Nano. Revista Interdisciplinaria en Nanociencias y Nanotecnología 13, no. 24 (November 8, 2019): 1e—11e. http://dx.doi.org/10.22201/ceiich.24485691e.2020.24.69612.

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The nucleation and growth of nanoparticles can be induced using the reprecipitation method, in which a solution is rapidly mixed with a miscible non-solvent. This method has been used to create a wide variety of organic nanoparticles, including those comprised of polymers or of small molecules. Here we demonstrate the formation of charge transfer nanocrystals of the electron donor hexamethylbenzene and electron acceptor chloranil using the reprecipitation method. We achieve the rapid mixing needed for nanoparticle formation in a number of ways: using a 3D printed vortex micro-mixer, a double impinging jet mixer or direct jet injection of the solution into the non-solvent. The crystal formation kinetics are characterized over times scales from 10 ms to tens of minutes using UV-Vis absorption spectroscopy and dynamic light scattering.

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De Veau, E. J. Ian. "Determination of Phenylbutazone Residues in Bovine Milk by Liquid Chromatography with UV Detection." Journal of AOAC INTERNATIONAL 79, no. 5 (September 1, 1996): 1050–53. http://dx.doi.org/10.1093/jaoac/79.5.1050.

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Abstract A published liquid chromatographic (LC) method was modified for quantitation of phenylbutazone (PBZ) residues in the range of 25-300 ng/mL in bovine milk. Milk samples (1 m└) were diluted with absolute ethanol and 25% NH4OH. Diethyl ether and petroleum ether were added sequentially to the milk extract and the mixture was agitated on a Vortex mixer to partition out milk fat. The organic phase was removed and discarded. Tetrahydrofuran- hexane (1 + 4) was added to the aqueous phase and the extract was acidified with 3M HCI. The samples were mixed on a Vortex mixer for 30 min, and centrifuged. The organic layer, containing PBZ, was transferred to a clean test tube. The organic solvents were evaporated to dryness under a stream of N2 at room temperature. The resulting extract was dissolved in 1 m└ mobile phase and filtered before injection. The chromatographic system was a C18 reversed-phase column connected to a UV detector set at 264 nm. Recoveries of PBZ from raw bovine milk fortified at 25- 300 ng/mL ranged from 79 to 84%; relative standard deviations (RSDs) ranged from 6 to 7%. The RSDs for incurred PBZ quantitated from 34 to 229 ng/mL ranged from 1 to 4%.

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Piralishvili, Sh A., and R. I. Ivanov. "Calculation and experimental investigation of mixture formation in a vortex mixer." Russian Aeronautics (Iz VUZ) 55, no. 2 (April 2012): 179–83. http://dx.doi.org/10.3103/s1068799812020109.

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Colosi, Joseph C., and Barbara Schaal. "Tissue grinding with ball bearings and vortex mixer for DNA extraction." Nucleic Acids Research 21, no. 4 (1993): 1051–52. http://dx.doi.org/10.1093/nar/21.4.1051.

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Yang, An-Shik, Yi-Fan Hsieh, Long-Sheng Kuo, Li-Yu Tseng, Shao-Kai Liao, and Ping-Hei Chen. "A novel vortex mixer actuated by one-shot electricity-free pumps." Chemical Engineering Journal 228 (July 2013): 882–88. http://dx.doi.org/10.1016/j.cej.2013.05.053.

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Shang, Xiaopeng, Xiaoyang Huang, and Chun Yang. "Mixing enhancement by the vortex in a microfluidic mixer with actuation." Experimental Thermal and Fluid Science 67 (October 2015): 57–61. http://dx.doi.org/10.1016/j.expthermflusci.2014.10.017.

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Kim, Soo Yeon, Jong Seong Chae, Sin Young Kim, Meng Yu Zhang, and Tea In Ohm. "A Study on Applicability of Coagulant Mixer and Flow Analysis of the Non-powered Vortex Mixer using CFD." Journal of Korean Society of Environmental Engineers 39, no. 12 (December 29, 2017): 706–13. http://dx.doi.org/10.4491/ksee.2017.39.12.706.

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Moradi, Hossein, and Farzan Barati. "Vibration Simulation of the cylindrical reservoir shell containing fluid vortex with the help of Vib-Shape software." Ciência e Natura 37 (December 21, 2015): 194. http://dx.doi.org/10.5902/2179460x20847.

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This paper addresses the simulation of the vibrational behavior of a flat-bottomed cylindrical reservoir in different levels of fluid vortex with the help of Vib-Shape software. The reservoir is equipped with a mixer, which creates fluid vortex and required loading. The compliance of the shell vibration mode shape of the mentioned model obtained from the collected data and simulation in the aforementioned software is compared with the mode shapes derived from the Donnell‘s theory. The results are in the good agreement with the governing theories of the problem.

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Xu, Wei Xing, and Shou Qi Yuan. "Numerical Analysis of Agitated Flow Field of Submersible Mixer." Advanced Materials Research 139-141 (October 2010): 2681–84. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2681.

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The flow formulation was founded as console formulation, and with the body-fitted coordinate system and standard k - ε turbulent model, the numerical analysis of the internal 3-D incompressible turbulent flow of the agitated flow field was carried out by CFD software Fluent. The results showed that: the mixer impeller produced vortex jet flow, the constant velocity lines advanced as ellipse, the velocity along the centerline are larger than others, and utilized volume flow to transport the liquid. And, by changing some design parameters of mixer impeller, we can compare and analyze the numerical analysis results and find that: for the same impeller diameter, the mixer impeller whose hub/tip radius ratio is smaller has larger advancing speed in the agitated flow field, and the advancing speed is more evenly distributed, so the overall effect is better. Therefore, we should select the hub diameter of the submersible mixer properly.

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Liu, Ying, Chungyin Cheng, Ying Liu, Robert K. Prud’homme, and Rodney O. Fox. "Mixing in a multi-inlet vortex mixer (MIVM) for flash nano-precipitation." Chemical Engineering Science 63, no. 11 (June 2008): 2829–42. http://dx.doi.org/10.1016/j.ces.2007.10.020.

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LEI, K., and W. LI. "A Novel In-Plane Microfluidic Mixer Using Vortex Pumps for Fluidic Discretization." Journal of the Association for Laboratory Automation 13, no. 4 (August 2008): 227–36. http://dx.doi.org/10.1016/j.jala.2008.03.008.

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Liou, Y. C., J. M. Miao, T. L. Liu, and S. J. Cheng. "Flow Mechanism of a Novel Active Micro-Rotor Mixer." Advanced Materials Research 488-489 (March 2012): 1177–83. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.1177.

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The purpose of this study is to investigate the complex vortex flow patterns within a novel active micro-rotor mixer under various Reynolds numbers and rotating speeds by employing of CFD technique. The concept of present micro-rotor mixer is inspired from the Wankel-type combustor which is widely used in the power machines. The configuration of present micro-mixer is consisted of a rotor with shape of triangle column, a blending chamber and individual inlet and outlet ports. The blending chamber is served as the mixing chamber since the separated three sub-regions will change their volumes as the rotor undergoing the rotating motion with a fixed eccentricity. The dynamic flow patterns and mixing process of two species within the mixing chamber were simulated and visualized with streak lines. The governing equations are unsteady, two-dimensional incompressible Navier-Stokes equation and the two working fluids are pure water and alcohol. The concentration equation for species is also solved to reveal the mass transfer process in various sub-regions then being calculated on the outlet port to evaluate the mixing efficiency. The dynamic mesh technique was applied to re-distribute the computational meshes when the rotor finished a complete rotation cycle. Inspection on the flow developing stages within the mixing chamber over one complete cycle, it seems that multi-vortex flow field was generated due to the interaction of the shear force from the rotor, viscous force and inertial force of working fluids. The Coanda flow appeared in some conditions. When the Reynolds number is below of 10, the rotating speed of rotor has less influence on the mixing efficiency. An obvious enhancement in the mixing efficiency can be found in cases of the rotating speed of rotor changed from 30 rpm to 150 rpm when the Reynolds number in range of 25 to 100. Generally, the maximum mixing efficiency of 85% can be achieved for 1<Re<100 which demonstrated that present design was effective for μ-TAS.

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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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Wu, Zhongli, Yu Li, Lei Xu, Dongmei Bao, Xiying Zhang, and Tingjian Zhang. "Numerical study of the passive micromixer with the novel blocks." AIP Advances 12, no. 4 (April 1, 2022): 045016. http://dx.doi.org/10.1063/5.0078400.

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The micromixer is a key component of the microfluidic chip analysis system. Micromixers are widely used in applications, such as DNA hybridization and protein synthesis. A high-efficiency mixer can speed up the biochemical analysis process. In order to study how to improve the mixing efficiency of the mixer, this paper designs passive micromixers with three different blocks: cylindrical, equilateral triangle, and square. The effects of them on the mixing performance and pressure drop of the mixer were studied, respectively. Through numerical simulation, the study shows that the mixing efficiency of the mixer with equilateral triangle blocks is 96% at Re = 100, and the maximum pressure drop is 18 135.8 Pa. In addition, through the analysis of three-dimensional numerical simulation, the block causes the fluid to generate a horizontal and vertical vortex flow state in the mixing unit, thereby breaking the laminar flow and greatly improving the mixing efficiency. Through structural optimization, ETOM4, which has four mixing units and a side length of 150 μm equilateral triangle blocks, is the best passive micromixer with its mixing efficiency of 99.1%.

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Xu, Wei Xing, and Ming Yue Fan. "Structure Reverse Design and CFD Analysis on Agitated Flow Field of Submersible Mixer." Advanced Materials Research 383-390 (November 2011): 25–31. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.25.

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The impeller of submersible mixer in some sewage treatment plant, whose parts are imported from other countries, is heavily abased. To solve this problem and realize domestic manufacture, based on reverse engineering theory, utilizing 3 coordinates measuring machine and applications of Surface and Pro/E, 3D solid model of impeller are gained. The gained impeller model accords with the physical one with high accuracy. The flow formulation is founded as console formulation first, and with the body-fitted coordinate system and standard turbulent model, the numerical simulation of the internal 3-D incompressible turbulent flow agitated flow field of submersible mixer is carried out by numerical simulation software Fluent. The results showed that: the mixer impeller produced vortex jet flow, the constant velocity lines advanced as ellipse, the velocity along the centerline are larger than others, and utilized volume flow to transport the liquid.

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Lemenand, Thierry, Pascal Dupont, Dominique Della Valle, and Hassan Peerhossaini. "Turbulent Mixing of Two Immiscible Fluids." Journal of Fluids Engineering 127, no. 6 (June 10, 2005): 1132–39. http://dx.doi.org/10.1115/1.2073247.

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The emulsification process in a static mixer HEV (high-efficiency vortex) in turbulent flow is investigated. This new type of mixer generates coherent large-scale structures, enhancing momentum transfer in the bulk flow and hence providing favorable conditions for phase dispersion. We present a study of the single-phase flow that details the flow structure, based on LDV measurements, giving access on the scales of turbulence. In addition, we discuss the liquid-liquid dispersion of oil in water obtained at the exit of the mixer/emulsifier. The generation of the dispersion is characterized by the Sauter diameter and described via a size-distribution function. We are interested in a local turbulence analysis, particularly the spatial structure of the turbulence and the turbulence spectra, which give information about the turbulent dissipation rate. Finally, we discuss the emulsifier efficiency and compare the HEV performance with existing devices.

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Chow, Shing Fung, Changquan Calvin Sun, and Albert Hee Lum Chow. "Assessment of the relative performance of a confined impinging jets mixer and a multi-inlet vortex mixer for curcumin nanoparticle production." European Journal of Pharmaceutics and Biopharmaceutics 88, no. 2 (October 2014): 462–71. http://dx.doi.org/10.1016/j.ejpb.2014.07.004.

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Costanzo, M. C., and T. D. Fox. "Transformation of yeast by agitation with glass beads." Genetics 120, no. 3 (November 1, 1988): 667–70. http://dx.doi.org/10.1093/genetics/120.3.667.

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Abstract We have found that agitation of Saccharomyces cerevisiae with glass beads and plasmid DNA using a vortex mixer results in genetic transformation of the yeast cells. This method is less efficient, but considerably more convenient, than other yeast transformation procedures. The fact that the minimal requirements for transformation are simply physical damage and the presence of DNA in an osmotically supportive environment suggests that this process may occur in nature.

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Han, Seok Young, J. Y. Park, Y. D. Kim, S. J. An, and J. S. Maeng. "Optimum Design of a Dynamic Micro-Mixer for Multiphase Flow." Key Engineering Materials 353-358 (September 2007): 2836–38. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2836.

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An active micro-mixer equipped with an oscillating stirrer is considered by analyzing the mixing behaviors, i.e. the effect of the Karman vortex, the flow structure after the stirrer, etc. The mixing was calculated by the D2Q9 model of Lattice Boltzmann methods. In this study, the time– averaged mixing index formula, I D , is newly proposed for time dependent flow. Three models are tested and the mixing indices are compared. From the results, it was found that the mixing of Model III is enhanced and stabilized much more than the other models. Therefore, an optimum design for a dynamic micro-mixer with an oscillating stirrer was performed. The design variables were established as the length, the angle and frequency of the stirrer. It is found that the optimal design variables are determined by 0.66, 107.9 o and 0.49 Hz.

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Качаев, Aleksandr Kachaev, Орехова, and Tat'yana Orehova. "DESCRIPTION OF THE VORTEX MOTION OF F TWO-PHASE FLOW IN A CONTINUOUS MIXER." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 2, no. 5 (April 28, 2017): 121–25. http://dx.doi.org/10.12737/article_590878fb7932c3.02818288.

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AZAM, Md Taurhedul, Donghyuk KANG, Hiroyuki HIRAHARA, Kazuhisa MURATA, and Yasufumi SHIMOTSUKASA. "Enhancement of rotating jet by spirally structured vortex tube in centrifugal bladeless mixer flow." Journal of Fluid Science and Technology 14, no. 2 (2019): JFST0010. http://dx.doi.org/10.1299/jfst.2019jfst0010.

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Wu, Chih-Yang, and Bing-Hao Lai. "Numerical Study of T-Shaped Micromixers with Vortex-Inducing Obstacles in the Inlet Channels." Micromachines 11, no. 12 (December 18, 2020): 1122. http://dx.doi.org/10.3390/mi11121122.

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To enhance fluid mixing, a new approach for inlet flow modification by adding vortex-inducing obstacles (VIOs) in the inlet channels of a T-shaped micromixer is proposed and investigated in this work. We use a commercial computational fluid dynamics code to calculate the pressure and the velocity vectors and, to reduce the numerical diffusion in high-Peclet-number flows, we employ the particle-tracking simulation with an approximation diffusion model to calculate the concentration distribution in the micromixers. The effects of geometric parameters, including the distance between the obstacles and the angle of attack of the obstacles, on the mixing performance of micromixers are studied. From the results, we can observe the following trends: (i) the stretched contact surface between different fluids caused by antisymmetric VIOs happens for the cases with the Reynolds number (Re) greater than or equal to 27 and the enhancement of mixing increases with the increase of Reynolds number gradually, and (ii) the onset of the engulfment flow happens at Re≈125 in the T-shaped mixer with symmetric VIOs or at Re≈140 in the standard planar T-shaped mixer and results in a sudden increase of the degree of mixing. The results indicate that the early initiation of transversal convection by either symmetric or antisymmetric VIOs can enhance fluid mixing at a relatively lower Re.

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Wang, Shengting, Xingwu Zhai, Yulin Shi, Long Chen, Yin Lv, Yinglin Zhang, Guixian Ge, and Xuhong Guo. "Continuous Surface Strain Tuning for NiFe-Layered Double Hydroxides Using a Multi-inlet Vortex Mixer." Industrial & Engineering Chemistry Research 59, no. 45 (November 2, 2020): 19897–906. http://dx.doi.org/10.1021/acs.iecr.0c03341.

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Suzuki, Hiroki, Shun Hamao, Yoshiki Seto, Hideyuki Sato, Jennifer Wong, Robert K. Prud’homme, Hak-Kim Chan, and Satomi Onoue. "New nano-matrix oral formulation of nanoprecipitated cyclosporine A prepared with multi-inlet vortex mixer." International Journal of Pharmaceutics 516, no. 1-2 (January 2017): 116–19. http://dx.doi.org/10.1016/j.ijpharm.2016.11.031.

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Ahmad Ansari, Mubashshir, Arees Qamareen, and Mohd Zahid Ansari. "Mixing of fluids in vortex T-mixer with two and four non-aligned inlet microchannels." IOP Conference Series: Materials Science and Engineering 691 (December 11, 2019): 012030. http://dx.doi.org/10.1088/1757-899x/691/1/012030.

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Journal articles on the topic 'Vortex mixer'

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