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Experimental investigation of the mixing efficiency via intensity of segregation along axial direction of a rotating bar reactor
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作者 Abdelgadir Bashir Banaga Yan-Bin Li +2 位作者 Zhi-Hao Li Bao-Chang Sun Guang-Wen Chu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第7期153-159,共7页
As a significant index to evaluate the mixing efficiency,studying the concentration distribution is directly related to the intensity of segregation(I_(s)).In this work,the I_(s) of the mixture composed of NaCl soluti... As a significant index to evaluate the mixing efficiency,studying the concentration distribution is directly related to the intensity of segregation(I_(s)).In this work,the I_(s) of the mixture composed of NaCl solutionwater was investigated experimentally in a rotating bar reactor(RBR)by the conductivity method.The results showed that the mixing efficiency was improved along the axial direction from the bottom to the top in the RBR.The concentration distribution at the bottom section was more uneven,and I_(s) was higher compared with the top section,which decreased from 6.53×10^(-5)to 1.57×10^(-7).With the increase of rotational speed from 0 to 700 r·min^(-1),I_s at the bottom and top sections decreased from 4.27×10^(-3)to 7.10×10^(-5)and from 1.93×10^(-3)to 7.29×10^(-7),respectively.The increases flow rate of solution A,and the decreases of concentration of NaCl and flow rate of solution B gave rise to the reduction of I_(s),signifying an improved mixing efficiency.The results revealed that the conductivity method used in this paper has high efficiency and low cost to measure the I_(s),which indicates a promising prospect for estimating reactors'mixing performance. 展开更多
关键词 Intensity of segregation mixing efficiency Rotating bar reactor Conductivity method Concentration distribution
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High efficient mixed culture screening and selected microbial community shift for bioleaching process 被引量:6
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作者 李寿朋 郭宁 +2 位作者 武海艳 邱冠周 刘新星 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第6期1383-1387,共5页
To screen the high efficient mixed culture and understand the bioleaching behaviors of mixed culture for low-grade copper sulfide ore bioleaching,ten mixed cultures were collected and screened from different acid mine... To screen the high efficient mixed culture and understand the bioleaching behaviors of mixed culture for low-grade copper sulfide ore bioleaching,ten mixed cultures were collected and screened from different acid mine drainages obtained from sulfide mines of China.The leaching rate was set as criterion to screen the mixed culture and the metagenomic approach.Community genome array(CGA) was used for analyzing the mixed culture microbial community shift during the bioleaching process.The results indicate that the mixed culture obtained from Yinshan(YS) lead-zinc mine in Dexing of Jiangxi province in China reaches the maximum copper extraction(68.89%) during the one bioleaching period of 24 d.CGA results show that YS culture contains nine kinds of bacteria which are belong to six divisions,and the microbial community structure is changing during the bioleaching process.This provides a good way to accelerate the bioleaching process and reveals the microbial community shift during the bioleaching process. 展开更多
关键词 BIOLEACHING high efficient mixed culture community genome array(CGA) microbial community shift
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Effects of Magnetic Particles Entrance Arrangements on Mixing Efficiency of a Magnetic Bead Micromixer 被引量:4
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作者 Reza Kamali Seyed Alireza Shekoohi Alireza Binesh 《Nano-Micro Letters》 SCIE EI CAS 2014年第1期30-37,共8页
In this study, a computer code is developed to numerically investigate a magnetic bead micromixer under different conditions. The micromixer consists of a microchannel and numerous micro magnetic particles which enter... In this study, a computer code is developed to numerically investigate a magnetic bead micromixer under different conditions. The micromixer consists of a microchannel and numerous micro magnetic particles which enter the micromixer by fluid flows and are actuated by an alternating magnetic field normal to the main flow. An important feature of micromixer which is not considered before by researchers is the particle entrance arrangement into the micromixer. This parameter could effectively affect the micromixer efficiency. There are two general micro magnetic particle entrance arrangements in magnetic bead micromixers: determined position entrance and random position entrance. In the case of determined position entrances, micro magnetic particles enter the micromixer at specific positions of entrance cross section. However, in a random position entrance,particles enter the microchannel with no order. In this study mixing efficiencies of identical magnetic bead micromixers which only differ in particle entrance arrangement are numerically investigated and compared.The results reported in this paper illustrate that the prepared computer code can be one of the most powerful and beneficial tools for the magnetic bead micromixer performance analysis. In addition, the results show that some features of the magnetic bead micromixer are strongly affected by the entrance arrangement of the particles. 展开更多
关键词 Magnetic bead micromixer mixing efficiency Particle entrance arrangement
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Numerical Simulation of the Scalar Mixing Characteristics in Three-dimensional Microchannels 被引量:2
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作者 刘演华 林建忠 +1 位作者 包福兵 石兴 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第3期297-302,共6页
Based on the transport phenomena theory, the passive mixing of water and ethanol in different threedimensional microchannels is simulated numerically. The average variance of water volume fraction is used to index the... Based on the transport phenomena theory, the passive mixing of water and ethanol in different threedimensional microchannels is simulated numerically. The average variance of water volume fraction is used to index the mixing efficiency in the cases with different Reynolds number and different fabricated mixers. The results show that the efficiency of liquid mixing is progressively dependent on the convective transport as the Reynolds number increases. The efficiency of serpentine microchannel decreases with the increasing Reynolds number in the laminar regime. Altering the aspect ratio of channel inlet section has no significant effect on the mixing efficiency. Increasing the area of channel inlet section will cause the decrease of the mixing efficiency. The mixing in serpentine channels is the most efficient among three different mixers because of the existence of second flow introduced by its special structure. 展开更多
关键词 MICROCHANNEL MIXER mixing efficiency numerical simulation
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Study on the mixing of fluid in curved microchannels with heterogeneous surface potentials 被引量:1
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作者 林建忠 张凯 李惠君 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第11期2688-2696,共9页
In this paper the mixing of a sample in the curved microchannel with heterogeneous surface potentials is analysed numerically by using the control-volume-based finite difference method. The rigorous models for describ... In this paper the mixing of a sample in the curved microchannel with heterogeneous surface potentials is analysed numerically by using the control-volume-based finite difference method. The rigorous models for describing the wall potential and external potential are solved to get the distribution of wall potential and external potential, then momentum equation is solved to get the fully developed flow field. Finally the mass transport equation is solved to get the concentration field. The results show that the curved microchannel has an optimized capability of sample mixing and transport when the heterogeneous surface is located at the left conjunction between the curved part and straight part. The variation of heterogeneous surface potential ψn has more influence on the capability of sample mixing than on that of sample transport. The ratio of the curved microchanners radius to width has a comparable effect on the capability of sample mixing and transport. The conclusions above are helpful to the optimization of the design of microfluidic devices for the improvement of the efficiency of sample mixing. 展开更多
关键词 MICROCHANNEL mixing efficiency electroosmosis numerical simulation
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Analysis of micro vortex metallization and introduction of evaluation factor in mixing process
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作者 赫俊国 魏希柱 +1 位作者 姜涛 张杰 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第2期185-188,共4页
To improve the mixing efficiency in water purification or wastewater treatment process and understand the mechanism of mass transfer,and a suitable evaluation factor is introduced to evaluate the efficiency of mixing ... To improve the mixing efficiency in water purification or wastewater treatment process and understand the mechanism of mass transfer,and a suitable evaluation factor is introduced to evaluate the efficiency of mixing process.The diffusion mass transfer under turbulent condition is investigated based on dynamic and mathematical analysis.The results indicate that submicroscopic diffusion is the rate-limiting step in mass transfer,and the inertia effect of micro vortex causes the phase mixing.An excellent efficiency can be obtained by controlling the scale of micro vortex within millimeter.Furthermore,a new indicator named mixing factor(IH)is proposed to evaluate the efficiency of mixing processes,which is more feasible than conventional evaluation methods,because of its connection of mixing extent with energy consumption. 展开更多
关键词 mixing process micro vortex mixing efficiency mass transfer evaluating indicator
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Microfluidic field strategy for enhancement and scale up of liquid-liquid homogeneous chemical processes by optimization of 3D spiral baffle structure 被引量:1
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作者 Shuangfei Zhao Yingying Nie +7 位作者 Wenyan Zhang Runze Hu Lianzhu Sheng Wei He Ning Zhu Yuguang Li Dong Ji Kai Guo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第4期255-265,共11页
Due to the scale effect, the uniform distribution of reagents in continuous flow reactor becomes bad when the channel is enlarged to tens of millimeters. Microfluidic field strategy was proposed to produce high mixing... Due to the scale effect, the uniform distribution of reagents in continuous flow reactor becomes bad when the channel is enlarged to tens of millimeters. Microfluidic field strategy was proposed to produce high mixing efficiency in large-scale channel. A 3D spiral baffle structure(3SBS) was designed and optimized to form microfluidic field disturbed by continuous secondary flow in millimeter scale Y-shaped tube mixer(YSTM). Enhancement effect of the 3SBS in liquid-liquid homogeneous chemical processes was verified and evaluated through the combination of simulation and experiment. Compared with 1 mm YSTM, 10 mm YSTM with 3SBS increased the treatment capacity by 100 times, shortened the basic complete mixing time by 0.85 times, which proves the potential of microfluidic field strategy in enhancement and scale-up of liquid-liquid homogeneous chemical process. 展开更多
关键词 mixing efficiency Chemical process intensification Scale up REACTOR Computational fluid dynamics(CFD) Numerical simulation
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Design factors affecting the dynamic performance of soil suspension in an agitated, baffled tank
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作者 M.Moayeri Kashani S.H.Lai +1 位作者 S.Ibrahim P.Moradi Bargani 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第12期1664-1673,共10页
The effects of particle size, impeller clearance and impeller speed are assessed to show how condition variations influence power consumption in the water-solid slurry suspension in an agitated tank. The energy effici... The effects of particle size, impeller clearance and impeller speed are assessed to show how condition variations influence power consumption in the water-solid slurry suspension in an agitated tank. The energy efficiency of slurry height variation, impeller type and diameter, and solid movement speed has been investigated with six soil series stirred in a soil-water slurry. Coarser sand particles are observed to significantly increase power consumption, while finer particles, for instance clay, decrease the stirring power requirement. The 3-blade HR100 SUPERMIX? impeller manufactured by SATAKE generally performs more efficiently than a conventional4-pitched blade turbine. The impeller's geometric design, including diameter and number of blades influences the impeller's energy efficiency, and HR100 impellers with greater diameters remarkably reduce power consumption. The tests demonstrated that the power required to provide off-bottom solid suspension and solid dispersion can be reduced dramatically by increasing the slurry height rather than by accelerating the impeller, if this option is possible. 展开更多
关键词 Energy efficiency Stirred tank Water-solid slurry mixing Solid suspension Impeller geometry
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Numerical research on mixing characteristics of different injection schemes for supersonic transverse jet 被引量:11
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作者 LEE ChunHian 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第4期883-893,共11页
A numerical method using AUSMDV scheme and k-ω SST turbulence model with an explicit compressibility correction was developed,and a 3-D numerical simulation of a supersonic flow field with a vertical sonic jet of hyd... A numerical method using AUSMDV scheme and k-ω SST turbulence model with an explicit compressibility correction was developed,and a 3-D numerical simulation of a supersonic flow field with a vertical sonic jet of hydrogen was performed.Good agreement between numerical results and experimental data validated the reliability of the numerical method.Whereafter,two parameters,mass-weighted average total pressure and mixing efficiency,were defined to evaluate the mixing performance of different injection schemes.Based on the numerical method and evaluation criterion,the mixing characteristics of different injection schemes were studied in detail.It was found that for the mixing field of supersonic transverse jet,the near-field mixing is controlled by convection transport while the far-field mixing is controlled by mass diffusion;the circular-hole injection causes a loss of total pressure comparable to the slot injection,but can induce a much higher mixing efficiency because of its 3-D flow characteristic;the variation of injection angle under circular-hole injection mainly affects the near-field mixing degree,and among the five injection angles studied in the present paper,angle 120° is the optimal one;with the increase of the ratio between injector space and diameter,the induced mixing efficiency increases while the caused loss of total pressure can grow greatly;the two-stage injection method designed through reducing the injector area to keep the same hydrogen mass flowrate can induce a much higher mixing efficiency while only a bit larger loss of total pressure when compared to the single-stage injection,and hence the two-stage injection is superior to the single-stage injection.The research results can direct the design of the fuel injection method in the combustor of scramjet engine. 展开更多
关键词 supersonic mixing mixing efficiency injection scheme numerical simulation
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Mixing of two different electrolyte solutions in electromagnetic rectangular mixers 被引量:4
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作者 Meimei WEN Chang Nyung KIM Yue YAN 《Journal of Hydrodynamics》 SCIE EI CSCD 2016年第1期114-124,共11页
This study proposes a new electromagnetic rectangular mixer, and numerically examines the mixing characteristics of two different electrolyte solutions in the device under a uniform magnetic field. The mixer consists ... This study proposes a new electromagnetic rectangular mixer, and numerically examines the mixing characteristics of two different electrolyte solutions in the device under a uniform magnetic field. The mixer consists of a conduit with electrodes equipped on its top and bottom walls. The difference in the electric potentials applied to the sets of electrodes induces the current. The combination of the induced current and magnetic field yields Lorentz force, resulting in the fluid motion for pumping and mixing of the two different fluids. The numerical simulation is carried out with the use of commercial software CFX. The present numerical model is validated by an existing numerical work. The effect of different variables on mixing efficiency is investigated in many different cases with two different heights of the duct and various input voltages of the electrodes. The current simulation results indicate that the mixing performance can be enhanced by using multiple sets of electrodes and applying higher input voltages(absolute values) to the electrodes. 展开更多
关键词 CFX electrolyte solution Lorentz force mixer mixing efficiency
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DEM simulations of tote blenders for enhanced axial mixing efficiency 被引量:1
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作者 Fuhai Yu Zhihao Yao +2 位作者 Guojie Chen Yun Zhang Yang Zheng 《Particuology》 SCIE EI CAS CSCD 2021年第2期199-208,共10页
The mixing performance of a multi-bladed tote blender is investigated using a graphics processing unit-based discrete element method program.The positioning,dimensions,and applicability of the baffles are systematical... The mixing performance of a multi-bladed tote blender is investigated using a graphics processing unit-based discrete element method program.The positioning,dimensions,and applicability of the baffles are systematically studied according to the axial mixing efficiency.The results indicate that the novel inclined multi-bladed baffles can break the symmetrical axial granular flow and introduce a more efficient convective flow into the granular mixing in the axial direction of the tote blender.Owing to the joint effects of convective mixing and asymmetrical granular flow,the axial mixing efficiency is increased by a factor of nearly 20.More importantly,the novel baffle placement approach exhibits excellent applicability to different operating conditions,particle shapes,and blender sizes.Additionally,the inclined baffles can prevent the segregation caused by shape discrepancies and improve the mixing homogeneity in the steady state.The novel baffle design is promising for applications in more complex industrial blenders for achieving a high axial mixing efficiency. 展开更多
关键词 Discrete element method(DEM) Tote blender Axial mixing efficiency Inclined baffles Non-spherical particles
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Effect of droplet superficial velocity on mixing efficiency in a microchannel
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作者 Jin-yuan QIAN Lei ZHAO +2 位作者 Xiao-juan LI Wen-qing LI Zhi-jiang JIN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2022年第10期783-794,共12页
In this study, droplet characteristics including droplet length and formation time, and mixing efficiency in droplets were investigated via the volume of fluid(VOF) method coupled with a user defined scalar(UDS) model... In this study, droplet characteristics including droplet length and formation time, and mixing efficiency in droplets were investigated via the volume of fluid(VOF) method coupled with a user defined scalar(UDS) model. A cross-shaped junction with a square cross-section was designed and used for droplet formation. An initial arrangement which differed from that of a conventional operation was adopted. Results show that when the droplet superficial velocity is constant, the exchange between the dispersed phase velocity and the continuous phase velocity has a marginal effect on the droplet formation time.However, the exchange has a great effect on droplet length. These findings provide a valuable guide for future operation of droplet formation. In addition, the results show that the mixing efficiency in the droplet forming stage can be classified into time-dominated and length-dominated regimes according to the droplet superficial velocity. When a droplet flows in a microchannel,a higher droplet superficial velocity increases mixing efficiency due to the faster inner circulation and shorter droplet length. 展开更多
关键词 Droplet characteristics mixing efficiency Inner circulation Droplet superficial velocity
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