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CFD-DEM modelling of mixing and segregation of binary mixtures of ellipsoidal particles in liquid fluidizations

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Journal of Hydrodynamics 2019年第6期31卷 1190-1203页

作者： Esmaeil Abbaszadeh Molaei Aibing Yu Zongyan Zhou Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical EngineeringMonash UniversityClaytonVic 3800Australia

Solid-liquid fluidized beds of binary mixtures are widely used in many *** segregation may occur as particles can differ in size,density,or *** studies have been conducted in the past to understand the effects of particlesize and density on the mixing and segregation,but the effect of particle shape has not been well ***,in the present work,CFD-DEM approach is employed to perform a numerical analysis of the effect of particle shape on the particle mixing and segregation phenomenon in liquid fluidization *** particle shapes from oblate to prolate are produced by varying aspect ratio of ellipsoids from 0.25 to 3,and eight binary mixtures of spheres and ellipsoids are *** results show that when oblate or prolate particles are added to spheres,the segregation takes *** segregation degree increases with particle aspect ratio diverging from 1.0 and also liquid superficial *** relationship of mixing index with aspect ratio under different liquid velocities is established,and a detailed explanation is *** is revealed that increasing the projected area and hence the drag force results in the separation of ellipsoidal particles from spheres.

关键词： Mixing segregation binary mixture ellipsoids liquid fluidization CFD-DEM

Effects of volumetric fraction and included angle of composite particles on the discharge of binary mixtures in hoppers

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Particuology 2020年第4期18卷 80-90页

作者： Liange Ge Nan Gui Xingtuan Yang Jiyuan Tu Shengyao Jiang Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and SafetyMinistry of EducationTsinghua UniversityBeijing 100084China School of Engineering RMIT UniversityMelbourneVIC 3083Australia

The discharge behavior of particles is important in many industrial applications,such as in the core of a pebble bed reactor,which uses a hopper bed filled with many large *** this work,a mixture composed of two particle types,freely discharged from a pebble bed,is simulated using the discreteelement *** is a spherical pebble of diameter equal to that of the fuel pebble of the *** other is a composite particle comprising three spherical pebbles bonded *** included angleαof the three pebbles characterized the particle conformation,which may affect the discharge behavior of the *** effects of volume fraction of the multi-sphere x(equivalent to the number fraction)on the discharge are also *** patterns,number flow rate,discharge velocity,and mean force of the mixture are computed to help in revealing discharge *** results show that increasing eitherαor x reduces the discharge flow *** and correlations give a quantitative evaluation of the independent effects ofαand *** analysis of velocity and force explains the mechanism relevant to the main influencing factorsαand *** results are helpful in gaining a better understanding of the discharge feature of binary mixtures and in providing a quantitative evaluation of the discharge behavior of the reactor core,especially adverse failure conditions.

关键词： Pebble flow Particle flow Discharge flow Hopper bed binary mixture Discrete element method

Joint effects of heavy metal binary mixtures on seed germination,root and shoot growth,bacterial bioluminescence,and gene mutation

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Journal of Environmental Sciences 2013年第5期25卷 889-894页

作者： In Chul Kong Department of Environmental Engineering Yeungnam UniversityKyungbuk 712-749Korea

This investigation was to assess the joint effects of metal binary mixtures on seed germination,root and shoot growth,bacterial bioluminescence,and gene mutation based on the one toxic unit（1 TU）*** sensitivities and orders of toxicity of metal mixtures were observed among the *** general,mostly additive or antagonistic effects were observed,while almost no synergistic effects by the binary metal mixtures in all ***,the combined effects of heavy metals in the different bioassays were difficult to generalize since they were dependent on both chemical type and the organism used in each ***, these results indicate that a battery of bioassays with mixture chemicals as opposed to just a single assay with single metal is a better strategy for the bioassessment of environmental pollutants.

关键词： binary mixture bioluminescence heavy metal revertant mutation seed germination toxicity

Densities, Ultrasonic Speeds, Viscosities and Refractive Indices of binary mixtures of Benzene with Benzyl Alcohol,Benzonitrile, Benzoyl Chloride and Chlorobenzene at 303.15 K

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Chinese Journal of Chemistry 2005年第4期23卷 377-385页

作者： ALI,A. PANDEY,J.D. SONI,N.K. NAIN,A.K. LAL,B. CHAND,D. DepartmentofChemistry JamiaMilliaIslamia(CentralUniversity)NewDelhi110025India DepartmentofChemistry UniversityofAllahabadAllahabad211002U.P.India

Densities, ρ, ultrasonic speeds, u , viscosities, η , and refractive indices, n , of pure benzene, benzyl alcohol (BA), benzonitrile (BN), benzoyl chloride (BC), chlorobenzene (CB) and their thirty six binary mixtures, with benzene as common component, were measured at 303.15 K over the entire mole fraction range. From these experimental data the values of deviations in ultrasonic speed, Δ u , isentropic compressibility, Δk s , excess acoustic impedance, Z E , deviation in viscosity, Δη, and excess Gibbs free energy of activation of viscous flow, G *E , and partial molar isentropic compressibility, of BA, BN, BC and CB in benzene were computed. The variation of these derived functions with composition of the mixtures suggested the increased cohesion (molecular order) in the solution and that interaction (A‐B)>(A‐A) or (B‐B). Moreover, theoretical prediction of ultrasonic speed, viscosity and refractive index of all the four binary mixtures was made on the basis of empirical and semi‐empirical relations by using the experimental values of the pure components. Comparison of theoretical results with the experimental values was made in order to assess the suitability of these relations in reproducing the experimental values of u , η and n . Also, molecular radii of pure liquids and the average molecular radii of binary mixtures were evaluated using the corresponding refractive indices of pure liquids and binary mixtures. The average molecular radii of binary mixtures were found to be additive with respect to mole fraction of the pure component.

关键词： binary mixture excess function density ultrasonic speed viscosity refractive index

MONOMOLECULAR FILMS OF COPOLYMERS OF OXYETHYLENE AND OXYPROPYLENE, POLYPROPYLENE GLYCOL AND THEIR binary mixtureS

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Chinese Journal of Polymer Science 1989年第2期7卷 119-123页

作者：李外郎丁法祥顾惕人 Department of Chemistry and Institute of Physical Chemistry Peking UniversityBeijing

The behaviour of monolayers of copolymers of oxyethylene and oxypropylene (UH29 and UH68), polypropylene glycol (UHPPG)and their binary mixtures on air-water interface has been investigated carefully on compression-expansion cycles. The first compression isotherm is approximately an equilibrium one. In the UHPPG-UH29 and UHPPG-UH68 systems, the calculated average π-a curves based on simple additivity of the two individual components coincide with the experimental results reasonably well. It is suggested that the two components are miscible and form near-ideal solution at the air-water interface. The compression-expansion cycle experiments shows some degree of hysteresis. The order of degree of hysteresis for individual components is UH68>UH29>UHPPG. The explanation for the hysteresis is proposed.

关键词： Monolayer, Copolymer of oxyethylene and oxypropylene Polypropylene glycol binary mixture Compression-expansion

A Review on the Evaporation Dynamics of Sessile Drops of binary mixtures:Challenges and Opportunities

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Fluid Dynamics & Materials Processing 2021年第2期17卷 253-284页

作者： Pradeep Gurrala Saravanan Balusamy Sayak Banerjee Kirti Chandra Sahu Department of Mechanical and Aerospace Engineering Indian Institute of Technology HyderabadSangareddyTelanganaIndia Department of Chemical Engineering Indian Institute of Technology HyderabadSangareddyTelanganaIndia

The wetting and evaporation dynamics of sessile droplets have gained considerable attention over the last few years due to their relevance to many practical applications,ranging from a variety of industrial problems to several biological *** made of binary mixtures typically undergo complex dynamics due to the differential volatility of the considered components and the ensuing presence of thermocapillary *** these reasons,many research groups have focused on the evaporation of binary droplets using a variegated set of experimental,numerical,and purely theoretical *** from reviewing the state-of-the-art about the existing experimental,analytical,and computational techniques used to study the evaporation dynamics of binary sessile droplets,we also provide some indications about possible future research directions in this specific area.

关键词： Wetting dynamics evaporation sessile droplet binary mixture thermocapillary flow

Investigation of solids segregation of binary mixtures in a rotating drum at various Froude numbers

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Journal of Harbin Institute of Technology(New Series) 2010年第5期17卷 701-705页

作者：何玉荣门玉宾刘元春刘文铁 School of Energy Science & Engineering Harbin Institute of Technology Shenyang Aeroengine Research Institute Aviation Industry Corporation of China

To investigate the effect of the Froude number(Fr)on solid segregation in a rotating drum,a two dimensional mathematical modelling on solids behaviour in horizontally oriented rotating drums operated in rolling,cascading and cataracting modes has been carried out by using Euler-Euler multi-fluid model in Fluent6.2 *** particles and big particles are used in the work as binary mixtures to investigate segregation *** effect of Froude number(rotating velocity)on the flow field is *** is found that the model captures the main features of solids motion and segregation in the drum and numerical results agree well with limited experimental data for solid velocity.

关键词： Solids segregation binary mixture rotating drum Froude number numerical simulation

Excess Molar Volume and Apparent Molar Volume of binary mixtures of 2-Methyl-3-buten-2-ol with 1-Alcohol at 298.15K

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Chinese Journal of Chemical Engineering 2002年第4期10卷 454-458页

作者：刘迪霞李浩然邓东顺韩世钧 Department of Chemistry Zhejiang University Hangzhou 310027

Excess molar volumes (V^E_m) of binary mixtures of2-methyl-3-buten-3-ol [CH_3C(OH)(CH_3)CHCG_2] with four 1-alcohols:methanol, ethanol, 1-propanol and l-butanol at 298.15 K andatmospheric pressure are derived from density measurements with avibrating-tube densimeter. All the excess volumes are negative in thesystems over the entire composition range. The results are correlatedwith the Redlich-Kister equation. The effects of chain length ofl-alcohols on V^E_m are discussed. The apparent molar volumes of2-methyl-3-ol and l-alcohols are calculated respectively.

关键词： excess molar volume binary mixture 2-methyl-3-buten-2-ol l-alcohol

Operating range of magnetic stabilization flow regime for magnetized fluidized bed with Geldart-B magnetizable and nonmagnetizable particles

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Particuology 2022年第1期20卷 90-98页

作者： Weikang Hao Quanhong Zhu College of Chemical Engineering Hebei University of TechnologyTianjin 300401China Qingdao Institue of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101ShandongChina Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China

The magnetic stabilization flow regime could also be created forGeldart-Bnonmagnetizable particles pro-vided some magnetizable particles are introduced and the magnetic field is *** study aimed toexplore the size(d_(pM))and density(ρ_(pM))effects of magnetizable particles on its operating *** upperlimit(Umb;)could not be determined from the △P_(b)-U_(g)↓curve but could from analyzing the variation of △P_(b)-fluctuation with increasing U_(g).Due to the variation of U_(mfH)(lower limit)with d_(pM) and ppw,both U_(mbH)-U_(mfH) and(U_(mbH)-U_(mfH))/U_(mfH) were used to quantify the operating range of magnetic stabilization.U_(mbH)-U_(mfH) varied hardly with ρ_(pM) but increased significantly with decreasing ρ_(pM).(U_(mbH)-U_(mfH))/U_(mfH)increased as d_(pM) or ρ_(pM) *** was more difficult for the nonmagnetizable particles to escape fromthe network formed by the smaller/lighter magnetizable *** the same magnitude of change,dp had a stronger effect than ρ_(pM) on(U_(mbH)-U_(mfH))/U_(mfH).Neither U_(mbH)-U_(mfH) nor(U_(mbH)-U_(mfH):)/Uma variedmonotonously with the minimum fluidization velocity of the magnetizable particles,indicating that nostraightforward criterion for matching the magnetizable particles to the given nonmagnetizable particlescould be established based on their minimum fluidization velocities to maximize the operating range ofmagnetic stabilization.

关键词： Magnetized fluidized bed binary mixture Magnetic stabilization Operating range Nonmagnetizable particles Magnetization-FIRST