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Numerical Simulation of Erosion-Corrosion in the liquid-solid two-phase flow

Chinese Journal of Chemical Engineering 2000年第4期8卷 347-355页

作者：张政程学文郑玉贵柯伟姚治铭 CollegeofChemicalEngineering BeijingUniversityofChemicalTechnologyBeijing100029China EnvironmentalProtectionResearchInstitute BeijingResearchInstituteofChemicalIndustryBeijing100013China InstituteofCorrosionandProtectionofMetals ChineseAcademySciencesShenyang110015China

Erosion-corrosion of liquid-solid two-phase flow occurring in a pipe with sudden expansion in cross-section is numerically simulated in this paper. The global model for erosion-corrosion process includes three main components: the liquid-solid two-phase flow model, erosion model and corrosion model. The Eulerian-Lagrangian approach is used to simulate liquid-solid two-phase flow, while the stochastic trajectory model was adopted to obtain properties of particle phase. two-way coupling effect between the fluid and the particle phase is considered in the model. The accuracy of the models is tested by the data in the reference. The comparison shows that the model is basically correct and feasible.

关键词： erosion-corrosion liquid-solid two-phase flow stochastic trajectory model two-way coupling

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MATHEMATICAL MODELS FOR liquid-solid two-phase flow

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International Journal of Sediment Research 2000年第3期 288-298页

作者： Weiming Wu and Sam S.Y. Wang National Center for Computational Hydroscience and Engineering, The University of Mississippi, MS 38677, U.S.A.

The governing equations, interphase actions, constitutive relations and turbulence closures of the twofluid model and diffusion model for the liquid-solid two-phase flow are studied in this paper. The pressure actions in and between two phases are analyzed, and the governing equations of the two-fluid model are conveniently closed by adding the interphase pressure-difference force into the pressure terms of momentum equations. The constitutive relations for the liquid-solid mixture in the diffusion model are given by the models of Newtonian fluid and Bingham fluid, and the Bingham relation of shear stress and deformation rate for the single-directional shear flow of the mixture is extended to a general form for the multi-directional shear flow. The equation for the interphase velocity difference, which is used to close the generalized diffusion model, is derived from the momentum equations of two-fluid model and then simplified to more useful forms. For the turbulent flow, the mean movement equations of the two-fluid model and diffusion model are derived by using Reynolds averaging method. The closure techniques for the mean movement equations on the levels of zero-order turbulence model and κ-ε turbulence model are suggested. This paper presents the general basis of the mathematical models, which is to be followed by their validations and applications in the near future.

关键词： liquid-solid two-phase flow Diffusion model two-fluid model Governing equations Interphase actions Constitutive relations Continuous medium Newtonian fluid Bingham fluid Turbulent flow Reynolds averaging method Turbulence models κ-

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An Interpolation Method of Particle Distribution Reconstruction in liquid-solid two-phase flow using Ultrasonic Diffraction Tomography

An Interpolation Method of Particle Distribution Reconstruct...

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第三十九届中国控制会议

作者： Jialin Zhang Chao Tan Feng Dong Tianjin Key Laboratory of Process Measurement and Control Tianjin School of Electrical and Information EngineeringTianjin University

In liquid-solid two-phase flow,the solid-phase particles distribution is important for further analysis of two-phase flow *** the small particles,such as 1 mm-3 mm in size,which the particle size is close to the ultrasonic wavelength,the ultrasonic diffraction phenomenon *** phased array probes can be used to collect ultrasonic diffraction information to reconstruct the particle *** ultrasonic diffraction tomography（UDT） is immature in practical applications,small errors in the interpolation steps during the reconstruction process will have a great impact on the ***,a natural neighbor interpolation（NNI） method is introduced to minimize the error.A series of simulation experiments were designed,and the reconstruction results of the NNI method were compared with the reconstruction results of the bilinear interpolation（BLI） method and bicubic interpolation（BCI） method,which verified the feasibility and effectiveness of the NNI method for UDT.

关键词： liquid-solid two-phase flow solid-phase distribution ultrasonic diffraction tomography natural neighbor interpolation

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Investigation on effect of drag models on flow behavior of power-law fluid–solid two-phase flow in fluidized bed

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Particuology 2022年第11期70卷 43-54页

作者： Zihan Yuan Shuyan Wang Baoli Shao Lei Xie Yujia Chen Yimei Ma Key Laboratory of Enhanced Oil Recovery of Ministry of Education School of Petroleum EngineeringNortheast Petroleum UniversityDaqing 163318China

In this study,a Eulerian-Eulerian two-fluid model combined with the kinetic theory of granular flow is adopted to simulate power-law fluid–solid two-phase flow in the fluidized *** new power-law liquid–solid drag models are proposed based on the rheological equation of power-law fluid and pressure *** called model A is a modified drag model considering tortuosity of flow channel and ratio of the throat to pore,and the other called model B is a blending drag model combining drag coefficients of high and low particle *** are compared with experimental data measured by Lali et al.,where the computed porosities from model B are closer to the measured data than other ***,the predicted pressure drop rises as liquid velocity increases,while it decreases with the increase of particle *** results indicate that the increases of consistency coefficient and flow behavior index lead to the decrease of drag coefficient,and particle concentration,granular temperature,granular pressure,and granular viscosity go down accordingly.

关键词： Power-law liquid-solid drag models Power-law fluid liquid-solid two-phase flow Eulerian-Eulerian two-fluid model

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Numerical simulation and experimental study on eggshell membrane separation device

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International Journal of Agricultural and Biological Engineering 2019年第2期12卷 173-183页

作者： Yuan Chi Yong Wang Mengfu Li Jie Ren Yujie Chi College of Engineering Northeast Agricultural UniversityHarbin 150030China College of Food Science Northeast Agricultural UniversityHarbin 150030China

In order to provide theoretical guidance for separating egg membrane from eggshell by using mechanical agitation,CFD was used to explore the flow characteristics in stirred tank,using the Sliding Grid method to deal with the impeller rotational velocity zone in flow field,and using the Euler model to deal with liquid-solid two-phase *** study explored the influence of dish-shape bottom or flat-shape bottom,the clearance size between baffle and the side wall,and the axial height of impeller to bottom on suspension state of particles,solids holdup distribution,solid phase velocity and power number by *** results showed that better particles suspension effect in dish-shape tank can reduce particles accumulation at the bottom and power *** there was a small clearance size(S)between the baffle and the side wall of the stirred tank,it would reduce particles accumulation at the bottom,and reduce the power ***,too large S would decrease the suspension height of particles,not only cannot strengthen the main flow,but also lead to most fluid through clearance forming tangential flow,simulation results showed that S=6 mm was *** decreased axial height of impeller(C)to bottom,particles accumulation at the bottom was decreased,but power consumption would increase,simulation results showed that C=H/5(H is height of liquid surface)was *** to the simulation results,the structure of the stirring tank was *** the same time,the influences of stirring rotational velocity,stirring time,solid-liquid ratio and separating medium temperature on egg membrane recovery were also studied by experiment,and optimal parameter combination of factors was *** experiment results showed while the stirring time was 17.1 min,stirring rotational velocity was 350 r/min,solid-liquid ratio was 1:17 g/mL,the separating medium temperature was 32℃,the membrane recovery rate can reach above 89%.The device improves the recovery a

关键词： liquid-solid two-phase flow mechanical stirring field characteristics eggshell membrane separation

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