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Settlement prediction model of slurry suspension based on sedimentation rate attenuation

Water Science and Engineering 2012年第1期5卷 79-92页

作者： Shuai-jie GUO Fu-hai ZHANG Bao-tian WANG Chao ZHANG Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098P.R.China Institute of Geotechnical Engineering Hohai UniversityNanjing 210098P.R.China Bureau of Hydrology Changjiang Water Resources CommissionWuhan 430012P.R.China

This paper introduces a slurry suspension settlement prediction model for cohesive sediment in a still water environment. With no sediment input and a still water environment condition, control forces between settling particles are significantly different in the process of sedimentation rate attenuation, and the settlement process includes the free sedimentation stage, the log-linear attenuation stage, and the stable consolidation stage according to sedimentation rate attenuation. Settlement equations for sedimentation height and time were established based on sedimentation rate attenuation properties of different sedimentation stages. Finally, a slurry suspension settlement prediction model based on slurry parameters was set up with a foundation being that the model parameters were determined by the basic parameters of slurry. The results of the settlement prediction model show good agreement with those of the settlement column experiment and reflect the main characteristics of cohesive sediment. The model can be applied to the prediction of cohesive soil settlement in still water environments.

关键词： cohesive sediment sedimentation rate attenuation slurry suspension settlement prediction model settlement column experiment

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Investigation of dense slurry suspensions with coaxial mixers:Influences of design variables through tomography and mathematical modelling

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Particuology 2022年第6期20卷 1-16页

作者： Prakash Mishra Farhad Ein-Mozaffari Department of Chemical Engineering Ryerson UniversityTorontoM5B 2K3Canada

The coaxial mixers enhance the suspension of concentrated slurries in an agitated *** this research work,the complex slurry suspension and dissemination behavior in a coaxial slurry mixing system(comprised of a close clearance anchor rotating with a low speed and an inner axial impeller rotating with a high speed)was analyzed employing ERT(electrical resistance tomography,a non-intrusive flow visualization technique),and computational fluid dynamics(CFD).The numerical models were validated by comparing the axial solid concentration profiles generated using the ERT data and the CFD simulation *** influences of various important parameters such as the diameter of the inner axial impeller,the inner impeller type,and the inner impeller spacing on the hydrodynamic characteristics of the slurry suspensions in a coaxial mixing vessel were thoroughly *** radial and axial velocity profiles of solid particles were generated using the validated mathematical *** assessment of energy loss due to the solid-solid collisions,the particle-fluid frictions,and the particle-vessel wall collisions was *** evaluation of optimum inner impeller clearance and inner impeller diameter is essential to attain a high degree of solids suspension and dissemination in a coaxial slurry mixing system.

关键词： Coaxial mixer slurry suspension Homogeneity Mixing index Electrical resistance tomography(ERT) Computational fluid dynamics(CFD)

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