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cfd-dem analysis of particle polydispersity on the performance of fluidised bed reactor during silane pyrolysis Author links open overlay panel

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Particuology 2024年第8期91卷 72-87页

作者： Akshayveer Vijay M.Shinde MS2Discovery Interdisciplinary Research Institute Wilfrid Laurier UniversityWaterlooOntarioN2L3C5Canada Department of Chemical Engineering Indian Institute of Technology(BHU)Varanasi221005India

A cfd-dem model is developed for chemical vapour deposition of silane in a fluidized bed reactor to investigate the effect of polydispersity on local phase dynamics,mass and heat transport,as well as the rate of Si *** gas-phase fines formation and heterogeneous deposition on the seed particle,as well as the scavenging effect for Si particle growth,are *** method is first validated against the experimentally measured Si deposition rate,percentage of fine production and minimum fluidisation ***,the properties,primarily particle intermixing,fluidisation behaviour and bubble dynamics along with the deposition process,are analyzed for several polydisperse beds under various operating *** effect of polydispersity of the bed on a fraction of the bubble size,dense phase expansion and interchange coefficient between various phases is thoroughly investigated to establish a correlation with reactor *** results show that broad-Gaussian particle size distribution(PSD)exhibits excellent improvement in fluidisation behaviour,resulting in a high deposition rate,and minimum formation of Si fines.

关键词： cfd-dem method Chemical vapour deposition(CVD) Particle size distribution Silicon Gas-solid fluidized bed

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Simulation of proppant transport at intersection of hydraulic fracture and natural fracture of wellbores using cfd-dem

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Particuology 2022年第4期20卷 112-124页

作者： Siamak Akhshik Majid Rajabi Department of Mechanical Engineering Sharif University of TechnologyIran Sustainable Manufacturing Research Laboratory School of Mechanical EngineeringIran University of Science and TechnologyIran

Proppants transport is an advanced technique to improve the hydraulic fracture phenomenon,in order to promote the versatility of gas/oil reservoirs.A numerical simulation of proppants transport at both hydraulic fracture(HF)and natural fracture(NF)intersection is performed to provide a better understand-ing of key factors which cause,or contribute to proppants transport in HF-NF *** fluid dynamics(cfd)in association with discrete element method(dem)is used to model the complex interactions between proppant particles,host fluid medium and fractured *** effect of non-spherical geometry of particles is considered in this model,using the multi-sphere *** interaction forces between fluid flow and particles are considered in the computational ***,the inter-actions of particle-particle and particle-wall are taken into account via Hertz-Mindlin *** results of the cfd-dem simulations are compared to the experimental *** is found that the cfd-dem sim-ulation is capable of predicting proppant transport and deposition quality at intersections which are in agreement with experimental *** results indicate that the HF-NF intersection type,fluid velocity and NF aperture affect the quality of blockage occurrence,presenting a new index,called the blockage coefficient which indicates the severity of the blockage.

关键词： Hydraulic fracture process Proppants transport cfd-dem method HF-NF intersection Blockage coffcient

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