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Calibration of the DEM sliding friction and rolling friction parameters of a cohesionless bulk material

Particuology 2024年第9期92卷 126-139页

作者： Jonatan Marín Pérez Tugrul Comlekci yevgen Gorash Donald MacKenzie University of Strathclyde 75 Montrose StreetG11XJGlasgowUnited Kingdom

The discrete element method(DEM)has become a valuable tool for understanding the mechanical behaviour of granular assemblies,however,the accuracy of the DEM simulations depends on several interaction parameters such as the sliding friction and rolling friction ***,these parameters are estimated using bulk calibration approach(BCA)where the draw down test has been suggested as an effective way to approach these *** test provides up to four bulk criteria,the angle of repose,shear angle,mass flow rate and the mass loss which are used to narrow down the possible ***,there is still more research needed around it to fully understand how this methodology *** experimental and numerical study was carried out using the draw down test to assess the influence of different mass flow rates and particle shapes on DEM parameters for a cohesionless bulk *** is concluded that use of multi-sphere particles and three aperture sizes in the draw down test to calibrate the sliding and rolling friction parameters of a cohesionless bulk material can converge to a small feasible region in which a single combination of the friction coefficients can be *** calibrated sliding and rolling friction coefficients were validated using multi-sphere particles,where the maximum deviation was 5.9%from the experimental values.

关键词： Discrete element method Calibration Draw down Sliding friction Rolling friction Particle shape

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Development of a hybrid photo-bioreactor and nanoparticle adsorbent system for the removal of Co2,and selected organic and metal co-pollutants

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Journal of Environmental Sciences 2017年第7期29卷 41-53页

作者： Andrea A.Rocha Christian Wilde Zhenzhong Hu oleg nepotchatykh yevgen.n.zaren.o Parisa A.Ariya Department of Atmospheric&oceanic Sciences McGill UniversityMontrealQC H3A OB9Canada Department of Chemistry McGill UniversityMontrealQC H3A 0B9Canada Po-Laboratories Inc.Saint-LaurentQC H4T 1N3Canada

Fossil fuel combustion and many industrial processes generate gaseous emissions that contain a number of toxic organic pollutants and carbon dioxide（Co_2） which contribute to climate change and atmospheric *** is a need for green and sustainable solutions to remove air pollutants,as opposed to conventional techniques which can be expensive,consume additional energy and generate further *** developed a novel integrated bioreactor combined with recyclable iron oxide nano/micro-particle adsorption interfaces,to remove Co_2,and undesired organic air pollutants using natural particles,while generating *** semi-continuous bench-scale photo-bioreactor was shown to successfully clean up simulated emission streams of up to 45% Co_2 with a conversion rate of approximately 4%Co_2 per hour,generating a steady supply of oxygen（6 mmol/hr）,while nanoparticles effectively remove several undesired organic *** also showed algal waste of the bioreactor can be used for mercury *** estimated the potential Co_2 emissions that could be captured from our new method for three industrial cases in which,coal,oil and natural gas were *** a 30% carbon capture system,the reduction of Co_2 was estimated to decrease by about 420,000,320,000 and 240,000 metric tonnes,respectively for a typical 500 MW power *** cost analysis we conducted showed potential to scale-up,and the entire system is recyclable and *** further discuss the implications of usage of this complete system,or as individual units,that could provide a hybrid option to existing industrial setups.

关键词： Air pollution mitigation Climate change Co_2 capture Hybrid system nanoparticle adsorption interfaces

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