The flow behaviours of cohesive particles in the ring shear test were simulated and examined using discrete element method guided by a design of experiments methodology.A full factorial design was used as a screening design to reveal the effects of material properties of partcles.An augmented design extending the screening design to a response surface design was constructed to establish the relations between macroscopic shear stresses and particle properties.It is found that the powder flow in the shear cell can be classified into four regimes.Shear stress is found to be sensitive to particle friction coefficient,surface energy and Young's modulus.A considerable fluctuation of shear stress is observed in high friction and low cohesion regime.In high cohesion regime,Young's modulus appears to have a more significant effect on the shear stress at the point of incipient flow than the shear stress during the pre-shear process.The predictions from response surface designs were validated and compared with shear stresses measured from the Schulze ring shear test.It is found that simulations and experiments showed excellent agreement under a variety of consolidation conditions,which verifies the advantages and feasibility of using the proposed"Sequential Design of Simulations"approach.

Xizhong Chen;Chunlei Pei;James A.Elliott

Department of Materials Science and Metallurgy,University of Cambridge,Cambridge CB3 0FS,UK;Process and Chemical Engineering,School of Engineering,University College Cork,Cork T12 K8AF,Ireland;Department of Chemical and Biological Engineering,The University of Sheffield,Sheffield S10 2TN,UK;Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China

化学科学与工程前沿

[1]Xizhong Chen;Chunlei Pei;James A.Elliott-.A"Sequential Design of Simulations"approach for exploiting and calibrating discrete element simulations of cohesive powders)[J].化学科学与工程前沿,2022(06):874-885

partcles

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