Aeration and cohesive effects on flowability in a vibrating powder conveyor

Aeration and cohesive effects on flowability in a vibrating powder conveyor
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振动粉末输送机中通气和内聚力对流动性的影响

DOI:
10.1016/j.powtec.2022.117724
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发表时间:
2022
期刊:
影响因子:
5.2
通讯作者:
Weimer, Alan W.
Weimer, Alan W.
中科院分区:
工程技术2区
文献类型:
--
作者:
Hartig, Julia;Shetty, Abhishek;Conklin, Davis R.;Weimer, Alan W.

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为了研究气固耦合作用下粉料床的动力学行为,建立了一个充气振动对流的CFD-DEM模型。每个模拟都是通过仔细表征粗糙的多孔输送机底板和代表典型粉末床的四种候选粒度来准备的。粒径在20 ~ 250 μm之间的颗粒的振动对流趋势可以通过考虑每种粉末的最小流化速度和货车德瓦尔斯凝聚力的大小来解释。细粉在高凝聚力下的模拟表现出阻力和凝聚力的竞争效应;阻力促进粉料剥离,而凝聚力抑制接触分离。实验对流速度被观察到是在良好的协议与模拟的平均粉末速度之间的投掷数为0.25和0.50。
A CFD-DEM model for aerated vibratory convection was developed to explore the coupled gas-solid interactions governing bulk powder bed dynamics. Each simulation was prepared by carefully characterizing the rough, porous conveyor baseplate and four candidate particle sizes representative of typical powder beds. Trends in the vibratory convection of particles between 20 and 250 μm in diameter could be explained by considering each powder's minimum fluidization velocity and the magnitude of van der Waals cohesive forces. Simulations of fine powders under high cohesive forces exhibited competing effects from drag and cohesion; drag promotes powder-frit liftoff while cohesion suppresses contact separation. Experimental convection velocities were observed to be in good agreement with the simulated mean powder velocity for throw numbers between 0.25 and 0.50.
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