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Random loose packing of small particles with liquid cohesion
AIChE Journal ( IF 3.7 ) Pub Date : 2018-11-19 , DOI: 10.1002/aic.16440
Hongsheng Chen 1 , Wenwei Liu 2 , Shuiqing Li 1
Affiliation  

Random packing of wet grains is numerically investigated using a multiscale discrete element method. The cohesion between wet grains is evaluated by the Weber number, with which the macroscopic and microscopic properties of wet packing are compared with those of dry systems. The effect of capillary force on wet packing partially resembles that of van der Waals force on the dry adhesive packing, because both packing fraction (ϕ) and coordination number (Z) of wet packing decrease with increasing surface tension, following a Boltzmann‐like exponential decay that leads to a metastable state with ϕ ≈ 0.37 and Z ≈ 3.8. The decay processes of wet grains, however, are much faster than that of dry ones due to the additional liquid‐phase viscous dissipation. Moreover, in the cases of strong cohesion, the relationship between Z and ϕ can be well interpreted by the Edwards' ensemble theory, while those with weak cohesion follow an exponential formula instead. © 2018 American Institute of Chemical Engineers AIChE J, 65: 500–511, 2019

中文翻译:

小颗粒的散乱堆积,具有液体内聚力

使用多尺度离散元方法对湿颗粒的无规堆积进行了数值研究。湿颗粒之间的内聚力通过Weber数来评估,通过该值将湿包装的宏观和微观特性与干系统的宏观和微观特性进行比较。毛细管力对湿填料的影响部分类似于范德华力对干粘合剂填料的影响,因为湿填料的填料分数(ϕ)和配位数(Z)随表面张力的增加而降低,遵循玻尔兹曼型指数衰减导致that≈0.37和Z≈3.8的亚稳态。然而,由于额外的液相粘性耗散,湿粮的腐烂过程比干粮的腐烂过程快得多。而且,在强大的凝聚力的情况下,爱德华兹的合奏理论可以很好地解释Z和relationship之间的关系,而内聚力较弱的人则遵循指数公式。©2018美国化学工程师学会AIChE J,65:500–511,2019
更新日期:2018-11-19
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