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Segregation patterns in binary granular mixtures with same layer-thickness under vertical vibration
Powder Technology ( IF 5.2 ) Pub Date : 2017-12-01 , DOI: 10.1016/j.powtec.2017.07.010
Cheng Xu , Yahya Sandali , Gang Sun , Ning Zheng , Qingfan Shi

Abstract Inspired by the theoretical prediction [Phys. Rev. Lett. 86, 3423 (2001)] and the disputed experimental results [Phys. Rev. Lett. 89, 189601(2002), Phys. Rev. Lett. 90, 014302 (2003)] about the problem of granular segregation, we systematically investigate the pattern of binary granular mixtures consisting of same layer-thickness under vertical vibration. Various kinds of mixtures with different diameters and densities particles are poured into the glass cylinder that is sealed and evacuated to an air pressure less than 50 Pa to observe separation patterns. It is found that these granular mixtures behave like five kinds of segregation patterns for different driving control parameters, i.e., Brazil nut (BN), reversed Brazil nut (RBN), Mixed states, light-BN (LBN), and light-RBN (LRBN). The latter two regimes are neither purely segregated nor completely mixed states. Moreover, BN phenomenon takes place in the area of low density ratio and found to be independent of layer-thickness, while RBN is sensitive to both the layer-thickness and frequency and occurs at the large density ratio area. Our result may be helpful for the establishment of theory about the segregation and mixing of granular mixtures.

中文翻译:

垂直振动作用下同层厚二元颗粒混合物的离析规律

摘要受理论预测启发[Phys. 牧师莱特。86, 3423 (2001)] 和有争议的实验结果 [Phys. 牧师莱特。89, 189601(2002), 物理。牧师莱特。90, 014302 (2003)] 关于颗粒偏析问题,我们系统地研究了在垂直振动下由相同层厚组成的二元颗粒混合物的模式。将具有不同直径和密度的各种混合物颗粒倒入密封并抽真空至气压小于50Pa的玻璃圆筒中,观察分离模式。发现这些颗粒混合物在不同驱动控制参数下表现出五种偏析模式,即巴西坚果(BN)、反向巴西坚果(RBN)、混合状态、轻BN(LBN)和轻RBN( LRBN)。后两种制度既不是纯粹的隔离状态,也不是完全混合的状态。此外,BN现象发生在低密度比区域,并且与层厚无关,而RBN对层厚和频率都敏感,发生在大密度比区域。我们的结果可能有助于建立关于颗粒混合物的分离和混合的理论。
更新日期:2017-12-01
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