Granular fluidity in cohesive split-bottom granular flows
Granular fluidity in cohesive split-bottom granular flows
复制标题
DOI：
10.1103/physrevfluids.7.084306
复制
发表时间：
2022-08
影响因子：
2.7
通讯作者：
Dorian Faroux;Kimiaki Washino;T. Tsuji;Toshitsugu Tanaka
中科院分区：
文献类型：
--
作者：
Dorian Faroux;Kimiaki Washino;T. Tsuji;Toshitsugu Tanaka
尽管在最近的连续介质模型的重要进展，大多数非局部流变学仍然专用于干颗粒流。事实上，流行的理论，如非局部颗粒流动性（NGF）是唯一有效的干燥材料和扩展润湿颗粒尚未提出。为了解决这些缺点，分裂底部的几何形状受到毛细力的详细分析。这种流动的主要特点进行了解释和突出使用粗粒化的过程。特别是，从神经生长因子理论的颗粒流场进行了检查，并通过无量纲邦德数探索其与材料的粘结性的关系。通过限制范围的临界状态区域和使用归一化的颗粒温度的基础上，指数型内聚本构关系已经得到。这项工作加深了目前的理解粘性颗粒流，使建设一个有凝聚力的非局部流变学更近一步，并导致一个统一的神经生长因子和动力学理论框架的方式。
Despite important progresses in recent continuum modeling, most nonlocal rheologies remain exclusive to dry granular flows. Indeed, popular theories such as nonlocal granular fluidity (NGF) are only valid for dry materials and extensions for wetted particles have yet to be proposed. To address such shortcomings, a detailed analysis of the split-bottom geometry subject to capillary forces is presented. The principal features of such flow are explained and highlighted using a coarse-graining procedure. In particular, the granular fluidity field from the NGF theory is examined and its relationship with the cohesiveness of the material is explored through the dimensionless Bond number. By limiting the scope to critical-state areas and using normalizations based on the granular temperature, exponential-type cohesive constitutive laws have been obtained. This work deepens the current understanding of cohesive granular flows, brings the construction of a cohesive nonlocal rheology one step closer, and leads the way toward a unification of both NGF and kinetic theory frameworks.