Jamming transition and emergence of fracturing in wet granular media
Jamming transition and emergence of fracturing in wet granular media
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DOI：
10.1103/physrevresearch.2.022012
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发表时间：
2020-04-13
影响因子：
4.2
通讯作者：
Juanes, Ruben
中科院分区：
文献类型：
--
作者：
Meng, Yue;Primkulov, Bauyrzhan K.;Juanes, Ruben
我们研究流体诱导的颗粒介质的变形，以及毛细作用和润湿性的裂缝模式的出现的基本作用。我们开发了一个流体力学计算模型，耦合的“移动电容器”的动态网络模型的两相流在孔隙尺度与颗粒力学的离散元模型。我们模拟缓慢注入的粘性较低的流体到摩擦颗粒填充最初饱和的粘性更大，不混溶的流体。我们研究了润湿性和初始堆积密度的影响，并发现四种不同的制度的流体入侵：空腔扩张和压裂，摩擦指，毛细管侵入，毛细管压实。我们解释断裂的开始出现从堵塞过渡，并综合系统的行为的形式堵塞湿颗粒介质的相图。
We study fluid-induced deformation of granular media, and the fundamental role of capillarity and wettability on the emergence of fracture patterns. We develop a hydromechanical computational model, coupling a "moving capacitor" dynamic network model of two-phase flow at the pore scale with a discrete element model of grain mechanics. We simulate the slow injection of a less viscous fluid into a frictional granular pack initially saturated with a more viscous, immiscible fluid. We study the impact of wettability and initial packing density, and find four different regimes of the fluid invasion: cavity expansion and fracturing, frictional fingers, capillary invasion, and capillary compaction. We explain fracture initiation as emerging from a jamming transition, and synthesize the system's behavior in the form of a phase diagram of jamming for wet granular media.