Suppressing viscous fingering in structured porous media.
Suppressing viscous fingering in structured porous media.
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DOI：
10.1073/pnas.1800729115
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发表时间：
2018-05-08
影响因子：
11.1
通讯作者：
Shokri N
中科院分区：
文献类型：
--
作者：
Rabbani HS;Or D;Liu Y;Lai CY;Lu NB;Datta SS;Stone HA;Shokri N
粘性指进通常发生在注入一种流体驱替多孔介质中的驻留流体的过程中。当注入流体的粘性低于被驱替的滞留流体时，通常会促进指进。我们提出了一种设计的多孔介质中的有序结构的形式，以抑制或触发（取决于应用程序）粘性指在多孔介质中，而不修改流体的性质或润湿性。我们利用孔隙尺度直接数值模拟，最先进的实验和分析，以获得预测工具，以评估各种参数对控制多孔介质中的粘性指进的影响。此外，我们还提出了影响粘性指进模式的参数空间的广义解析解和相图。在多孔介质中，当低粘度流体驱替高粘度驻留流体时，流体动力学不稳定性往往会激发出沿着流体-流体驱替前缘形成的指状突起。这种界面不稳定性在许多自然和工程驱替过程中是不期望的。我们报告了一种现象，即孔径沿着前路径的逐渐和单调的变化抑制粘性指进在不混溶驱替过程中，这似乎违背了常规的预期增强不稳定性与孔径的变化。实验和孔隙尺度的数值模拟相结合的分析模型的位移前沿形态作为孔径梯度的函数的特性。我们的研究结果表明，孔径的逐渐减小的作用，以抑制粘性指的流动条件的可预测的范围内（如预期的梯度渗流理论）。该研究提供了深入了解的方法来抑制不必要的界面不稳定性在多孔介质中，并提供了新的工程多孔介质，如交换柱，织物，纸张和膜的设计原则，其所需的不混溶的驱替行为。
Viscous fingering commonly takes place during injection of one fluid that displaces a resident fluid in a porous medium. Fingering normally is promoted where the injected fluid is less viscous than the resident fluid being displaced. We propose a design of a porous medium in the form of an ordered structure to suppress or trigger (depending on the application) viscous fingering in porous media without modifying fluid properties or wettability. We utilize pore-scale direct numerical simulations, state-of-art experiments and analysis to derive predictive tools to evaluate effects of various parameters on controlling viscous fingering in porous media. Moreover, we propose generalized analytical solutions and a phase diagram for the parameter space affecting viscous fingering patterns. Finger-like protrusions that form along fluid−fluid displacement fronts in porous media are often excited by hydrodynamic instability when low-viscosity fluids displace high-viscosity resident fluids. Such interfacial instabilities are undesirable in many natural and engineered displacement processes. We report a phenomenon whereby gradual and monotonic variation of pore sizes along the front path suppresses viscous fingering during immiscible displacement, that seemingly contradicts conventional expectation of enhanced instability with pore size variability. Experiments and pore-scale numerical simulations were combined with an analytical model for the characteristics of displacement front morphology as a function of the pore size gradient. Our results suggest that the gradual reduction of pore sizes act to restrain viscous fingering for a predictable range of flow conditions (as anticipated by gradient percolation theory). The study provides insights into ways for suppressing unwanted interfacial instabilities in porous media, and provides design principles for new engineered porous media such as exchange columns, fabric, paper, and membranes with respect to their desired immiscible displacement behavior.
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作者：
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影响因子：
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