论文标题
弹性湍流使分层多孔介质中的流体传输均匀
Elastic turbulence homogenizes fluid transport in stratified porous media
论文作者
论文摘要
许多关键的环境，工业和能源过程都依赖于在地下多孔介质中控制流体运输。这些培养基通常在结构上是异质的，通常具有不同渗透率的垂直层层 - 导致跨层流的流量分配不均匀，这是不可取的。在这里，使用直接的原位可视化，我们证明了聚合物添加剂可以通过诱导纯粹的弹性流动不稳定性来匀浆，从而在单个地层中产生随机的时空波动和过量的流动性。特别是，我们发现这种不稳定性在较小的渗透率地层中以较小的施加流速产生，将流动转向低渗透率地层并有助于使流动均匀。在实验的指导下，我们开发了一个平行抗压模型，该模型可以定量预测该均质化对给定分层培养基进行优化的流速。因此，我们的工作提供了一种新的方法，可以使流体和被动标量传输在异质多孔介质中。
Many key environmental, industrial, and energy processes rely on controlling fluid transport within subsurface porous media. These media are typically structurally heterogeneous, often with vertically-layered strata of distinct permeabilities -- leading to uneven partitioning of flow across strata, which can be undesirable. Here, using direct in situ visualization, we demonstrate that polymer additives can homogenize this flow by inducing a purely-elastic flow instability that generates random spatiotemporal fluctuations and excess flow resistance in individual strata. In particular, we find that this instability arises at smaller imposed flow rates in higher-permeability strata, diverting flow towards lower-permeability strata and helping to homogenize the flow. Guided by the experiments, we develop a parallel-resistor model that quantitatively predicts the flow rate at which this homogenization is optimized for a given stratified medium. Thus, our work provides a new approach to homogenizing fluid and passive scalar transport in heterogeneous porous media.
