4.8 Article

Stagnation points control chaotic fluctuations in viscoelastic porous media flow

出版社

NATL ACAD SCIENCES
DOI: 10.1073/pnas.2111651118

关键词

viscoelastic fluid; porous media; stagnation point; elastic turbulence

资金

  1. Okinawa Institute of Science and Technology (OIST) Graduate University
  2. Cabinet Office, Government of Japan
  3. Japan Society for the Promotion of Science (JSPS) [20K14656, 21K03884]
  4. Swiss National Science Foundation
  5. Grants-in-Aid for Scientific Research [21K03884, 20K14656] Funding Source: KAKEN

向作者/读者索取更多资源

Research shows that introducing disorder into an ordered array of posts can promote chaotic fluctuations in viscoelastic flows through porous media, but the stability of pore geometry also depends on the nature of stagnation points exposed to the flow field.
Viscoelastic flows through porous media become unstable and chaotic beyond critical flow conditions, impacting widespread industrial and biological processes such as enhanced oil recovery and drug delivery. Understanding the influence of the pore structure or geometry on the onset of flow instability can lead to fundamental insights into these processes and, potentially, to their optimization. Recently, for viscoelastic flows through porous media modeled by arrays of microscopic posts, Walkama et al. [D. M. Walkama, N. Waisbord, J. S. Guasto, Phys. Rev. Lett. 124, 164501 (2020)] demonstrated that geometric disorder greatly suppressed the strength of the chaotic fluctuations that arose as the flow rate was increased. However, in that work, disorder was only applied to one originally ordered configuration of posts. Here, we demonstrate experimentally that, given a slightly modified ordered array of posts, introducing disorder can also promote chaotic fluctuations. We provide a unifying explanation for these contrasting results by considering the effect of disorder on the occurrence of stagnation points exposed to the flow field, which depends on the nature of the originally ordered post array. This work provides a general understanding of how pore geometry affects the stability of viscoelastic porous media flows.

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