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Keliu Wu1, Zhangxin Chen1, Jing Li2

  • 1Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada; wukeliu19850109@163.com zhachen@ucalgary.ca.

Proceedings of the National Academy of Sciences of the United States of America
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PubMed
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A new model explains water flow in nanopores using effective slip, significantly enhancing flow capacity predictions compared to traditional methods. This advances understanding for theoretical and industrial applications.

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nanoconfined water flownanoporesslipviscositywettability

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Area of Science:

  • Fluid dynamics
  • Nanotechnology
  • Physical chemistry

Background:

  • Controlling water flow in nanopores is crucial for scientific understanding and industrial uses.
  • Existing models often fail to accurately predict flow behavior in confined nanoscale environments.

Purpose of the Study:

  • To develop a simplified model for predicting water flow in nanopores.
  • To incorporate effective slip, encompassing true and apparent slip phenomena.

Main Methods:

  • Proposed a model based on effective slip, a combination of true slip (contact angle-dependent) and apparent slip (viscosity variation).
  • Validated the model against 53 diverse literature cases involving various nanopore dimensions and contact angles.

Main Results:

  • The model predicts confined water flow capacities 10⁻¹ to 10⁷ times greater than the no-slip Hagen-Poiseuille equation.
  • Results align with the majority of experimental and simulation data from existing literature.

Conclusions:

  • The effective slip model provides a more accurate framework for understanding confined water flow.
  • This work helps resolve discrepancies in flow capacity predictions from molecular dynamics simulations and experiments.