Journal
ENVIRONMENTAL SCIENCE-NANO
Volume 7, Issue 9, Pages 2785-2794Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0en00462f
Keywords
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Funding
- Research Council of Norway
- Aker BP ASA
- Wintershall Norge AS via WINPA project [NANO2021, PETROMAKSII 234626]
- National Natural Science Foundation of China [U1663206]
- Norwegian Metacenter for Computational Science (NOTUR) [NN9110k, NN9391k]
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Designing fluids to regulate two-phase displacement has been of great interest because of their roles in groundwater remediation, oil recovery and water desalination. Currently, the displacement efficiency of fluids is observed to be dependent on the surface properties of capillaries and external pressure. Herein, pressure-induced displacement mechanisms in various capillaries are investigated by molecular dynamics simulations. Our results suggest that surface wettability and pressure are crucial to the displacement performance of fluids. Specifically, reducing the interfacial tension of fluids is beneficial to displacement efficiency in hydrophobic capillaries, while increasing the viscosity of fluids favors hydrophilic capillaries. Based on our proposed mechanisms and considering the capillaries' wettability, three types of nanofluids are designed to improve the displacement efficiency for different capillaries. Our results are significant for understanding fluid flow phenomena and provide an efficient way to design target fluids for numerous applications.
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