Insight into the pressure-induced displacement mechanism for selecting efficient nanofluids in various capillaries,Environmental Science: Nano

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Insight into the pressure-induced displacement mechanism for selecting efficient nanofluids in various capillaries
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-04 , DOI: 10.1039/d0en00462f
Xiao Wang _{1,

2,

3,

4,

5} , Zhiliang Zhang _{1,

2,

3,

4,

5} , Jun Zhang _{6,

7,

8,

9} , Jianying He _{1,

2,

3,

4,

5}

Affiliation

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.

中文翻译：

洞察压力诱导的位移机制，以选择各种毛细管中的高效纳米流体

设计用于调节两相驱替的流体由于其在地下水修复，石油采收和海水淡化中的作用而引起了人们的极大兴趣。当前，观察到流体的驱替效率取决于毛细管的表面性质和外部压力。在此，通过分子动力学模拟研究了各种毛细管中的压力引起的位移机制。我们的结果表明，表面润湿性和压力对于流体的驱替性能至关重要。具体而言，降低流体的界面张力有利于疏水毛细管中的置换效率，而增加流体的粘度有利于亲水性毛细管。根据我们提出的机制并考虑毛细管的润湿性，设计了三种类型的纳米流体来提高不同毛细管的置换效率。我们的结果对于理解流体流动现象具有重要意义，并为多种应用提供了一种设计目标流体的有效方法。

更新日期：2020-09-18

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