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| The viscosity of interfacial fluid confined in nanoscale channel |
| Received:January 25, 2020 Revised:April 13, 2021 |
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| DOI：10.7511/jslx20210125001 |
| KeyWord:interfacial fluid molecular dynamics nanoscale channel density viscosity |
| Author | Institution |
| 段晓璐 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 叶鑫 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 郑勇刚 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 张洪武 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
| 叶宏飞 |
大连理工大学 工程力学系 工业装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| Fluid-filled micro- and nano- scale pores are ubiquitous in nature and have wide applications in industry.The trend is towards high precision and miniaturization.Understanding the change in the physical properties of the fluid induced by the small confinement is crucial for the relevant natural phenomena and industrial developments.In this paper,based on molecular dynamics simulations,platinum layers are utilized to construct two-dimensional nanoscale channels to examine the physical properties of the confined Lennard-Jones (LJ) fluid and water.According to the distributions of density,shear stress and viscosity along the channel height,we determine the thicknesses of the boundary layer as 4.8 Å and 4.6 Å for LJ fluid and water,respectively.Based on the interfacial fluid in the mentioned boundary region,it is revealed that the viscosity of interfacial fluid increases relatively to the viscosity of bulk fluid at macroscale.The viscosity of interfacial fluid increases with increasing the solid-fluid interaction but decreases with increasing lattice constant of channel surface.A universal equation for estimating the viscosity of interfacial fluid by contact angle is proposed on the basis of the present computational results.This work provides valuable reference and guidance for the transport performance of nanoscale channels and the relevant tunable strategy through the channel design. |
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