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The effects of wall roughness on the methane flow in nano-channels using non-equilibrium multiscale molecular dynamics simulation

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Abstract

This paper presents a non-equilibrium multiscale molecular dynamics simulation method to investigate the effects of periodic wall surface roughness on the structure and mass transfer of methane fluid through the silicon nano-channels. In order to accurately capture the trajectories and microstructure of methane nano-fluidics, the present modification of OPLS fully atomic model is employed. Meanwhile, we introduce the corresponding coarse-grained model to solve the problem of wall–fluid interaction for methane Poiseuille flow within silicon atomic walls using the classical Lorentz–Berthelot mixing rules. The geometries of the upper wall roughness are modeled by rectangular waves with different amplitudes and wavelengths. The three-dimensional number densities of C (H) atom and kinetic energy distribution plots give a clear observation of the impacts of surface roughness on the localization micro-information of methane fluid. Moreover, the slip length of fluid over rough surface decreases with the increase in amplitude. The diffusion coefficients appear anisotropic, and the radial distribution functions decrease with the increase in the amplitude. These properties should be taken into account in the design of energy-saving emission reduction nano-fluidic devices. All numerical results also indicate that the presented method not only can well solve the issue of wall–fluid interactions, but also could accurately predict the micro-information and dynamic properties of methane Poiseuille flow.

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Acknowledgements

We are very grateful to the anonymous referees who have provided us with valuable comments and suggestions for improving our study. This work is financially supported by the National Basic Research Program of China (973 Program) (Grant No. 2012CB025903), the Major Research Plan of the National Natural Science Foundation of China (Grant No. 91434201) and the National Natural Science Foundation of China (Grant Nos. 11402210, 11671321).

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Authors and Affiliations

  1. Department of Applied Mathematics, Northwestern Polytechnical University, Xi’an, 710129, China

    Chuntao Jiang, Jie Ouyang, Wuming Li, Xiaodong Wang & Lihua Wang

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  1. Chuntao Jiang
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  2. Jie Ouyang
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  3. Wuming Li
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  4. Xiaodong Wang
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  5. Lihua Wang
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Correspondence to Jie Ouyang.

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Jiang, C., Ouyang, J., Li, W. et al. The effects of wall roughness on the methane flow in nano-channels using non-equilibrium multiscale molecular dynamics simulation. Microfluid Nanofluid 21, 92 (2017). https://doi.org/10.1007/s10404-017-1927-2

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