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Dissolutive flow in nanochannels: transition between plug-like and Poiseuille-like

  • Qing Miao
  • Quanzi Yuan
  • Ya-Pu Zhao
Research Paper
  • 83 Downloads
Part of the following topical collections:
  1. 2018 International Conference of Microfluidics, Nanofluidics and Lab-on-a-Chip, Beijing, China

Abstract

Dynamic properties of dissolutive flow in nanochannels were investigated by molecular dynamics simulations. It turned out that the liquid flow pattern changes greatly after the dissolution effect taken into consideration. Liquid inside the channel has a plug-like velocity profile when the dissolubility is low, whereas a Poiseuille-like flow was observed as the dissolubility increases. By introducing the dissolution term to molecular kinetic theory, we explained the physical mechanisms of velocity transition. During which a modified dimensionless Galilei number was proposed to describe the effect of main forces. The results showed that in pressure-driven flow, when the dissolubility is low, the dominant dissipation is the viscous dissipation and the theoretical model of insolubility is acceptable. However, as the dissolubility increases, the dissolving dissipation takes priority, which results in the velocity profiles becoming Poiseuille-like. In addition, we analyzed the evolution of fluid density, number of dissolved solid particles and concentration distribution of solute. The liquid density varying from layered oscillation to uniform distribution was obtained, which can be described by a critical number. The analysis of solute concentration helps to establish the scaling relation among the dissolution rate, convection velocity, and diffusion coefficient. These findings not only help to understand the physical mechanisms of dissolutive flow but also help to control and optimize the flow patterns in dissoluble channels.

Keywords

Dissolutive flow Nanochannels Transport properties Molecular dynamics simulation 

Notes

Acknowledgements

This work was jointly supported by the National Natural Science Foundation of China (NSFC, Grant nos. 11722223, 11672300, 11872363 and 51861145314), the CAS Key Research Program of Frontier Sciences (Grant no. QYZDJ-SSW-JSC019), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant no. XDB22040401).

Supplementary material

10404_2018_2146_MOESM1_ESM.docx (2.5 mb)
Supplementary material 1 (DOCX 2592 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Nonlinear Mechanics, Institute of MechanicsChinese Academy of SciencesBeijingPeople’s Republic of China
  2. 2.School of Engineering ScienceUniversity of Chinese Academy of SciencesBeijingPeople’s Republic of China

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