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MOLECULAR DYNAMIC SIMULATION AND EXPERIMENTS ABOUT FLOW CHARACTERISTICS OF DEIONIZED WATER IN NANOTUBES

Volumen 9, Ausgabe 1, 2018, pp. 47-56
DOI: 10.1615/SpecialTopicsRevPorousMedia.2017022650
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ABSTRAKT

The experiments about deionized water flow through microtubes and nanotubes and the molecular dynamic simulation (MDS) results are used to study the flow characteristics in porous media. The MDS results show that the fluid molecules are absorbed to form a sticky layer onto the hydrophilic solid walls, the velocity of liquid cannot increase quickly until the driving pressure is large enough to overcome the resistance from the sticky layer. The experiments are used to verify the MDS results, and the experimental results show that the Hagen–Poiseuille (H–P) equation is valid when the microtube diameter is 15.59 μm. However, the H–P equation fails to accurately describe the nanofluidic mechanics; the flux of water through the nanotubes is even less than the H–P equation by one order of magnitude. The experiments and the MDS all show that the sticky layer decreases with the increase of the driving pressure, and the nonlinear relationship between the thickness of sticky layer and driving pressure is the main reason for the nonlinear flow characteristics under nanoscale.

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