Nanoflow over a fractal surface

Michail Papanikolaou, Michael Frank, Dimitris Drikakis

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Abstract

This paper investigates the effects of surface roughness on nanoflows using molecular dynamics simulations. A fractal model is employed to model wall roughness, and simulations are performed for liquid argon confined by two solid walls. It is shown that the surface roughness reduces the velocity in the proximity of the walls with the reduction being accentuated when increasing the roughness depth and wettability of the solid wall. It also makes the flow three-dimensional and anisotropic. In flows over idealized smooth surfaces, the liquid forms parallel, well-spaced layers, with a significant gap between the first layer and the solid wall. Rough walls distort the orderly distribution of fluid layers resulting in an incoherent formation of irregularly shaped fluid structures around and within the wall cavities.
Original languageEnglish
Article number082001
Number of pages9
JournalPhysics of Fluids
Volume28
Issue number8
Early online date1 Aug 2016
DOIs
Publication statusE-pub ahead of print - 1 Aug 2016

Keywords

  • nanoflows
  • molecular dynamic simulation
  • fractal surface

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    Papanikolaou, M., Frank, M., & Drikakis, D. (2016). Nanoflow over a fractal surface. Physics of Fluids, 28(8), [082001]. https://doi.org/10.1063/1.4958975