Effects of impurity particles on flow slip on grooved surfaces
Phys. Rev. Fluids 10, 094202 – Published 18 September, 2025
DOI: https://doi.org/10.1103/h6s7-2z44
Abstract
In this work, we investigate the effects of impurity particles on the flow slip at nanogrooved superhydrophobic surfaces through many-body dissipative particle dynamics (MDPD) simulations. The local slip velocity, local slip length, and effective slip length are calculated by varying the surface wetting properties, concentration, mass, and size of the impurity particles. It is found that impurity particles greatly reduce the flow slip at the fluid-groove interface. Specifically, the slip velocity and the slip length decrease as the wetting property of the particle surface is enhanced. Furthermore, particle concentration also plays an important role in affecting the flow slip. The slip velocity and slip lengths decrease as the particle concentration is increased. The dependence of the effective slip length on the particle concentration follows the Philip model. In contrast, particle mass and size exhibit minor effects on the flow slip. The results in this work provide helpful information for regulating flow slip in fluidic systems containing impurity particles.
