Slippery-sticky transition of interfacial fluid slip

Abstract

The influence of temperature on interfacial fluid slip, as measured by molecular dynamics simulations of a Couette flow comprising a Lennard–Jones fluid and rigid crystalline walls, is examined as a function of the fluid–solid interaction strength. Two different types of thermal behavior are observed, namely, the slippery and sticky cases. The first is characterized by a steep and unlimited increase in the slip length at low temperatures, while the second presents a vanishing slip length in this regime. As the temperature increases in relation to a characteristic value, both cases converge to finite slip lengths. A recently proposed analytical model is found to well describe both thermal behaviors, also predicting the slippery-sticky transition that occurs at a critical value of the fluid–solid interaction parameter, for which, according to the model, fluid particles experience a smooth average energy landscape at the interface.

Wettability State Transition and Interfacial Slip Analysis of the Hydrophobic Nanostructure Surface Controlled by an Electric Field

“…Pressure drop measurement via the microchannel method, particle image velocimetry (PIV), and torque measurement using a rheometer, fluorescence recovery technology, a surface force apparatus, a colloidal probe atomic force microscope, and other methods have been applied to observe wall slip. − Many scientific researchers have used numerical simulations to study fluid flow properties. − …”