Key points are not available for this paper at this time.
The hydrodynamic wall location at which the slip boundary condition is applied lies inside the fluid. Its distance from the fluid-solid interface is a strong function of the fluid state and system properties and cannot be neglected. Accounting for this distance holds the key to correct calculations of slip as, for example, when reconciling equilibrium and nonequilibrium measurements.
Hadjiconstantinou et al. (Mon,) studied this question.