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When a very thin capillary is inserted into a liquid, the liquid is suckedinto it: this imbibition process is controlled by a balance of capillary anddrag forces, which are hard to quantify experimentally, in particularlyconsidering flow on the nanoscale. By computer experiments using a genericcoarse-grained model, it is shown that an analysis of imbibition forced by acontrollable external pressure quantifies relevant physical parameter such asthe Laplace pressure, Darcy's permeability, effective pore radius, effectiveviscosity, dynamic contact angle and slip length of the fluid flowing into thepore. In determining all these parameters independently, the consistency of ouranalysis of such forced imbibition processes is demonstrated.

Forced Imbibition - a Tool for Determining Laplace Pressure, Drag Force and Slip Length in Capillary Filling Experiments