title: Time-dependent fluid squeeze-out between solids with rough surfaces.
abstract: We study the time dependency of the (average) interfacial separation between an elastic solid with a flat surface and a rigid solid with a randomly rough surface, squeezed together in a fluid. As an application we discuss fluid squeeze-out between a tire tread block and a road surface. Some implications for the leakage of seals are discussed, and experimental results are presented to test the theory. The theoretical prediction for the leak rate as a function of the fluid pressure difference is in good agreement with the experimental data for all fluid pressures up to "lift-off", where the fluid pressure equals the nominal rubber-substrate squeezing pressure.
authors.affiliation: IFF, FZ Jülich, D-52425, Jülich, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Lorenz
authors.forename: B N J
authors.initials: BN
authors.lastname: Persson
mesh_terms: D004548:Elasticity; D008962:Models, Theoretical; D011312:Pressure; D012408:Rubber / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D012996:Solutions; D012408:Rubber