Reynolds parallel-film model

Unfortunately, the thin lamella resists instantaneous fluid exchange. According to the simple Reynolds parallel-film model QA,15) adopted below, this hydrodynamic resistance is inversely 3... 

Reynolds relation requires liquid drainage from the film to follow strictly the axial symmetry between parallel walls. Rigid surfaces ensure such drainage through their non-deformability, while non-equilibrium foam films are in fact never plane-parallel. This is determined by the balance between hydrodynamic and capillary pressure. Experimental studies have shown that only microscopic films of radii less than 0.1 mm retain their quasiparallel surfaces during thinning, which makes them particularly suitable for model... 

Film thinning is modeled using a modified Reynolds equation [41] for the flow between two circular parallel disks, which gives the rate of film thinning as ... 

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