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Recently, the authors considered a thin steady developed viscous liquid walljet passing the sharp trailing edge of a horizontally aligned flat plate undersurface tension and the weak action of gravity acting vertically in theasymptotic slender-layer limit (J. Fluid Mech. 850, pp. 924--953, 2018). Werevisit the capillarity-driven short-scale viscous--inviscid interaction, onaccount of the inherent upstream influence, immediately downstream of the edgeand scrutinise flow detachment on all smaller scales. We adhere to theassumption of a Froude number so large that choking at the plate edge isinsignificant but envisage the variation of the relevant Weber number of O(1).The aspect in the main focus, tackled essentially analytically, is thecontinuation of the structure of the flow towards scales much smaller then theinteractive ones and where it no longer can be treated as slender. As aremarkable phenomenon, this analysis predicts harmonic capillary ripples ofRayleigh type, prevalent on the free surface upstream of the trailing edge.They exhibit an increase of both the wavelength and amplitude as thecharacteristic Weber number decreases. Finally, the theory clarifies the actualdetachment process, unprecedented in the rational theories of flow separation.At this stage, the wetting properties of the fluid and the microscopicallywedge-shaped edge, viewed as infinitely thin on the larger scales, come intoplay. As this geometry typically models the exit of a spout, the predictedwetting of the wedge is related to what in the literature is referred to as theso-called teapot effect.

Developed liquid film passing a trailing edge: small-scale analysis and the `teapot effect' at large Reynolds numbers