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Flow measurements near a Reynolds ridge

By A. Warncke, M. Gharib and T. Roesgen


The Reynolds ridge is a well-known phenomenon first observed\ud in 1854 by Henry David Thoreau. It was then rediscovered\ud by Langton in 1872, but Reynolds was the first to recognize\ud that the surface tension difference was the physical mechanism\ud behind its formation and saw the equality between the case of\ud a spreading film and that of a stagnant film met by oncoming\ud flow. However, it wasn't until McCutchen in 1970 that the\ud prediction of a boundary layer forming beneath the film was\ud introduced as the cause of the surface deformation rise ahead\ud of the film due to the retardation of the flow. The first quantitative\ud theory of the ridge was formed by Harper and Dixon\ud (1974), who stated that the surface tension gradient balances\ud the viscous shear stress generated in the boundary layer. Experimental\ud studies of the ridge so far include Schlieren visualizations\ud by Sellin (1968) as well as by Scott (1982) who measured\ud the surface slope across the ridge and found good comparisons\ud between the theoretical results of Harper and Dixon. Finally, it\ud was Scott who recognized that even at very low levels of surface\ud contamination the Reynolds ridge is found to exist

Publisher: American Society of Mechanical Engineers
Year: 1996
OAI identifier:
Provided by: Caltech Authors

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