The flow of thin films of Newtonian and non‐Newtonian, Power law fluids down a vertical plate was studied in the laminar and wavy flow regimes.
A theoretical development based on the existence of a steady, periodic solution to the equations describing film flow was used to predict the flow characteristics of the film.
Double logarithmic plots of film thickness versus Reynolds number (ReP. L.) were linear, as predicted, up to a ReP. L. = 100. The ratio of surface to average velocity was found to be approximately independent of the Reynolds number at values predicted by a laminar velocity profile. The wavelength of stable waves was found to be independent of the Reynolds number for a given fluid.
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