Abstract
Patterns formed by the flow of an inhomogeneous fluid (suspension) over a smooth inclinedsurface were studied. It was observed that fractal patterns form. There exists a thresholdangle for the inclination above which global fractal patterns are formed. This angle dependson the particle size of the suspension. We observed that there are two fractal dimensions forthese patterns, depending on the area from which the pattern is extracted. If thepattern is taken from the top which only consists of the beginning steps of thepattern forming, one finds two fractal dimensions, i.e. 1.35–1.45 and 1.6–1.7, inwhich the first one is dominant while, if the entire pattern is taken, then a fractaldimension 1.6–1.7 is observed. The first fractal dimension belongs to the class of theflow of water over an inhomogeneous surface and the second one corresponds tothe river network. This may imply that both universality classes are present.However, here disorder is present in the fluid and is transferred to the surface.
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