The Influence of Facets Within the Inlet Edge of Cylindrical Probe on the Discharge Coefficient

Using a special optical microscope an analysis was performed for the geometry of the inlet edge using the research models of cylindrical caps. The presence of chamfer on the inlet edge of all models of cylindrical caps was revealed. The graphs of a change of flow coefficient determined for an area which corresponds to the outer diameter of the chamfer as the function vs Reynolds number were experimentally obtained. The fact that in this case the values of the flow coefficients of all investigated cylindrical caps are in good agreement with the value of this coefficient for holes in a thin wall was obtained from the analysis of these graphs. Research results allowed explaining the mechanism of influence of chamfer on the hydrodynamic characteristics of liquid outflow from caps.

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