SHARP EDGE ORIFICE DASHPOT TIMER
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Abstract
THE DASHPOT TIMER OF THIS INVENTION INCLUDES A SUBSTANTIALLY CYLINDERICAL GLASS TUBE IN WHICH TRAVELS A PISTON HAVING A DIAMETER SLIGHTLY LESS THAN THAT OF THE INTERIOR OF THE TUBE. A LOW VISCOSITY LIQUID DEFINES THE MEDIUM IN THE CYLINDER IN WHICH THE PISTON CONTAINING A SHARP EDGE ORIFICE IS ADAPTED TO TRAVEL. THE FLOW INGHENERATED IN THE CYLINDER IS PREDOMINANTLY AN INERTIAL FLOW THROUGH THE SHARP EDGE ORIFICE WITH THE SHEAR FLOW AND PRESSURE FLOW BETWEEN THE PISTON AND CYLINDER BEING RELATIVELY INSIGNIFICANT. THE DEVICE OF THE PRESENT INVENTION OPERATES IN THE INERTIAL FLOW REGION WHEREBY THE VISCOSITY EFFECTS ARE RELATIVELY SMALL COMPARED WITH THE INERTIAL EFFECTS OF THE FLUID.
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