Abstract
The present paper deals with an experimental review of orifice flows in oil hydreulic lines. Pressure differences were measured between two separated points on a tube wall downstream of an orifice. Unexpectedly an abrupt vanishment of pressure recovery was observed under a specified rate of flow. Measurement of continuous pressure recovery profiles revealed that this 'vanishment' resulted from an unknown phenomenon which characterizes orifice flows of low Reynolds number; the pressure recovery region starts to remove downstream when Reynolds number falls below a critical value, and it drifts away farther from the orifice as Reynolds number decreases. The critical Reynolds number becomes smaller for a greater enlargement ratio of an orifice. Perplexingly it also varies with the line pressure.
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