低レイノルズ数オリフィス流れの圧力回復特性に関する実験的考察

概要

論文の詳細を見る
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.
一般社団法人日本機械学会の論文
1985-07-25