1B46 正方形断面の円周方向溝を有する管路内における間欠振動流の可視化

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  • 1B46 Visualization of Intermittent Oscillatory Flow in Pipes with Circumferential Grooves of Square Cross Section

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The maximum velocity of intermittent oscillatory flow in a pipe with circumferential grooves is greater than sinusoidal oscillatory flow in a straight pipe. Visualization of intermittent oscillatory flow of water in a pipe with circumferential grooves of several aspect ratios has been carried out on conditions of several frequencies and tidal volume of 80[mL]. In the present paper, ensemble averages of each time from the lower dead point to the upper dead point for flow velocity distributions of intermittent oscillatory flow through pipes with circumferential grooves of different aspect ratio were measured. Maximum velocity did not necessarily increased in the pipe with circumferential grooves of aspect ratio of 1.Maximum axial velocity in a pipe with circumferential grooves of aspect ratio of 0.5 was almost similar to the other pipes, but the maximum radial velocity of aspect ratio of 0.5 was larger than the other pipes.

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