固液二相矩形管内流の乱流構造 : 第1報, DPIVによる流れ場の測定

概要

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The interactions between dispersed particles and fluid turbulence have been investigated in a fully-developed water channel. Particle velocities and fluid velocities in the presence of 340μm and 500μm glass beads, and 420μm cellulose particles were measured by digital particle image velocimetry (DPIV). These particles were comparable to or slightly greater than the Kolmogorov lengthscale of the flow (320μm). Although there was no apparent modification to the mean flow, an increase in turbulence intensities was greater in the streamwise than in the transverse direction, due to an increase in the turbulence energy in the streamwise direction. Particle concentration fluctuation increased the turbulence energy in the low-wave-number region, which means that the turbulence was modified by preferentially concentrated particles.
1996-01-25