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TURBULENCE MODIFICATION OF GAS-LIQUID-SOLID DISPERSED THREE-PHASE FLOW IN A VERTICAL PIPE
Kobe City College of Technology, 8-3 Gakken-Higashi, Nishi, Kobe, 651-2194,
Department of Mechanical Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
Turbulence modification due to bubbles or particles is an important issue in accurate numerical prediction and modeling of dispersed multiphase flows. Although many studies have been carried out to understand turbulence modification due to bubbles or particles, there are few studies on turbulence modification in gas-liquid-solid dispersed three-phase flow. In the present study, the liquid velocities of dispersed three-phase flows in a vertical pipe (30.3 mm i.d.) were measured by a laser Doppler velocimetry system. The bubble diameters ranged from 2 to 8 mm and three kinds of particles with different diameters (1.45,3.19, and 4.16 mm) were used as the solid phase. The effects of the addition of solid particles and bubbles on the radial profiles of the mean liquid velocities and root-mean-square (RMS) values of the fluctuating velocity were examined. The area-averaged RMS values were calculated to quantitatively discuss turbulence modification due to the addition of bubbles and particles. As a result, it was found that there is a case in which the intensity of the fluctuating velocity is attenuated by adding bubbles to the liquid-solid two-phase flow. The eddy viscosity ratio is applicable in correlating the turbulence modification not only in liquid-solid and gas-liquid two-phase flows but also in dispersed three-phase flows.
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