Turbulence Charactristics of Gas-Solids Two-Phase Confined Jet (Effect of Particle Density)

概要

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The effect of solid particles on the flow structure of a confined jet was experimentally investigated. Spherical glass particles and light hollow glass particles with almost the same size of 60-80μm were loaded for a constant volume fraction. The confined jet flowed at a jet outlet Reynolds number of 2.2×10<SUP>4</SUP> in gravitational direction without a recirculating flow. A laser Doppler velocimeter system capable of particle size discrimination was used to measure both two-component velocities of gas and particles, and their fluctuations. The measured results indicate that the rate of flow development of jet decreased in the two-phase flow and that turbulence intensities of gas phase are reduced by loading particles. Reynolds shear stress and production rate of turbulent energy decreased over the entire cross-sectional area. It was confirmed that heavy particles contributed to the strong reduction of turbulent motion of gas phase.
日本混相流学会の論文