噴流層における最小噴流化速度と最大圧力降下

概要

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Empirical equations of the minimum spouting velocity and the peak pressure drop of spouted beds were obtained on the basis of dimensional analysis of the governing equations. The results indicate that both the dimensionless minimum spouting velocity and the peak pressure drop depend on four dimensionless parameters. The experiments were made by using three flat -bottom cylindrical vessels with diameters of 10, 15 and 20cm, five different nozzles of 5 to 30mm in diameter, and nine glass spheres of 0.924.95mm in diameter as a spouting material. The bed height was varied from 20 to 50cm. Fluids used were air, water and an aqueous solution of sucrose. Viscosity ranged from 1.90×10<SUP>-5</SUP> to 4.64×10<SUP>-2</SUP> Pa·s. The experimental result shows that minimum spouting velocity varies with particle diameter to the power of 1, nozzle diameter to the power of 1/3, bed height to the power of 1/2 and viscosity to the power of -1/2. The peak pressure drop is independent of particle diameter and viscosity, but varies with nozzle diameter to the power of 1/3 and bed height to the power of 3/2.
社団法人化学工学会の論文