MASS TRANSFER COEFFICIENTS FOR SUSPENDED PARTICLES IN AGITATED VESSELS AND BUBBLE COLUMNS

[摘要] References(24)Cited-By(120)Mass transfer coefficients of suspended particles were measured in agitated vessels and in bubble columns. Four sizes of agitated vessels (diameter: 9.5, 17.5, 20, 40 cmØ) including both fully baffled and non-bafHed conditions and two sizes of bubble columns (diameter: 10, 20cmØ) were used. Particle sizes ranged from 60 to 1100 μØ including both spherical beads (ion exchange resin) and granules (benzole acid, KMnO4, and β-naphthol). We correlated the mass transfer coefficients using the surface factor as Sh=[2+0.4(εdp4/ν3)1/4•Sc1/3]•φcwith a standard deviation of 30.8% for the Sherwood number. Sh[-]: Sherwood number, e [cm2/sec3]: rate of energy dissipation, dp [cm]: specific surface diameter, v [cm2/sec3]: kinematic viscosity, Sc [-]: Schmidt number and Øc [-]: surface factor.