Gepackte Aufstrom‐Blasensäulen

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Abstract
Packed upflow bubble columns. Packed upflow bubble columns are used in the chemical industry, in biotechnology, and in waste‐water purification. They are usually operated in the co‐current mode and have various advantages, but also disadvantages, compared with empty bubble columns. This survey reports the current state‐of‐the‐art in fluid dynamics (flow states, pressure drop, holdup and dispersion, bubble size and bubble rise velocity, interfacial area), mass and heat transfer (mass transfer coefficients at the gas/liquid and liquid/solids interface, heat transfer coefficients for fluid/solids and fluid/wall interfaces, effective thermal conductivity of the bulk solids through which flow occurs), flow models (continuum models, stage models, zone models), and other aspects of this type of multiphase reactor; gaps in our knowledge are also indicated.