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Item type:Publication, Access status: without files , Bubble size and bubble velocity distribution in bubble columns under industrial conditions(Wiley, 2017-01-19); ; ; ; Bubble column reactors are widely used in many industrial applications due to their simplicity and safety of operation. Despite these advantages, the design and scale-up of bubble column reactors is still challenging especially for industrial conditions at elevated pressure and temperature. One reason is the uncertainties concerning the specific interfacial area which is directly dependent on the bubble size distribution, bubble velocity, and gas hold-up. All these parameters are difficult to measure under industrial conditions due to the opaqueness of the bubbly flow and the safety risks of using organic solvents at elevated pressures and temperatures. This article introduces endoscopic bubble image velocimetry, a new measuring method that enables the detection of bubble sizes and bubble velocities in organic solvents at elevated pressure and temperature (pmax= 1.85 MPa and Tmax = 70 °C) for maximal gas hold-ups of 16 %. For this system it becomes evident that the bubble size distribution for low superficial gas velocities is almost unaffected by pressure and temperature, whereas the bubble velocity decreases slightly.Publicationtype: Journal Article141 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Bubble columns operated under industrially relevant conditions - Current understanding of design parameters(2015-04-04); ; ; ; Despite the fact that bubble columns are widely established within the process industry as multiphase reactors and gas-liquid contactors, common research has been focused on the description of bubble column hydrodynamics under atmospheric conditions. Industrial production is usually conducted at pressures above atmospheric and temperatures above ambient in processes primarily involving the use of organic solvents. Because hydrodynamic parameters such as gas holdup and backmixing determine the necessary reactor design and impact reactor performance, detailed knowledge of these variables is crucial for optimal design and operation of bubble column reactors. The purpose of this article is to give an overview of research studies that deal with bubble column hydrodynamics at elevated pressures. A recommendation for further research concerning this topic is provided as well.Publicationtype: Journal Article40