Bubble Columns

Abstract

The article contains sections titled: 1. Introduction 2. Bubble Columns 2.1. Design and Applications 2.2. Gas Distribution 2.3. Flow Regimes 2.4. Bubble Size 2.5. Bubble Rise Velocity 2.6. Axial Dispersion 2.7. Gas Holdup 2.8. Specific Interfacial Area 2.9. Mass Transfer 2.10. Heat Transfer 2.11. Fluid Dynamics 3. Airlift Loop Reactors 3.1. Design and Applications 3.2. Mixing Behavior and Fluid Dynamics 3.3. Gas Holdup 3.4. Mass Transfer and Mixing 3.5. Heat Transfer 3.6. Computational Fluid Dynamics

Einfluss der Genauigkeit der Reaktionskinetik auf die simulationsgestützte Auslegung von Blasensäulen

“…Die Auslegung und Optimierung industrieller Blasensäulen stellt aufgrund der geringen Datenlage für reale, in der Regel organische Stoffsysteme, hinsichtlich der komplexen fluiddynamischen Phänomene immer noch eine Herausforderung dar . Die Komplexität der Fluiddynamik zeichnet sich zum einen durch die makroskopische Durchmischung der Phasen und zum anderen durch lokale Zirkulationsströmungen aus . Nicht zuletzt ist bei der Beschreibung von Blasensäulen die Wechselwirkung zwischen Fluiddynamik, Stoffübergang und Reaktion zu berücksichtigen.…”

Characterization of a Raman Spectroscopic and Holographic System for Gas‐Liquid Flows in Microchannels

“…Since the 1970s, great efforts have been made to improve knowledge about the flow phenomena and the related selectivity and yield of the reaction products in gas-liquid reactors in order to intensify such processes. However, a realistic description and prediction of industrially relevant reactive bubbly flows is, until now, a challenge [1][2][3].…”

Simultaneous in situ characterisation of bubble dynamics and a spatially resolved concentration profile: a combined Mach–Zehnder holography and confocal Raman-spectroscopy sensor system

“…The main application of gas dispersion in industry is to transfer gas into liquid, for instance in order to run a chemical reaction (Deen et al, 2012;Jakobsen, 2008). In the chemical industry, bubble columns are a widely used tool, especially for reactions that require a large liquid hold-up and long liquid-phase residence times without the need for a narrow residence time distribution (Deckwer, 1992;Deen et al, 2012;Jakobsen, 2008).…”

“…In the chemical industry, bubble columns are a widely used tool, especially for reactions that require a large liquid hold-up and long liquid-phase residence times without the need for a narrow residence time distribution (Deckwer, 1992;Deen et al, 2012;Jakobsen, 2008). However, a realistic description and prediction of industrially relevant reactive bubbly flows has been a challenge until now (Deckwer, 1992;Deen et al, 2012;Jakobsen, 2008). Thus, the complex problem is scaled down to single bubbles and bubble chains in order to gain insight into the processes of hydrodynamics and mass transfer in reactive two-phase flows and how they influence the conversion and selectivity of the desired products.…”