Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction

Timmermann, Jens; Hoffmann, Marko; Schlüter, Michael

doi:10.1002/ceat.201600299

Cited by 22 publications

(19 citation statements)

References 28 publications

(23 reference statements)

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“…The fluid flow in single or multiphase systems can be analyzed by various measurement techniques. Field and volume information can be achieved by imaging techniques using tracers, color changes as well as particle image velocimetry (PIV) , , laser‐induced fluorescence (LIF) or tomographic methods including combined solutions such as tomographic PIV , . Single point measurements are possible for example with hot‐wire anemometry, laser‐Doppler velocimetry (LDV) or ultrasound doppler velocimetry .…”

Section: Particle Swarm Characterizationmentioning

confidence: 99%

“…The fluorescence intensity is reduced due to the presence of a second component so that mass transfer or mixing processes can be visualized. It allows for a non-invasive, instantaneous dynamic 2D measurement of concentration (or temperature and pH) in real- time with the limiting factors of material system and laser frequency [32,42,43]. Details on the LIF measurement technique can be found in [25,42,43].…”

Section: Momentum Heat and Mass Transfermentioning

confidence: 99%

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Description of Disperse Multiphase Processes: Quo Vadis?

Hohl

Panckow

Schulz

et al. 2018

Chemie Ingenieur Technik

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The experimental accessibility of disperse systems often is a critical factor when it comes to the development of modeling approaches that intend to converge towards an exact solution. Often, integral or pseudo‐homogeneous values are used to reduce the complexity of the system, but a detailed single particle or interface analysis is crucial to understand relevant effects that also affect the swarm behavior. A high number of experimental techniques with respective limitations and advantages is available to quantify these effects. In this work, an overview on measurement techniques for momentum, heat and mass transfer in particle swarms as well as for the particle size distribution and interface characterization is provided. The industrial applicability is addressed by pointing out the vicinity to the process and the costs of different measurement techniques.

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Section: Particle Swarm Characterizationmentioning

confidence: 99%

Section: Momentum Heat and Mass Transfermentioning

confidence: 99%

Description of Disperse Multiphase Processes: Quo Vadis?

Hohl

Panckow

Schulz

et al. 2018

Chemie Ingenieur Technik

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“…Concerning the influence of confining walls on the mass transfer, see, e.g., Hosoda et al [4]. As an alternative, relations of the Sherwood number and the oscillation frequency can be found [5], such as:…”

Section: )mentioning

confidence: 99%

Mass Transfer in Reactive Bubbly Flows – A Single‐Bubble Study

et al. 2017

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The design of reactors with a dispersed gas in a liquid phase, e.g., bubble columns, is often based on rather roughly estimated parameters. To obtain a better understanding of the influence and interaction of the fluid dynamics and the mass transfer in the presence of a chemical reaction of NO and Fe(EDTA) in the liquid phase, the complex system of a bubbly flow is here reduced to single-bubble investigations. For this purpose, mass transfer is investigated with and without chemical reaction to be able to differentiate between various influencing factors and determined enhancement caused by the chemical reaction. Two experimental setups are applied, namely, the first one with two moving cameras where the velocity is adapted to the rising velocity of the bubble, and the second one is a countercurrent-flow cell.

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“…Bubble‐column reactors play a crucial role in large‐scale industrial processes, such as the Wacker–Hoechst oxidation . Although a considerable amount of research has been invested to understand single bubble phenomena, the interactions of multiple bubbles, and even whole bubble reactors, there is growing interest in understanding the chemical processes in the bubble tail. These processes can be spatially resolved with Magnetic Resonance Imaging (MRI) .…”

Section: Introductionmentioning

confidence: 99%

Imaging of copper oxygenation reactions in a bubble flow

Benders

Strassl

Fenger

et al. 2018

Magnetic Reson in Chemistry

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Reactions of gases with liquids play a crucial role in the production of many bulk chemicals. Often, the gas is bubbled into the chosen reactor. Most of the processes at the gas-liquid interface of the bubbles and in their tails are not fully understood and warrant further investigation. For this purpose, NMR imaging or Magnetic Resonance Imaging has been applied to visualize some of the processes in the bubble tail. To generate sufficient contrast, a magnetogenic gas-liquid reaction associated with a change of magnetic state, from diamagnetic to paramagnetic, was employed. In this work, a copper(I)-based compound was oxidized to copper(II) to exploit relaxation contrast. To match the speed of the rising bubbles to the acquisition time of the spin-echo imaging sequence, polyethylene glycol was added to increase the viscosity of the reacting solution. Images of the oxygen ingress into a static solution as well as of oxygen bubbles rising in the solution are presented. In both cases, changes in magnetism were observed, which reported the hydrodynamic processes.

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Influence of Bubble Bouncing on Mass Transfer and Chemical Reaction

Cited by 22 publications

References 28 publications

Description of Disperse Multiphase Processes: Quo Vadis?

Description of Disperse Multiphase Processes: Quo Vadis?

Mass Transfer in Reactive Bubbly Flows – A Single‐Bubble Study

Imaging of copper oxygenation reactions in a bubble flow

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