Ultrasonic Doppler Measurements of Bubble Velocities in Bubble Columns

Luebbert, A.; Korte, Thomas; Schuegerl, K.

doi:10.1007/978-3-642-82112-7_24

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…[5] In order to determine bubble size and velocity, there are already several measurement techniques available based on conductivity, electro-optics, and photo-optics as well as ultrasound. [3,4] Well established are, for example, needle probes that use the time difference between signals (impedance, conductivity, light reflection) caused by the bubble interface if the bubble is penetrated by the needle. Despite the fact that this is a very fast and universal opportunity to get information about bubble sizes and velocities, the position of the penetration through the bubble is unknown and therefore the accuracy is limited.…”

Section: The State Of the Artmentioning

confidence: 99%

“…In order to determine bubble size and velocity, there are already several measurement techniques available based on conductivity, electro‐optics, and photo‐optics as well as ultrasound . Well established are, for example, needle probes that use the time difference between signals (impedance, conductivity, light reflection) caused by the bubble interface if the bubble is penetrated by the needle.…”

Section: The State Of the Artmentioning

confidence: 99%

“…Despite frequent application, the complex flow conditions and the enormous number of coupled parameters, such as gas and liquid velocity, as well as bubble diameter and velocity, which determine the mass transfer between the liquid and gaseous phase, are still hardly predictable . Although there are measurement techniques available based on conductivity, electro‐ and photo optics, as well as ultrasound it is difficult to gain information about bubble diameter and velocity of bubbly flows with relevance for industrial use. One of the reasons for this is the lack of measurement techniques applicable under industrial conditions, in other words organic solvents under higher pressure and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Bubble size and bubble velocity distribution in bubble columns under industrial conditions

et al. 2017

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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.

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Section: The State Of the Artmentioning

confidence: 99%

Section: The State Of the Artmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bubble size and bubble velocity distribution in bubble columns under industrial conditions

et al. 2017

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Meßtechnik zur Charakterisierung von Gas/Flüssigkeits‐Reaktoren

Schügerl

Lübbert

Korte

et al. 1985

Chemie Ingenieur Technik

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Measuring techniques for characterizing gas/liquid reactors. The article considers measuring techniques for the characterization of the phases in gas/liquid reactors. These include the velocity profile and turbulence in the continuous phase as well as holdup, size, and velocity of the dispersed phase. Also, methods for the determination of the specific interfacial area and the volumetric mass transfer coefficients are discussed. Measuring methods have made enormous advances in recent years. In spite of this, there is a lack of reliable methods, especially for use during reactions without disturbing the state of the reactor. It is suspected that probe technique will gradually fall into disuse and more and more attention will be focussed on contractless methods. This calls for further development of ultrasonic methods and methods relying on emission of light.

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Messung von Blasengeschwindigkeiten in Bioreaktoren mit Hilfe eines Ultraschallimpuls‐Doppler‐Anemometers

Korte

Lübbert

1985

Chemie Ingenieur Technik

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Ultrasonic Doppler Measurements of Bubble Velocities in Bubble Columns

Cited by 8 publications

References 3 publications

Bubble size and bubble velocity distribution in bubble columns under industrial conditions

Bubble size and bubble velocity distribution in bubble columns under industrial conditions

Meßtechnik zur Charakterisierung von Gas/Flüssigkeits‐Reaktoren

Messung von Blasengeschwindigkeiten in Bioreaktoren mit Hilfe eines Ultraschallimpuls‐Doppler‐Anemometers

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