Particle Tracking Velocimetry zur detaillierten Erfassung der Hydrodynamik in Blasensäulen

Borchers, Oliver; Eigenberger, Gerhart

doi:10.1002/1522-2640(200205)74:5<648::aid-cite1111648>3.0.co;2-c

Cited by 4 publications

(6 citation statements)

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“…Unfortunately!, the question as to whether the resistance of a gas bubble in the swarm is higher or lower than that of a single rising bubble is still largely unresolved (Schlueter and Raebiger, 1998). Recent experimental evidence of Borchers (2002) supports a correlation of Richardson and Zaki (1954), which—in accord with physical intuition—suggests an increase of the resistance with increasing gas holdup.…”

Section: Modeling Of the Gas Velocitysupporting

confidence: 58%

“…Direct numerical simulation (DNS) of a flow of bubble clusters using continuum equations! (Tryggvason et al, 1998) or a lattice Boltzmann approach (Shan and Chen, 1993) in combination with detailed flow visualization experiments which simultaneously show the dynamics of bubbles and the surrounding liquid (Borchers, 2002) are required to develop reliable models on this detailed level. After verification, they can be used to provide a well based description of the turbulent interaction phenomena, presently missing in the volume averaging two‐fluid models.…”

Section: Discussionmentioning

confidence: 99%

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Simulation of buoyancy driven bubbly flow: Established simplifications and open questions

2004

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Section: Modeling Of the Gas Velocitysupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Simulation of buoyancy driven bubbly flow: Established simplifications and open questions

2004

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“…In recent years, methods of pulse-light velocimetry (PLV), such as particle image velocimetry (PIV) and particle tracking velocimetry (PTV), have been developed and applied to bubbly flows (e.g. Borchers et al 1999, Delnoij et al 1999, Brücker 2000, Deen et al 2000, Lindken et al 2000, Fujiwara et al 2001, Hassan et al 2001, Bröder and Sommerfeld 2001, Honkanen et al 2005. Essential for a reliable and simultaneous velocity measurement of both phases (i.e.…”

Section: Introductionmentioning

confidence: 99%

Planar shadow image velocimetry for the analysis of the hydrodynamics in bubbly flows

Bröder¹,

Sommerfeld²

2007

Meas. Sci. Technol.

127

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In order to allow for more reliable modelling of microscale processes in turbulent bubbly flows, detailed experiments in a laboratory-scale double loop facility and a bubble column with a diameter of 140 mm were performed. The range of bubble mean diameters considered in the measurements was between 2 and 4 mm. The average gas volume fraction was in the range between 0.5 and 5% for different experiments. To allow simultaneous measurements of bubble size, bubble velocity and liquid velocity field, a combined system of planar shadow imaging, particle tracking velocimetry (PTV) and particle image velocimetry (PIV) for online measurements was developed and applied. The measurements of the liquid phase velocities were realized by seeding the flow with polyamide tracer particles having a mean diameter of 65 μm. A background illumination was established by using an array of 551 LEDs with a size of 160 mm by 100 mm. A double image CCD camera with macro optics was used to record the images of tracers and bubbles simultaneously. Because of the small depth of field of the macro camera optics (<4 mm for the bubbles), it was possible to discriminate between bubbles and tracer particles inside and outside the camera's focal plane using the gradient of grey values. A set of digital image filters was applied to perform phase discrimination between bubbles and tracer particles, i.e. to obtain separate double images for bubbles and tracer, respectively. The contour of in-focus bubbles was determined using an edge detecting Sobel filter and a spline interpolation technique. Thereby, the bubble size, shape and orientation could be derived. The bubble velocity was obtained by applying PTV and the continuous phase velocity field was determined by PIV, using a successive refinement of the interrogation area. By recording and evaluating at least 500 double images, it was possible to determine bubble size distributions and mean as well as fluctuating velocities for both phases. Thereby, detailed data on the hydrodynamics of bubble-driven flows are provided.

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“…A similar study for tracking bubbles is reported in [6]. The author developed a PTV (Particle Tracking Velocimetry) system based on image processing techniques.…”

Section: Introductionmentioning

confidence: 90%

Template-based bubble identification and tracking in image sequences

Cheng

Burkhardt

2006

International Journal of Thermal Sciences

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Particle Tracking Velocimetry zur detaillierten Erfassung der Hydrodynamik in Blasensäulen

Cited by 4 publications

References 0 publications

Simulation of buoyancy driven bubbly flow: Established simplifications and open questions

Simulation of buoyancy driven bubbly flow: Established simplifications and open questions

Planar shadow image velocimetry for the analysis of the hydrodynamics in bubbly flows

Template-based bubble identification and tracking in image sequences

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