Application of a 4-point optical probe to a Slurry Bubble Column Reactor

Manjrekar, Onkar N.; Duduković, Milorad P.

doi:10.1016/j.ces.2015.03.027

Cited by 28 publications

(19 citation statements)

References 38 publications

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“…It is contradictory when compared with its effect on the bubble diameter (see Figure c), where the coalescence rate is enhanced. It should be noted that the particle diameter utilized in this study is relatively large (Stokes number >1); thus, the interaction between bubbles and particles is dominant, even though the bubbles intend to coalesce with an increase of solids, and the kinetic energy of bubbles is reduced . In addition, the decrease of bubble velocity near the wall at higher C s is more rapid, which further verifies the interaction effect of large particles with bubbles.…”

Section: Resultssupporting

confidence: 53%

“…Non‐invasive techniques, such as dynamic gas disengagement and the photographic technique, like the endoscope technique, are limited because of some ineluctable hypotheses or strict measuring conditions, such as the requirement of a quasi‐2D apparatus, although they could be the “standard” against other techniques. Hence, the invasive techniques, like needle probes, are preferred for bubble behavior studies, such as those that investigate local gas holdup, bubble frequency, bubble velocity, and bubble diameter . In a system containing solid particles, the optical‐based techniques, such as the focused beam reflectance method, are more practical than other needle probes that pierce bubbles when the wear extent is considered.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Gao

et al. 2019

AIChE Journal

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Multiphase flow hydrodynamics in a novel gas–liquid–solid jet‐loop reactor (JLR) were experimentally investigated at the macroscales and mesoscales. The chord length distribution was measured by an optical fiber probe and transformed for bubble size distribution through the maximum entropy method. The impacts of key operating conditions (superficial gas and liquid velocity, solid loading) on hydrodynamics at different axial and radial locations were comprehensively investigated. JLR was found to have good solid suspension ability owing to the internal circulation of bubbles and liquid flow. The gas holdup, axial liquid velocity, and bubble velocity increase with gas velocity, while liquid velocity has little influence on them. Compared with the gas–liquid JLRs, solids decrease the gas holdup and liquid circulation, reduces the bubble velocity and delays the flow development due to the enhanced interaction between bubbles and particles (Stokes number >1). This work also provides a benchmark data for computational fluid dynamics (CFD) model validation. © 2019 American Institute of Chemical Engineers AIChE J, 65: e16537, 2019

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Section: Resultssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Experimental investigation on multiscale hydrodynamics in a novel gas–Liquid–Solid three phase jet‐Loop reactor

Gao

et al. 2019

AIChE Journal

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“…In addition, e.g., a thermocouple can be implemented inside the measuring electrode for temperature detection . By using technical extensions, precise measurements both in multiphase flows and under high pressure are possible . A further development is a needle probe with multiple tips, which allow a more precise measurement.…”

Section: Measurement Methodsmentioning

confidence: 99%

Particle Measurement Techniques in Fluid Process Engineering

Lichti

Bart

2018

ChemBioEng Reviews

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Droplets, bubbles, or solid particle concentrations and their particle size distributions markedly influence the process conditions. In this article, an overview with respect to popular invasive and non‐invasive local measurement techniques for bubbles and droplets will be given. It starts with capillary suction probes, laser Doppler anemometry and finally covers actual developments in tomography and optical endoscopic measurement techniques. Furthermore, the possibilities and limitations of analyzing particle size distributions with these different methods in various application fields will be discussed.

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“…Presently no theory is available for a priori prediction of the local bubble dynamic quantities, and their spatial distribution in the vessel of interest. Optical probes have been used successfully to study bubble dynamics in air-water systems, columns with vertical cooling internals and suspended solids (Hamed, 2012;Manjrekar and Dudukovic, 2015;Wu, 2007;Youssef et al, 2013). In this work we extend the application of optical probes to photobioreactors.…”

Section: Introductionmentioning

confidence: 97%