Experimental study of gas‐induced liquid‐flow structures in bubble columns

Degaleesan, Sujatha; Duduković, Milorad P.; Pan, Y.

doi:10.1002/aic.690470904

Cited by 193 publications

(135 citation statements)

References 50 publications

(49 reference statements)

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“…Bubble columns are multiphase reactors/contactors which are widely used in chemical and biochemical industry [1][2][3][4]. Especially in biotechnologies, the bubble columns are advantageous due to their low costs and low shear stress hydrodynamics gentle to the microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

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Abstract:The paper presents a brief overview of experiments on volumetric mass transfer coefficient in bubble columns. The available experimental data published are often incomparable due to the different type of gas distributor and different operating conditions used by various authors. Moreover, the value of the coefficient obtained experimentally is very sensitive to the particular method and to the physical models used in its evaluation. It follows that the Dynamic Pressure Method (DPM) is able to provide physically correct values not only in lab-scale contactors but also in pilot-scale reactors. However, the method was not correctly proven in bubble columns. In present experiments, DPM was employed in a laboratory-scale bubble column with a coalescent phase and tested in the pure heterogeneous flow regime. The method was successfully validated by the measurements under two different conditions relevant to the mass transfer. First, the ideal pressure step was compared with the non-ideal pressure step. Second, the pure oxygen absorption was compared with the simultaneous oxygen-and-nitrogen absorption. The obtained results proved that DPM is suitable for measuring the mass transport in bubble columns and to provide reliable data of volumetric mass transfer coefficient.

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Section: Introductionmentioning

confidence: 99%

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

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“…This profile drives, by buoyancy force differences, a single liquid recirculation cell (in a time averaged sense), which is confirmed by CARPT studies. CARPT also provides the axial and radial eddy diffusivities from the Lagrangian tracer trajectories (Yang et al, 1993;Degaleesan et al, 2001). A one-dimensional momentum balance ties the radial gas holdup profile and the liquid recirculation rate.…”

Section: Innovations In Vertical Scaleupmentioning

confidence: 99%

“…To measure the motion of the solids or liquid phase we have introduced computer-assisted single radioactive particle tracking (CARPT) to obtain the Lagrangian trajectories of a single tracer particle (labeled Sc 46) made dynamically similar to the phase being traced (Devanathan et al, 1990;Larachi et al, 1997;Dudukovic et al, 1997;Degaleesan et al, 2001). For monitoring solids motion a particle of the same density and size as the solids used is employed, for liquids a neutrally buoyant particle is used whenever possible.…”

Section: Innovations In Vertical Scaleupmentioning

confidence: 99%

Challenges and Innovations in Reaction Engineering

Duduković

2008

Chemical Engineering Communications

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The importance of reaction engineering in generating a myriad of products on which developed societies depend is outlined. The challenges of a political, economic, and technical nature that need to be addressed in rendering conversion of raw materials into desired products that are more environmentally friendly and sustainable are briefly discussed. It is shown that multiphase reactors are prevalent in all applications, and improvements in the reactor material and energy efficiencies lead to more environmentally benign processes. This requires, in addition to the selection of green process chemistry, systematic implementation of the multi-scale reaction engineering methodology to accomplish proper reactor type selection and scaleup for commercial applications. It is also illustrated that recent innovations in multiphase reaction engineering basically utilize two key concepts: process intensification (e.g., enhancement in mass and heat transfer rates) and simultaneous reaction and separation. Examples of these are discussed, such as micro-reactors, reactive distillation, etc. It is also shown that commercialization of bench-scale discoveries requires either scaleup in parallel or vertical scaleup. New tools for visualization of opaque multiphase flows and development of appropriate rational phenomenological multiphase reactor models for scaleup and design are also briefly discussed.

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“…Bubble column reactors is one of the multiphase reactors that intensively used in chemical, biochemical and metallurgical industries (Degaleesan et al, 2001). In order to have a better understanding on hydrodynamic properties, there are a few important parameters have been reviewing by research group which are bubble characteristics (Essadki et al, 1997), liquid-phase properties, gas distributor, gas holdup studies and flow regime investigations (Ruzicka et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Flow visualization of bubble structure in bubble column reactor for fluid mixing

Ibrahim¹,

Khalid²,

Zaman³

et al. 2017

AIP Conference Proceedings

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Bubble columns reactor is widely used as gas-liquid mixing and as reactors in many industries such as in chemical, petrochemical and biochemical. High interfacial area between the gas and liquid phase will enhanced an effective mixing, leading to improved heat and mass transfer characteristics under bubble columns become an attractive choice as reactors for the described processes. In this research, experimental work by using cylindrical acrylic bubble column with internal diameter of 0.15m and height of 1m was done. The bubble column is equipped by four nozzles with orifice diameter of 5 mm function as gas distributor attach at the bottom of the column. For this study, gas phase and liquid phase used are air and water respectively. The investigated variable parameter was mechanism of bubble formation, regime analysis and the relationship between superficial gas holdup and gas holdup. The techniques used in collecting data were visual observation, measurement technique and photographic method. The result showed that there were five stage of bubble formation based on experiment conducted. For gas holdup and superficial gas velocity relationship, it was discovered that the gas holdup increased with the increasing of superficial gas velocity. The relationship was proof to be in good agreement with published data proposed by previous researcher. .

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Experimental study of gas‐induced liquid‐flow structures in bubble columns

Abstract: Menzel et al. 1990 .

Cited by 193 publications

References 50 publications

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

Challenges and Innovations in Reaction Engineering

Flow visualization of bubble structure in bubble column reactor for fluid mixing

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