Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Guo, Kunyu; Wang, Tiefeng; Yang, Gaoyuan; Wang, Jinfu

doi:10.1002/jctb.5022

Cited by 23 publications

(18 citation statements)

References 44 publications

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“…Similar results were presented by Syeda et al [165] and by Shah et al [161]. These studies [161,[164][165][166] explain the trend of ε G with respect to the mole fraction of one of the two components in the liquid mixture, based on the model proposed by Andrew [167].…”

Section: R4supporting

confidence: 78%

“…Pjoteng et al [125] (d c = 0.10 m, H C = 1.8 m) reported an increase in ε G with the addition of ethanol (0.5% wt ), up to a pressure of 9 MPa. Guo et al [164] studied a small diameter (d c = 0.1 m) and small-scale (H c = 1.8 m) bubble column. They found that ε G first increases, and then decreases, with an increasing ethanol concentration, owing to the non-linear effect of the alcoholic solution on the "coalescence-induced" and "non-coalescence-induced" bubbles.…”

Section: R4mentioning

confidence: 99%

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Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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Section: R4supporting

confidence: 78%

Section: R4mentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…Guo et al (2016) studied a small-diameter (d c =0.1 m) and small-scale (H c =1.8 m) bubble column by using nitrogen as the gas phase and various solutions of ethanol and nbutanol as the liquid phase. They found that the gas holdup first increases rapidly, and then decreases slowly when further increasing the ethanol concentration.…”

Section: Comparison With the Dual Effect Observed In Binary Systems Wmentioning

confidence: 99%

“…A similar result was presented by Shah et al (1985), who investigated the entire range of concentrations for the ethanol-water system. All these studies (Bhaga et al, 1971;Guo et al, 2016;Shah et al, 1985;Syeda et al, 2002) explained the trend of the gas holdup with respect to the mole fraction of one of the two components in the liquid mixture on the basis of the dynamic surface tension model by Andrew (1960).…”

Section: Comparison With the Dual Effect Observed In Binary Systems Wmentioning

confidence: 99%

The dual effect of viscosity on bubble column hydrodynamics

Besagni

Inzoli

Guido

et al. 2017

Chemical Engineering Science

110

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A B S T R A C TSome authors, in the last decades, have observed the dual effect of viscosity on gas holdup and flow regime transition in small-diameter and small-scale bubble columns. This work concerns the experimental investigation of the dual effect of viscosity on gas holdup and flow regime transition as well as bubble size distributions in a large-diameter and large-scale bubble column. The bubble column is 5.3 m in height, has an inner diameter of 0.24 m, and can be operated with gas superficial velocities in the range of 0.004-0.20 m/s. Air was used as the dispersed phase, and various water-monoethylene glycol solutions were employed as the liquid phase. The water-monoethylene glycol solutions that were tested correspond to a viscosity between 0.9 mPa s and 7.97 mPa s, a density between 997.086 kg/m 3 and 1094.801 kg/m 3 , a surface tension between 0.0715 N/m and 0.0502 N/m, and log 10 (Mo) between −10.77 and −6.55 (where Mo is the Morton number). Gas holdup measurements were used to investigate the global fluid dynamics and the flow regime transition between the homogeneous flow regime and the transition flow regime. An image analysis method was used to investigate the bubble size distributions and shapes for different gas superficial velocities, for different solutions of watermonoethylene glycol. In addition, based on the experimental data from the image analysis, a correlation between the bubble equivalent diameter and the bubble aspect ratio was proposed. The dual effect of viscosity, previously verified in smaller bubble columns, was confirmed not only with respect to the gas holdup and flow regime transition, but also for the bubble size distributions. Low viscosities stabilize the homogeneous flow regime and increase the gas holdup, and are characterized by a larger number of small bubbles. Conversely, higher viscosities destabilize the homogeneous flow regime and decrease the gas holdup, and the bubble size distribution moves toward large bubbles. The experimental results suggest that the stabilization/destabilization of the homogeneous regime is related to the changes in the bubble size distributions and a simple approach, based on the lift force, was proposed to explain this relationship. Finally, the experimental results were compared to the dual effect of organic compounds and inorganic compounds: future studies should propose a comprehensive theory to explain all the dual effects observed.

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“…S8). The bubble inrush phenomenon observed from the micrometer orifice (Figs and ) induces a significant fluctuation near the bubble interface and then directly affects the formation of the following bubbles, leading to the enhancement of the volumetric mass transfer coefficient K L a . Obviously, the increase of K L a becomes more remarkable when bubbling via the orifice with smaller diameter, which indicates that the orifice gas velocity makes an apparent positive impact on K L a , especially for bubbling from the orifice with smaller diameter.…”

Section: Resultsmentioning

confidence: 99%

Bubble dynamics and mass transfer characteristics from an immersed orifice plate

Shi

Jiang

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Bubble dynamics plays an important role in performance enhancement of multiphase reactor. The formation of the bubbles at the orifice is critical for the dynamics of bubbles and the mass transfer process during the rising stage. However, few studies have focused on the detailed changing characteristic of bubble formation and its relationship with mass transfer.RESULTS: The evolution of the bubble dynamics from millimeter to micrometer-sized immersed orifice plates is in situ visualized. Bubble inrush is observed from the orifices with diameters below 421 ∼m, resulting in significant fluctuation on the gas-liquid interface. The base of the leading bubble varies with the orifice diameter. Smaller orifice is preferred to produce more trailing bubbles with smaller size. The inrush time of the trailing bubble is prolonged with decreasing orifice diameter and increasing gas velocity. The inrush time and diameter of the latter trailing bubble are higher than the former at a certain gas velocity. The volumetric mass transfer coefficient (K L a) is obtained by measuring the bubble volume during the rising process using chemical absorption of carbon dioxide (CO 2 ) with sodium hydroxide (NaOH). Increasing gas velocity, decreasing orifice diameter and bubble inrush make an apparent positive impact on the K L a.CONCLUSIONS: The bubble inrush happens at micrometer orifice. Decreasing orifice diameter and increasing gas velocity are important to intensify oscillation of the leading bubble and increase the frequency of bubbles with high specific interfacial area, which are conducive to the enhancement of the volumetric mass transfer coefficient.

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Distinctly different bubble behaviors in a bubble column with pure liquids and alcohol solutions

Cited by 23 publications

References 44 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

The dual effect of viscosity on bubble column hydrodynamics

Bubble dynamics and mass transfer characteristics from an immersed orifice plate

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