Bubble properties and pressure fluctuations in pressurized bubble columns

Kang, Yong; Cho, Y.J.; Woo, Kwang-Jae; Kim, K.I.; Kim, S.D.

doi:10.1016/s0009-2509(99)00336-x

Cited by 63 publications

(27 citation statements)

References 21 publications

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“…An increase in pressure results in a decrease in bubble size (d b ) [1], and some authors have reported a decreased bubble velocity and an increased number of bubbles [87,98,272]. The multiple effects of pressure were also found by Jiang et al [178], who observed a plateau for ε G at approximately 10 MPa and a plateau for bubble diameter at approximately 1.5 MPa; this suggests that pressure has another effect that decreases bubble diameter.…”

Section: Pressurementioning

confidence: 82%

“…An increase in pressure stabilizes the homogeneous flow regime [2,20,56,[84][85][86][87][88][89][90][91][92][93][94][95][96]. Indeed, increasing the pressure increases the break-up rate and reduces the coalescence rate: the new equilibrium between coalescence/break-up leads to a decrease in the bubble size and delays the appearance of large bubbles.…”

Section: Pressure and Temperaturementioning

confidence: 99%

“…It is generally admitted that-in the homogeneous flow regime-d b increases [156] and, after the transition, "coalescence induced" bubbles appear, whereas the contribution of the "non-coalescence induced" bubbles remain constant [18]. Some authors reported an increase in d b with superficial gas velocity, both in the homogeneous and heterogeneous flow regimes [35,38,85,87,127,183,[232][233][234][235][236][237][238][239], while other authors reported no effect of U G over d b [188,240] and some others reported a decrease in the bubble size [241]. In the literature, both unimodal [239] and bimodal [242][243][244][245] BSD have been found depending on the gas sparger design and operating conditions.…”

Section: Superficial Gas Velocitymentioning

confidence: 99%

See 2 more Smart Citations

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: Pressurementioning

confidence: 82%

Section: Pressure and Temperaturementioning

confidence: 99%

Section: Superficial Gas Velocitymentioning

confidence: 99%

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Two-Phase Bubble Columns: A Comprehensive Review

2018

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“…Le coefficient de dispersion radiale de la phase liquide augmente avec l'augmentation de procedure was within 5%, which was depicted by means of probability density function. The bubble chord length and rising velocity have been calculated from the relationship between the reformed and digitized probe signals and the bubble dwell and lag times (Yu and Kim, 1988;Kang et al, 2000).…”

Section: Methodsmentioning

confidence: 99%

Radial Liquid Dispersion and Bubble Distribution in Three‐Phase Circulating Fluidized Beds

et al. 2003

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“…This combination of sampling rate and length ensured that the full spectrum of signals indicating a statistically stationary fl uidized bed state was captured. 5,16,19,[26][27][28][29] From the data of pressure fl uctuations in a given operating condition, the cross-correlation function of the data was obtained by means of Eq. 1, from which the velocity of the fl uctuation waveform was calculated by means of Eq.…”

Section: Kolmogorov Entropymentioning

confidence: 99%

Analysis of gas flow behavior in an annular fluidized-bed reactor for polystyrene waste treatment

Son

Kim

Shin

et al. 2009

J Mater Cycles Waste Manag

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The characteristics of bubble properties and the chaotic fl ow behavior of gas were investigated in an annular fl uidized bed (0.102 m in inner diameter and 2 m in height) because the behavior of gas fl ow in such a reactor is one of the important factors governing reactor operation, reactor performance, and the reaction itself. Pressure fl uctuations as a state variable for the analysis of gas fl ow behavior were measured and analyzed. Bubble properties were determined by adopting the cross-correlation function of pressure fl uctuations. The resultant chaotic fl ow behavior of gas was interpreted by means of chaotic parameters such as the Kolmogorov entropy. It was found that the Kolmogorov entropy could be utilized effectively to explain the nonlinear dynamic behavior of gas-solid fl ow in the annular fl uidized bed. The pierced length and rising velocity of bubbles increased with increasing gas velocity, bed temperature, and particle size of the bed material. The bubble frequency increased with increasing gas velocity and bed temperature, while it decreased with increasing particle size of the bed material. Correlations to predict the bubble properties in annular fl uidized-bed reactors were suggested.

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Bubble properties and pressure fluctuations in pressurized bubble columns

Cited by 63 publications

References 21 publications

Two-Phase Bubble Columns: A Comprehensive Review

Two-Phase Bubble Columns: A Comprehensive Review

Radial Liquid Dispersion and Bubble Distribution in Three‐Phase Circulating Fluidized Beds

Analysis of gas flow behavior in an annular fluidized-bed reactor for polystyrene waste treatment

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