Diagnosis of bubble distribution and mass transfer in pressurized bubble columns with viscous liquid medium

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

doi:10.1016/s0009-2509(99)00209-2

Cited by 58 publications

(27 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the relationship between k L a and U G is less than linear, in agreement with the considerations proposed in Section 2.6.1-the relationship between k L a and ε G is related to the shape of the gas hold-up curve, depending on the flow regime; indeed, in the transition/heterogeneous flow regimes, the dispersed phase is transported through the column as large "coalescence-induced" bubbles, having a lower residence time and thus, a lower mass transfer rate. This observation is in agreement with the experimental observations reported by Letzel et al [170], Kang et al [179] and Ozturk et al [173] (Figures 33-35). On the other hand, it has been observed that increasing the operating pressure increases k L a, owing to the decrease in bubble size (as previously stated).…”

Section: Influence Of the Bubble Column Operating Conditionssupporting

confidence: 93%

“…Indeed, the liquid viscosity, if above the maximum value dictated by the "dual effect", increases the mean diameter of the bubbles in the dispersion, thus reducing k L a. (as observed by Kang et al [179]). In this condition, the lather bubbles are stable in the flow at higher viscosities.…”

Section: Influence Of the Liquid And Gas Phase Propertiesmentioning

confidence: 75%

“…This method is based on the measurement of the liquid free surface before and after aeration. Another well-known method is based on the measurement of the differential pressure between two or more points in the column [80,86,114,116,122,123,125,126,135,141,170,179,194,198,209], under the hypothesis of negligible acceleration and friction pressure losses, as discussed by Leonard et al [1]. This method has been applied by a large number of authors.…”

Section: The Gas Hold-upmentioning

confidence: 99%

See 2 more Smart Citations

Two-Phase Bubble Columns: A Comprehensive Review

2018

View full text Add to dashboard Cite

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.

show abstract

Section: Influence Of the Bubble Column Operating Conditionssupporting

confidence: 93%

Section: Influence Of the Liquid And Gas Phase Propertiesmentioning

confidence: 75%

Section: The Gas Hold-upmentioning

confidence: 99%

See 1 more Smart Citation

Two-Phase Bubble Columns: A Comprehensive Review

2018

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Table 1 gives some of the correlations from literature for the volumetric coefficient for different reactor systems. It can be seen that different types of vessels / columns such as stirred tank [13], slurry bioreactor [16], airlift [22,23,26], bubble columns [14,15,17,18,20,21,27,28] have been used in mass transfer studies. In literature there have not been many reports on studies relating to the volumetric mass transfer coefficient for oxygen in biodegradation of phenol in bubble column bioreactors.…”

Section: Introductionmentioning

confidence: 99%