Pressure fluctuations and bubble size in viscous three-phase circulation fluidized bed bioreactors

Son, Sung Mo; Shin, Ik Sang; Kang, Suk Hwan; Kang, Yong; Kim, Sang Done

doi:10.1007/s11814-007-0056-0

Cited by 8 publications

(19 citation statements)

References 18 publications

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“…The variations of Kolmogorov entropy of pressure fluctuations in the riser agreed well with the shapes of attractors, implying that the turbulence and aggressive contacting among multiphase in the riser would increase with increasing U G or G S (Cho et al, 2001a). Son et al (2007a) used the correlation dimension of pressure fluctuations to consider the quantitative measure of the resultant bubbling phenomena in the riser due to the flow and contacting of three phases. The value of correlation dimension of pressure fluctuations increased with increasing U G or μ L , indicating that the flow could be more complicated with increasing U G or μ L .…”

Section: Three-phase Circulating Uidized Beds (Tpcfbs)mentioning

confidence: 65%

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

Kang

Kim²,

Yang

et al. 2018

J. Chem. Eng. Japan / JCEJ

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The characteristics of three-phase (gas-liquid-solid) circulating uidized beds (TPCFBs) are discussed in order to visualize the unique features and advantages thereof due to the intrinsic ow and contacting behaviors of multi-phases, providing a better understanding of the state of art of TPCFBs and their feasible applications as multi-phase reactors and contactors. The hydrodynamics such as individual phase holdups, bubbling ow behaviors, bubble properties and liquid phase dispersions, and heat and mass transfer characteristics in the riser were examined based on the previous investigations. (k L a), gas-liquid interfacial area (a) and liquid side mass transfer coe cient (k L ) were determined. The information on the heat and mass transfer, however, were extremely limited comparing with those of hydrodynamics. Some correlations were suggested to predict the hydrodynamic parameters, and the values of h, k L a, a, and k L in the riser of the TPCFBs to provide insights for the present and future studies. The mechanism of heat and mass transfer and their modeling should be conducted for the better prediction of the performance of the TPCFB-reactors and contactors in the future. Although the information in the riser of various kinds of TPCFBs deviated from each other depending on the solid circulation modes and experimental conditions, they were summarized and consociated for the elucidation of the present states and views of the investigations. Rational guides to predict the hydrodynamics and heat and mass transfer phenomena in the riser of the TPCFB were possible by analyzing and synthesizing the results reported in the literatures presently available. Especially, the e ects of operating variables including gas (U G ) and liquid (U L ) velocities, properties of uidized solid particles and continuous liquid media, and solid circulation rate (Gs) on the hydrodynamic parameters and the heat and mass transfer characteristics such as heat transfer coe cient (h) and resistance, volumetric mass transfer coe cient

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Section: Three-phase Circulating Uidized Beds (Tpcfbs)mentioning

confidence: 65%

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

Kang

Kim²,

Yang

et al. 2018

J. Chem. Eng. Japan / JCEJ

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“…In addition, the wake regions could also coalesce with each other whenever bubble coalescence could occur. It has been reported that the bubble rising velocity increases with increasing gas velocity [14][15][16]; thus, the rising velocity of the wake region can also increase with increasing gas velocity, since the rising bubbles are tailed by wakes.…”

Section: Resultsmentioning

confidence: 99%

“…It is noted that the bubble frequency decreases but the rising velocity of bubbles increases, with increasing liquid viscosity. These can be due to the fact that the bubble coalescence could increase with increasing liquid viscosity [14][15][16]. Since the buoyancy force acting on the bubbles, which is due to the difference of density between the bubble and slurry phase, increases with increasing bubble size, the rising velocity of wakes as well as bubbles could increase with increasing liquid viscosity.…”

Section: Resultsmentioning

confidence: 99%

Flow behavior of wakes in a three-phase slurry bubble column with viscous liquid medium

Lím

Jang

Kang

et al. 2011

Korean J. Chem. Eng.

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Flow behavior of wakes has been investigated in a three-phase slurry bubble column of 0.102 m ID and 1.5 m in height. The dependence of wake characteristics such as rising velocity, frequency, holdup and equivalent size on the operating variables was examined by employing an electric resistivity probe method. The gas velocity, liquid viscosity and solid content in the slurry phase were chosen as independent parameters. The rising velocity of wake region increased with an increase in the gas velocity (4.0-12.0 cm/s), liquid viscosity (1.0-50.0 mPa·s) or solid content (0-25 wt%) in the slurry phase. The frequency and holdup of wake phase increased with increasing gas velocity, but decreased with increasing liquid viscosity or solid content in the slurry phase. The equivalent size of wake phase increased with increasing gas velocity, liquid viscosity or solid content in the slurry phase. The wake properties and holdup were well correlated with operation variables within these experimental conditions.

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“…It has been understood that the heat transfer coefficient increases with increasing turbulence intensity in multiphase fluidized beds [16][17][18][19][20]. This can be the reason why the h value increases with increasing U G (Fig.…”

Section: May 2010mentioning

confidence: 99%

“…The heat supply, Q, was obtained from the DC power supply, and it was verified from the energy balance in the riser. Individual phase holdups were determined by means of static pressure drop method [17][18][19][20].…”

Section: May 2010mentioning

confidence: 99%

Multiple effects of operating variables on heat transfer in three-phase slurry bubble columns

Shin

Son

Lím

et al. 2010

Korean J. Chem. Eng.

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Characteristics of heat transfer were investigated in pressurized slurry bubble column reactors whose diameter was either 0.051, 0.076, 0.102 or 0.152 m (ID) and 1.5 m in height, respectively. Effects of gas velocity (U G ), solid contents (S C ), pressure (P), liquid viscosity (µ L ) and column diameter (D) on the heat transfer coefficient (h) between the immersed vertical heater and the column were determined. Multiple effects such as U G and D, P and D, µ L and D, and S C and D on the value of heat transfer coefficient were discussed. Temperature fluctuations were also measured and analyzed by adapting chaos theory, which was used to explain the effects of operating variables on the heat transfer in the column. The heat transfer coefficient increased with increasing gas velocity, pressure or solid content in the slurry phase, but decreased with increasing liquid viscosity or column diameter. The decrease trend of h with increasing column diameter was somewhat sensitive when the gas velocity was relatively high (U G ≥12 cm/s). The effects of column diameter on the h value became almost linear when the operating pressure (P=4-10 kg f /cm 2 ), liquid viscosity (µ L =20-38 mPa·s) or solid content in the slurry phase (S C =10-20 wt%) was relatively high and gas velocity was relatively low, within these experimental conditions. The heat transfer coefficient was well correlated in terms of dimensionless groups as well as operating variables.

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Pressure fluctuations and bubble size in viscous three-phase circulation fluidized bed bioreactors

Cited by 8 publications

References 18 publications

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

Flow behavior of wakes in a three-phase slurry bubble column with viscous liquid medium

Multiple effects of operating variables on heat transfer in three-phase slurry bubble columns

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