Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

Jesus, Sérgio S. de; Neto, João Moreira; Santana, André Bento Chaves; Filho, Rubens Maciel

doi:10.1002/aic.14871

Cited by 25 publications

(7 citation statements)

References 47 publications

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“…Dynamic gassing , was applied to measure the overall gas‐liquid volumetric mass transfer coefficient ( k L a ). The dissolved oxygen probe was used to assess the dissolved oxygen concentration in the fluids.…”

Section: Methodssupporting

confidence: 92%

Effect of Surface Tension on Hydrodynamics and Mass Transfer Coefficient in Airlift Reactors

2020

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The hydrodynamics and volumetric mass transfer coefficient play important roles in the design and scale-up of airlift reactors. The effect of surface tension on hydrodynamics and volumetric mass transfer coefficient in internal loop airlift reactors was investigated. With reduction of the surface tension of the fluid, the hydrodynamic parameters raised, namely, gas phase holdup, flow regime transition point, and interfacial area, whereas the bubble diameter as well as the liquid velocity decreased and the volumetric mass transfer coefficient increased. Empirical correlations are proposed for gas-phase holdup and volumetric mass transfer coefficient in terms of dimensionless numbers and can be applied in the design of airlift reactors.

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Section: Methodssupporting

confidence: 92%

Effect of Surface Tension on Hydrodynamics and Mass Transfer Coefficient in Airlift Reactors

2020

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“…In the case of the same impeller diameter, power input and superficial gas velocity are important factors affecting the overall gas holdup of the reactor 2,32,43 . The empirical correlation in the literature is expressed as follows:

ε = α P_{V}^{β} v_{s}^{γ}

…”

Section: Resultsmentioning

confidence: 99%

“…A frequency converter and a torque sensor are used to measure the stirring speed and torque values, respectively. Owing to the existence of friction, the net torque M is obtained by subtracting the idling torque M Idling from the load torque M Load , then the stirring power P 1 and the power per unit volume consumption P V are calculated using the following equations 4,32 …”

Section: The Experiments and Measurementmentioning

confidence: 99%

Circulating jet for enhancing the mass transfer in a gas–liquid stirred tank reactor

Wang

et al. 2021

AIChE Journal

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There are some problems in gas–liquid stirred tank reactor (STR), such as low mass transfer efficiency, high exhaust gas oxygen concentration, and low product conversion rate, due to limitations of stirring speed and input power. This article summarizes the effect of adding circulating jet internals on bubble size distribution, overall gas holdup, gas–liquid volumetric mass transfer coefficient, and power per unit volume of the STR. When circulating jet is added, the average bubble Sauter mean diameter in the STR is reduced to 1.26 mm, and the overall gas holdup is increased to 8.23%, which is an increase of 3.62 times of the original STR. The gas–liquid volumetric mass transfer coefficient is increased to 0.05556 s−1, which is 4.84 times of the original STR. The power per unit volume is increased by only 1.4 times. These data provide references for the design and scale‐up of new jet STRs.

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“…The liquid level difference method is usually used to measure the overall gas holdup [19]. The liquid level difference during operation is measured, and the gas holdup is calculated by a formula [20].…”

Section: Gas Holdupmentioning

confidence: 99%

Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator

Dai

Guo

Liu

et al. 2020

Water

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In order to understand the aeration performance of inverted umbrella aerator and bubble characteristics in aeration tank under different conditions, and to reveal the internal relationship between bubble characteristics and aeration performance, an experimental bench of dissolved oxygen concentration and high-speed photography was built. Logarithmic oxygen deficit values were fitted under various conditions. The images captured by high-speed photography were processed, then the bubble characteristics were extracted accurately. It was found that the standard oxygen mass transfer coefficient increased linearly with an increase of rotational speed at a certain immersion depth, and increased firstly then decreased with a decrease of immersion depth when rotational speed was kept constant. The bubble size ranged from 0 mm to 1.59 mm under different working conditions, and the variation of the gas holdup was the same as the standard oxygen mass transfer coefficient when the rotational speed and immersion depth were changing. It was shown that bubbles play a leading role in the process of oxygen mass transfer and have a great influence on oxygen mass transfer rate.

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Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

Cited by 25 publications

References 47 publications

Effect of Surface Tension on Hydrodynamics and Mass Transfer Coefficient in Airlift Reactors

Effect of Surface Tension on Hydrodynamics and Mass Transfer Coefficient in Airlift Reactors

Circulating jet for enhancing the mass transfer in a gas–liquid stirred tank reactor

Experimental Study on Aeration Performance and Bubble Characteristics of Inverted Umbrella Aerator

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