Aeration and mixing in deep tank fermentation systems

Jackson, Melbourne L.; Shen, Chia-Cheuh

doi:10.1002/aic.690240108

Cited by 62 publications

(14 citation statements)

References 6 publications

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“…The volumetric mass transfer coefficient is calculated from the dissolved oxygen (DO) measurements, a natural logarithm of c * DO − c DO was taken and plotted against time. Then the angular coefficient (k L a) of the curve was calculated, the result was normalized to 20 • C [10].…”

Section: Experimental System and Vessel Geometrymentioning

confidence: 99%

Modelling mass transfer in an aerated 0.2m3 vessel agitated by Rushton, Phasejet and Combijet impellers

Moilanen¹,

Laakkonen²,

Visuri³

et al. 2008

Chemical Engineering Journal

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Section: Experimental System and Vessel Geometrymentioning

confidence: 99%

Modelling mass transfer in an aerated 0.2m3 vessel agitated by Rushton, Phasejet and Combijet impellers

Moilanen¹,

Laakkonen²,

Visuri³

et al. 2008

Chemical Engineering Journal

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“…This step change was realized by interchanging air and nitrogen at the same superficial gas velocity. In this work, we employed the correction model, Equation , proposed by Garcia‐Ochoa and Gomez to correct k L a values:

C_{m e} = C^{*} + \frac{C^{*} - C_{0}}{1 - T_{r} k_{L} a} \cdot [T_{r} k_{L} a \cdot \exp true(\frac{- t}{T_{r}} true) - normalexp false(- k_{L} a \cdot t false)]

In order to allow for comparison with the literature, mass‐transfer coefficients were normalized to 20 °C according to the formula of Jackson and Shen

{(k_{L} a)}_{20 ° C} = 1.022 {{}^{(20 - θ)}{(k_{L}} a)}_{θ}

…”

Section: Measurement and Evaluation Methodsmentioning

confidence: 99%

“…In this work, we employed the correction model, Equation (1), proposed by Garcia-Ochoa and Gomez [13] to correct k L a values: In order to allow for comparison with the literature, mass-transfer coefficients were normalized to 20 8C according to the formula of Jackson and Shen. [14] ðk L aÞ 20 8C ¼ 1:022 ð20ÀuÞ ðk L aÞ u ð2Þ…”

Section: Measurement and Evaluation Methodsmentioning

confidence: 99%

Power consumption, gas holdup, and mass‐transfer coefficient of triple‐impeller configurations in a stirred vessel with vertical tubular coils

2016

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Three kinds of impeller combinations (3 × 4WHd, HB + 2 × 4WHd, 2 × HB + 4WHd) were used to investigate the effects of coil baffles on system power consumption, gas holdup, and mass transfer coefficient. The experiments were performed in a dish‐bottomed vessel with a diameter of 0.29 m. Results of the power consumption experiments show that at the same rotation speed and an increasing rate of gas flow, the power consumptions of 3 × 4WHd and 2 × HB + 4WHd with coil baffles are almost the same as that of a system with four planar baffles, but there is a clear power draw for the HB + 2 × 4WHd combination. At rotational speeds of 250–350 rpm, the largest power draws for the 2 × HB + 4WHd, HB + 2 × 4WHd, and 3 × 4WHd impeller combinations equipped with coil baffles are 27, 25, and 15 %, respectively. The gas holdup experiment shows that with installation of coil baffles in the vessel, axial and radial impeller combinations can achieve gas dispersion identical to that attained with planar baffles. At the same power input and superficial gas rate over a wide range of gas velocities, the kLa values of the coil baffles for the 3 × 4WHd and 2 × HB + 4WHd combinations are almost identical to those of a conventional system with four baffles. However, in the HB + 2 × 4WHd system, kLa values of the coil baffles are 15 % higher than for planar baffles at low gas velocities and 30 % higher at high superficial gas rates. Finally, all data from the experiments on gas holdup and kLa values may be correlated through the equations ϵ=α(Pg/V)β(Vs)γ and KL a=K1(PG/V)K2(VS)K3.

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“…(78) and (67) and rearranging into dimensionless groups lead to a correlation for the volumetric mass transfer coefficient Kawase et al (1987), D c =0.76m Kawase et al (1987), D c =0.23m El. Temtamy et al (1984) Koide et al, (1983) Nakao et al (1983 Nakanoh & Yoshida (1980) Jackson & Shen (1978), D c =7.62m Jackson & Shen (1978), D c =1.83m …”

Section: Mass Transfer Coefficient Correlation For Gas Bubblesmentioning

confidence: 96%