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Effect of multiple impeller designs and configurations on the droplet size and uniformity in a 100 L scale stirred tank

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Abstract

This study investigated the effect of multiple impeller designs and configurations on the Sauter mean diameter and the uniformity of droplet size in a 100 L scale stirred tank. By using a borescope installed inside the tank, droplet images of a highly turbid liquid-liquid system were captured even at high impeller speeds, and by adjusting the borescope position, it could be observed how the droplet size changed depending on the position. The area of the flow pattern produced by the impeller was taken as an impeller region, and it explained well the change in the droplet size due to the varying liquid phase volume and impeller spacing. In addition, the change of the Sauter mean diameter and the droplet size uniformity was also elucidated by the variation of the impeller diameter, blade angle, and number of impellers. All three parameters showed a decrease in the deviation between droplet sizes as they increased, but increasing the impeller diameter was the most effective in reducing the Sauter mean diameter itself.

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Abbreviations

B:

bottom clearance of the lower impeller [cm]

D:

reactor diameter [cm]

DI :

impeller diameter [cm]

di :

droplet diameter [cm]

d32 :

Sauter mean diameter [cm]

H:

liquid phase height [cm]

M:

torque of the impeller [N m]

N:

impeller speed [s−1]

NI :

number of impellers [−]

ni :

number of droplets

P:

power consumption [W]

R:

:impeller zone radius [cm]

S:

impeller spacing [cm]

T:

top clearance of the upper impeller [cm]

V:

liquid phase volume [L]

VI :

impeller zone volume [L]

W:

impeller blade width [cm]

\(\overline \varepsilon \) :

mean energy dissipation rate [W kg−1]

θ :

impeller blade angle of the upper impeller [°]

ϕ :

organicphase holdup [−]

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea

    Jeil Park & Jae W. Lee

  2. Hanwha Solutions R&D Institute, 76 Gajeong-ro, Yuseong-gu, Daejeon, 34128, Korea

    Wooyoul Ahan

Authors
  1. Jeil Park
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  2. Wooyoul Ahan
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  3. Jae W. Lee
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Correspondence to Jae W. Lee.

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Park, J., Ahan, W. & Lee, J.W. Effect of multiple impeller designs and configurations on the droplet size and uniformity in a 100 L scale stirred tank. Korean J. Chem. Eng. 38, 1348–1357 (2021). https://doi.org/10.1007/s11814-021-0803-7

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  • DOI: https://doi.org/10.1007/s11814-021-0803-7

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