Journal
CHEMICAL ENGINEERING JOURNAL
Volume 434, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133478
Keywords
Bubble columns; Bubble column reactors; Axial dispersion coefficient; Axial dispersion model; Uncertainty analysis; Sensitivity analysis
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Funding
- German Research Foundation (DFG) [HA 3088/18-1]
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The proposed study introduces a novel method for determining the axial gas dispersion coefficient in bubble columns using the gas flow modulation technique. The uncertainties and sensitivities related to this method are analyzed, along with the possibility of tailoring the modulation parameters to increase sensitivity and reduce uncertainty.
The gas flow modulation technique has recently been proposed as a novel method for determining the axial gas dispersion coefficient in bubble columns. The approach is based on a marginal sinusoidal modulation of the gas inlet flow rate that acts as a virtual tracer. Axial gas dispersion is then inversely calculated from amplitude damping and phase shift via an analytical solution of the axial dispersion model. The proposed study provides an analysis of the inherent uncertainties related to the assumptions of constant axial gas dispersion coefficient and bubble rise velocity, which are crucial for implementing the method. Besides, the sensitivity of the approach is assessed as a function of the modulation parameters, the bubble rise velocity and the axial gas dispersion co-efficient. Eventually, the possibility of tailoring the modulation parameters depending on the expected value of the axial gas dispersion coefficient to increase the sensitivity and to reduce the uncertainty is also assessed.
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