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Mass transfer dynamics in the dissolution of Taylor bubbles
Ghata M Nirmal1, Thomas F Leary1, Arun Ramachandran1
1200 College St, University of Toronto, Toronto, Ontario, Canada. ghata.nirmal@mail.utoronto.ca.
Soft Matter
|January 26, 2019
Summary
A new model accurately determines gas-liquid mass transfer parameters by analyzing Taylor bubble dissolution. This advances the design of separation and reaction units with improved accuracy.
Area of Science:
- Chemical Engineering
- Thermodynamics
- Mass Transfer
Background:
- Accurate thermodynamic and mass transfer parameters are crucial for designing gas-liquid separation and reaction processes.
- Existing models for Taylor bubble dissolution have limitations in mass transfer estimation, mixing assumptions, and variable bubble velocities.
- Taylor bubble shrinkage offers a method for obtaining design parameters if a reliable model is used.
Purpose of the Study:
- To develop a detailed mathematical model for Taylor bubble dissolution that overcomes limitations of existing models.
- To accurately account for local concentration gradients and flow profiles without computationally intensive simulations.
- To extract thermodynamic and mass transfer parameters from experimental data.
Main Methods:
- Developed a novel mathematical model for Taylor bubble dissolution.
- Conducted experiments using segmented flow of CO2 in physical solvents within circular silica capillaries.
- Validated the model by comparing extracted parameters with known values.
Main Results:
- The developed model accurately captures local concentration gradients and flow profiles.
- Diffusivity and solubility were extracted with an error of less than 5%.
- The model overcomes previous limitations in mass transfer estimation and assumptions of a well-mixed liquid segment.
Conclusions:
- The new model provides a reliable method for determining gas-liquid mass transfer parameters from Taylor bubble dissolution.
- This research enables more accurate design of macroscale separation and reaction units.
- The work has potential applications in studying gas-liquid-solid reactions and designing monolithic reactors.
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