Impact of confinement on mass transfer and transport of oxygen around inertial bubbles
Résumé
New experimental results are reported for oxygen reactive mass transfer at the interface of an isolated bubble rising in liquid at rest at large Reynolds number, the bubble being confined in a vertical thin-gap cell of thickness w smaller than the capillarity length. Considered bubbles have a diameter d greater than w and therefore look like ‘pancakes’ separated from the walls by thin liquid films. The flow regime is inertial, and there exists a strong coupling between the bubble motion and its wake dynamics (Filella et al., 2015). The interfacial mass transfer leads to the transport of oxygen in the flow perturbation generated by the bubble motion. Understanding the transport in bubble wakes is our goal as it is crucia for discussing yield and selectivity of reactive mass transfer (Khinast, 2001).
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