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Dissolution of a $\text{CO}_{2}$ spherical cap bubble adhered to a flat surface in air-saturated water

  • Pablo Peñas-López (a1), Miguel A. Parrales (a1) and Javier Rodríguez-Rodríguez (a1)


Bubbles adhered to partially hydrophobic flat surfaces often attain a spherical cap shape with a contact angle much greater than zero. We address the fundamental problem of the diffusion-driven dissolution of a sessile spherical cap bubble (SCB) adhered to a flat smooth surface. In particular, we perform experiments on the dissolution of $\text{CO}_{2}$ bubbles (with initial radii ${\sim}1~\text{mm}$ ) immersed in air-saturated water adhered to two substrates with different levels of hydrophobicity. It is found that the contact angle dynamics plays an important role in the bubble dissolution rate. A dissolution model for a multicomponent SCB in an isothermal and uniform pressure environment is then devised. The model is based on the quasi-stationary approximation. It includes the effect of the contact angle dynamics, whose behaviour is predicted by means of a simplified model based on the results obtained from adhesion hysteresis. The presence of an impermeable substrate hinders the overall rate of mass transfer. Two approaches are considered in its determination: (a) the inclusion of a diffusion boundary layer–plate interaction model and (b) a finite-difference solution. The model solutions are compared with the experimental results, yielding fairly good agreement.


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Dissolution of a $\text{CO}_{2}$ spherical cap bubble adhered to a flat surface in air-saturated water

  • Pablo Peñas-López (a1), Miguel A. Parrales (a1) and Javier Rodríguez-Rodríguez (a1)


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