| Title | Dissolution of a CO2 spherical cap bubble adhered to a flat surface in air-saturated water |
|---|---|
| Authors | Penas-Lopez, Pablo , PARRALES BORRERO, MIGUEL ÁNGEL, Rodriguez-Rodriguez, Javier |
| External publication | No |
| Means | J. Fluid Mech. |
| Scope | Article |
| Nature | Científica |
| JCR Quartile | 1 |
| SJR Quartile | 1 |
| JCR Impact | 2.514 |
| SJR Impact | 1.896 |
| Publication date | 01/07/2015 |
| ISI | 000358715300006 |
| DOI | 10.1017/jfm.2015.291 |
| Abstract | 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 CO2 bubbles (with initial radii similar to 1 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. |
| Keywords | bubble dynamics; contact lines |
| Universidad Loyola members |