Peñas López, PabloParrales Borrero, Miguel ÁngelRodríguez Rodríguez, Francisco Javier2018-05-282018-05-282015-07-25Journal of Fluid Mechanics, 775 (2015), 53-76.0022-1120http://hdl.handle.net/10016/26898Bubbles 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.23application/pdfeng© 2015 Cambridge University PressBubble dynamicsContact angle dynamicsContact linesresearch articleIngeniería Industrialhttps://doi.org/10.1017/jfm.2015.291open access5376Journal of Fluid Mechanics775AR/0000017170