Bubble fractionation and dynamic adsorption layer

The problem of total amount of surfactant on a mobile bubble surface is important for bubble fractionation. In bubble fractionation (Clarke Wilson 1983) surface active material is transferred to the upper section of a liquid column through adsorption on rising bubbles followed by the release at the top of the column as the bubbles burst or accumulate in foam. 

In calculating surfactant transfer to foam, it is usually assumed that the value of surface concentration of surfactant on the surface of a buoyant bubble is equal to r . On the other hand we know that the equilibrium value of surface concentration cannot be established in each case 

Results presented in this chapter are, of course, preliminary. In order to obtain reliable predictions and recommendations, which are of interest for technology and mathematical modelling of surfactant transfer to foam it is important to take into account the following factors  

bubble deformation and real structure of flow at arbitrary Re  

bubble volume fraction dependence of the process of surfactant transfer to foam  

---