FIG. 32 Profiles of the surfactant concentration at different times for the system of Fig. 31.

In Section III, we will discuss briefly the phenomenon of interbubble gas diffusion (Ostwald ripening), which has been ignored in our model.

III. INTERBUBBLE GAS DIFFUSION (OSTWALD RIPENING)

When the pressure in the foam bubbles varies significantly, there is a transfer of gas from bubbles with higher pressure to those with lower pressure. This transfer occurs by diffusion through the liquid films separating the bubbles