Abstract
The spreading of soap bubbles after forming contact with a substrate is experimentally studied. We find for dry glass substrate that the rim of the spreading soap bubble follows the well known scaling law for inertia dominated spreading r sim t^{1/2} [Eggers, J., Lister, J., and Stone, H., J. Fluid Mech. 401, 293–310 (1999)]. Varying the viscosity of the soap solutions and the coating of the glass does not affect this spreading behavior qualitatively. Yet, on a wetted surface, the rim obtains a constant radial velocity. Here, the rim splits into two and this new rim trails the main rim. Interestingly, the central film enclosed by the two rims develops radially oriented wrinkles.
Highlights
The spreading of soap bubbles after forming contact with a substrate is experimentally studied
We report on the spreading of soap bubbles made from the three solutions
For this particular example the surface is coated with indium tin oxide (ITO)
Summary
The spreading of soap bubbles after forming contact with a substrate is experimentally studied. We find for dry glass substrate that the rim of the spreading soap bubble follows the well known scaling law for inertia dominated spreading r ∼ t1/2 [Eggers, J., Lister, J., and Stone, H., J. Calculating the corresponding length and time scales at which inertia dominates (see Ref.7), one recognizes that it is rather difficult to observe the viscous regime for water-like fluids (length scale ∼ 15 nm and time scale ∼ 10−10 s). To observe this regime a high viscosity fluid or low surface tension is needed
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