Abstract
The motion of single bubbles rising in a hydrophobically modified alkali-soluble associative (HASE) polymer solution is experimentally examined. The polymeric liquid is made up of 1.6 wt% HASE polymer solution, which are adjusted to pH ≈ 7.0 by adding a sodium hydroxide solution. In this study, we focus on unique threadlike shapes formed at the bottom of the bubble. Trailing edges with threadlike branches are observed in detail for the Eotvos number. Consideration for trailing edges with threadlike branches is made based on enlarged pictures taken with a high-speed video camera. As the Eotvos number is increased, it is shown that the number of threadlike branch is increased.
