Abstract
The motion of single bubbles rising in hydrophobically modified alkali-soluble associative (HASE) polymer solutions are experimentally examined. The non-Newtonian liquid is made up of 1.1 and 1.4 wt% HASE polymer solution, which are adjusted to pH ? 7.0 by adding a sodium hydroxide solution. Rising bubbles with threadlike shapes are observed, regardless of small Deborah number conditions. It is shown that unique shapes of the bubble largely depend on the HASE solution and the bubble size. Consideration for unique shapes is made based on enlarged pictures taken with a high-speed video camera.
