Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
The dynamic motion of single bubbles rising in hydrophobically modified alkali-soluble emulsion polymer (HASE) solutions with pH = 9 is experimentally examined. In this study, HASE material is neutralized with sodium carbonate (Na2Co3) and with sodium hydroxide (NaOH), and HASE solutions with almost the same rheological properties are prepared. In the experiment, we focus on the bubble shape and microstructures at interfaces depending on high viscous HASE solutions neutralized by these alkaline materials. As a whole, it is observed that the morphology of trailing edges with threadlike branches is sensitive to the bubble size for both the HASE solutions as reported in previous studies. But, from detailed comparison of experimental results between both the HASE solutions, it is found that the global bubble shape and microstructures emerged from interfaces are similar but slightly different depending on the HASE solutions, even if HASE solutions have almost the same rheological properties.
