ヘレショウセルにおけるアクティブ流体のフィンガリング現象

抄録

The interface between stearyl trimethylammonium (STAC) and palmitic acid (PA) vibrates spontaneously because of chemical nonequilibrium. This dynamic motion of the interface is often referred as “blebbing,” and explained as the gel formation and the change in its thickness with time. In this paper, the influence of gel formation by the chemical reaction and blebbing at the interface on the displacement process has been investigated in Hele-Shaw cells. Gel formation at the interface stabilizes the fingering with an increase in the injection rate, in contrast to normal viscos fingering associated with the viscosity ratio. At the concentration of 20 mmol/L of PA and the 20 mmol/L of STAC, the high sweep efficiency was achieved due to suppression of the fingering. In injected aqueous phase, unique residual oil blobs which grow from the web-like structure at the interface was found.