Abstract
This paper deals with a flow of an aqueous surfactant solution due to a rotating disc in a cylindrical casing with aspect ratio H/R =1 and 2, where H and R is the height of the cylindrical casing and the radius of the rotating disc, respectively. The aqueous surfactant solution (C14 TASal), whose concentration is 0.4, 0.8 and 1.2%, is consisted of n-tetradecyltrirnethylammonium bromide (C14TABr) and sodium salicylate (NaSal). Rheological properties such as a first normal stress difference and a shear viscosity of the surfactant solution are measured with a rheometer and a viscometer. The behavior of the secondary flow has been investigated using a flow visualization technique and a two-component laser Doppler velocimetry (LDV) system. The patterns of the secondary flow are classified using the Reynolds and elastic numbers. We found the secondary flow which was moving up and down at a constant frequency near the rotating disc, as not seen in polymer solutions.
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