Interactions between falling spheres in the wormlike micellar solutions

摘要

Due to increasing use of the wormlike micellar solutions in many branches of industry, it may suggest that the study of sedimentation and interactions between falling particles in the gel-like liquids is necessary. In this paper the flow instabilities during the sedimentation of side-by-side falling rigid spheres, have been presented. The cetyltrimethylammonium bromide with addition of sodium salicylate (CTAB/NaSal) aqueous solutions of concentrations of 40/40 mM and 10/40 mM, have been used. The interactions between the falling particles in micellar solutions more strongly depend on the initial separate distance than in the polymer solutions. It has been shown that before and even after the collision still the oscillations appear. The fluctuations in wormlike micellar solutions are with the time damped.