Session MM - Chaos and Fractals.
MIXED session, Tuesday afternoon, November 23
Whidbey, Westin Seattle
Reynolds number dependence of chaotic mixing of fluids in the partitioned-pipe mixer (PPM) is studied by using numerically obtained velocity fields. We found that transport barriers once expand as the Reynolds number, R_e, is increased. Although they tend to disappear with increase in R_e, some of them remain for relatively large R_e in some cases in which a geometrical condition of the system is changed. Existence of the barriers can be related to dimensionality of the velocity field. On mixing in the chaotic region, we found that a high shear region apart from the rigid wall appears as R_e is increased enough. This appearance of a high shear region is expected to enhance mixing efficiency in the chaotic region.