Dam breaks of viscoplastic material on an inclined plane.

We report experimental results related to the dam-break problem for viscoplastic fluids. Using image processing techniques, we were able to accurately reconstruct the free-surface evolution of fixed volumes of fluid suddenly released on an inclined plane. Carbopol Ultrez 10 was used as a viscoplastic material. Varying the Carbopol concentration allowed us to change the yield stress and bulk viscosity. We investigated the behaviour of a 43-kg mass released on a plane, whose inclination ranged from 0◦ to 18◦. For each run, we observed that the behaviour was nearly the same: at short times, the mass accelerated vigorously on gate opening and very quickly reached a nearly constant velocity. At time t = 1 s, independently of plane inclination and yield stress, the mass reached a nearequilibrium regime, where the front position varied as a power function of time over several decades.


Published in:
Proceedings of the 34th IAHR World Congress, CDrom
Presented at:
34th IAHR Word Congress, Hydraulics Conference, Brisabane, Australia, 26.06-01.07.2011
Year:
2011
Publisher:
Australia, Engineers Australia, July
ISBN:
978-0-85825-868-6
Keywords:
Laboratories:




 Record created 2012-01-30, last modified 2018-03-17


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