TY - JOUR
T1 - Impact dynamics of a solid sphere falling into a viscoelastic micellar fluid
AU - Akers, Benjamin
AU - Belmonte, Andrew
N1 - Funding Information:
We would like to thank R.H. (Bob) Geist for experimental assistance, F. Costanzo, T. Grumstrup, N.Z. Handzy, C. Misbah, M.C. Sostarecz, and B. Tilley for helpful comments and discussions, and H.A. Stone for helping to clarify our thinking on the elastic energy scaling. AB acknowledges support from the National Science Foundation (CAREER Award DMR-0094167).
PY - 2006/5/30
Y1 - 2006/5/30
N2 - We present an experimental study of the impact of a solid sphere on the free surface of a viscoelastic wormlike micellar fluid. Spheres of various densities and diameters are dropped from different heights above the fluid surface, reaching it with a nonzero velocity which determines the subsequent dynamics. Measurements of the initial sphere penetration are found to scale with the ratio of the kinetic energy of the sphere at impact to the elastic modulus of the fluid. The cavity formed in the wake of the sphere, observed with high-speed video imaging, also undergoes transitions from a smooth to fractured surface texture, dependent on both the Deborah number and the ratio of the gravitational force to elasticity.
AB - We present an experimental study of the impact of a solid sphere on the free surface of a viscoelastic wormlike micellar fluid. Spheres of various densities and diameters are dropped from different heights above the fluid surface, reaching it with a nonzero velocity which determines the subsequent dynamics. Measurements of the initial sphere penetration are found to scale with the ratio of the kinetic energy of the sphere at impact to the elastic modulus of the fluid. The cavity formed in the wake of the sphere, observed with high-speed video imaging, also undergoes transitions from a smooth to fractured surface texture, dependent on both the Deborah number and the ratio of the gravitational force to elasticity.
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U2 - 10.1016/j.jnnfm.2006.01.004
DO - 10.1016/j.jnnfm.2006.01.004
M3 - Article
AN - SCOPUS:33646343181
SN - 0377-0257
VL - 135
SP - 97
EP - 108
JO - Journal of Non-Newtonian Fluid Mechanics
JF - Journal of Non-Newtonian Fluid Mechanics
IS - 2-3
ER -