Elastic convection in vibrated viscoplastic fluids.
We observe a new type of behavior in a shear-thinning yield stress fluid: freestanding convection rolls driven by vertical oscillation. The convection occurs without the constraint of container boundaries, yet the diameter of the rolls is spontaneously selected for a wide range of parameters. The transition to the convecting state occurs without hysteresis when the amplitude of the plate acceleration exceeds a critical value. We find that a nondimensional stress, the stress due to the inertia of the fluid normalized by the yield stress, governs the onset of the convective motion.
Shiba
Hayato
H
Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Ruppert-Felsot
Jori E
JE
Takahashi
Yoshiki
Y
Murayama
Yoshihiro
Y
Ouyang
Qi
Q
Sano
Masaki
M