Elastic convection in vibrated viscoplastic fluids |
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Authors: | Shiba Hayato Ruppert-Felsot Jori E Takahashi Yoshiki Murayama Yoshihiro Ouyang Qi Sano Masaki |
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Institution: | Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. |
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Abstract: | 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. |
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