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The nonmatched density of glass beads and silicone oil could affect the result. We therefore performed experiments in quasi-1D and quasi-2D systems with density-matched suspensions using 100 μm polyethylene powder (0.958 g/ cm3) and 30 mm2 /s silicone oil (0.955 g/ cm3). We found no significant difference in the result between the non-density-matched and density-matched suspensions, and we conclude that sedimentation is not crucial
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The nonmatched density of glass beads and silicone oil could affect the result. We therefore performed experiments in quasi-1D and quasi-2D systems with density-matched suspensions using 100 μm polyethylene powder (0.958 g/ cm3) and 30 mm2 /s silicone oil (0.955 g/ cm3). We found no significant difference in the result between the non-density-matched and density-matched suspensions, and we conclude that sedimentation is not crucial.
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If we wait more than a few minutes after stirring, which is comparable to sedimentation time, the onset acceleration is constant at ∼190 m/ s2 and shows no dependence on the mean packing fraction. In this case, the local packing fraction near the bottom becomes higher than the mean packing fraction, so the lack of dependence of the mean packing fraction implies that the local packing fraction near the bottom, rather than the mean packing fraction, determines the onset acceleration.
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If we wait more than a few minutes after stirring, which is comparable to sedimentation time, the onset acceleration is constant at ∼190 m/ s2 and shows no dependence on the mean packing fraction. In this case, the local packing fraction near the bottom becomes higher than the mean packing fraction, so the lack of dependence of the mean packing fraction implies that the local packing fraction near the bottom, rather than the mean packing fraction, determines the onset acceleration.
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15
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