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Drag and yielding of rotating bodies in yield-stress fluids
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DOI：10.1017/jfm.2026.11782.png)
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Abstract
En 中文
We investigate the settling dynamics of rotating objects in a yield-stress fluid by combining controlled experiments with numerical simulations. Experiments were conducted using cylinders and spheres of varying surface roughness; rotated within a Helmholtz coil and immersed in a Carbopol-based yield-stress fluid. Complementary numerical simulations employed a viscoplastic Herschel–Bulkley model to capture the coupled effects of sedimentation and rotation. To parametrise the problem; we define a dimensionless rotational velocity ; but consistently underpredict experimental values; likely due to wall slip and nonlinear effects such as the stagnation-point flow not present in the model. The onset of sedimentation (yield limit) was also measured and found to increase with increasing rotation and to depend on surface roughness. Finally; simulations highlight scaling relations for drag coefficient providing new insight into the interplay of sedimentation; rotation and viscoplastic rheology.
Keywords:
complex fluids
low-Reynolds-number flows
plastic materials
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3.9
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2.0W
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9.4W
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