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v = d² × g × (ρp - ρf) / (18 × η)
v = 沉降速度 (m/s),d = 颗粒直径 (m),g = 9.81 m/s²
ρp = 颗粒密度,ρf = 流体密度,η = 动力粘度 (Pa·s)
当 ρp < ρf 时,颗粒上浮;当 ρp > ρf 时,颗粒沉降。
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