The Micromeritics SediGraph is designed to provide particle size distribution analyses for materials based upon sedimentation of the particles through a liquid of known viscosity and density. Stokes’ Law is used to determine the equivalent spherical diameter of the settling particle from its terminal velocity or sedimentation velocity, v. The velocity is based upon the maximum distance that particles have settled, h, and the elapsed time of the analysis, t. The known density, ρo, and viscosity, η, of the suspending liquid, and the apparent skeletal density, ρ, of the settling particles are provided at the start of the analysis. The acceleration due to gravity, a constant, g, is the remaining calculation parameter.
The Micromeritics SediGraph is designed to provide particle size distribution analyses for materials based upon sedimentation of the particles through a liquid of known viscosity and density. Stokes’ Law is used to determine the equivalent spherical diameter of the settling particle from its terminal velocity or sedimentation velocity, v. The velocity is based upon the maximum distance that particles have settled, h, and the elapsed time of the analysis, t. The known density, ρo, and viscosity, η, of the suspending liquid, and the apparent skeletal density, ρ, of the settling particles are provided at the start of the analysis. The acceleration due to gravity, a constant, g, is the remaining calculation parameter.
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