Settling Behavior Characterization of Submicron Particles in Dilute and Concentrated Suspensions

Abstract

In separati on processes, th e kn ow ledge of parti cle size and density arc often not enough to describe th e settlin g behav iour in a co ncentrated suspension. Therefore, a direc t meth od for the characteri za ti on of the settlin g behav ior of submi cron particles in co nce ntrated suspensions is introduced in a centrifugal fi eld by a manometri c sedimentati on analys is. By mean s of thi s cumulative meth od in a homogeneou s suspension, the analyses o f both the in ter fac ial settlin g rate and th e se ttlin g rate of th e parti cles within th e co nce ntrated suspension arc possible. Thi s permits a

New bounds on the sedimentation velocity for hard, charged and adhesive hard-sphere colloids

“…Gaps in the curves for τ = 0.07 and 0.09 Figure 18. Experimental data reproduced from Bickert & Stahl (1996) for adhesive hard spheres of unknown τ .…”

Applications of polydisperse sedimentation models

“…A further difficulty is that Eq. (6) applies only to very dilute suspensions, but this is the range in which "cluster settling" occurs [1,22,23,24]. Hence, calculated and measured velocities may not agree [3], especially when the diameter of the container is large compared to the particle diameter [23,25].…”

“…Hence, calculated and measured velocities may not agree [3], especially when the diameter of the container is large compared to the particle diameter [23,25]. Typically, the interface velocity is less than the mean velocity of the spheres in the interior [1,26], which may be greater than the Stokes velocity [24,26].…”

Pseudo two‐dimensional modeling of sediment build‐up in centrifuges: A compartment approach using compressional rheology

“…Whilst dilute suspensions with unhindered settling are used here, hindered settling can be implemented if necessary. 13,14 The settling of the particles in a centrifuge with a rotor length of L 0 first takes place in a boundary layer flow, where there is strong axial flow. Once the particles have passed this layer, they enter a region in which the axial velocity is one or more orders of magnitude less than in the boundary layer.…”