𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Hindered settling of rod-like particles measured with magnetic resonance imaging

✍ Scribed by Michael A. Turney; Man Ken Cheung; Robert L. Powell; Michael J. McCarthy

Publisher
American Institute of Chemical Engineers
Year
1995
Tongue
English
Weight
650 KB
Volume
41
Category
Article
ISSN
0001-1541

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✦ Synopsis

Magnetic resonance imaging (MRI) is used to measure the time evolution of the volume fraction us. height profile during batch sedimentation of rod-like particle suspensions. A t any instant during sedimentation, MRI clearly delineates the su- pernatant, suspension, and sediment regions. The rod-like particles with a mean aspect ratio of 17.4 exhibit considerably larger hinderedsettling effects than spherical particles with increasing particle concentrations. This can be attributed in part to the larger increase in interparticle forces and relative viscosities with suspensions of rod-like particles than with suspensions of spherical particles, as the particle concentration increases. The relative viscosity of the rod-like particle suspensions is a function of the spin-spin relaxation time, T2. Since T2 is a measurable MRI quantity, this suggests that MRI may be used as an instrument for rheological measurement.

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