Colloidal gel filtration: Experiment and theory
- Princeton Univ., NJ (United States). Dept. of Chemical Engineering
- Schlumberger-Doll Research, Ridgefield, CT (United States)
The filtration of colloidal gels, consisting of octadecyl-coated silica spheres in hexadecane, is examined experimentally using CAT scanning. A number of interparticle strengths are explored, with significant differences in qualitative behavior relative to the filtration of stable dispersions. For stiff gels, the transmission of stresses from the cell wall to the dispersion results in a fracturing phenomenon during consolidation on a length scale substantially larger than the particle size. For more pliant gels, the radial propagation of stress is more local to the wall region and gravitational effects play a prominent role. The existing theory of network consolidation is compared against the experimental results for pliant gels, independent of the form of the constitutive functions for the sedimentation velocity and yield stress. Though the measurements seem consistent with the theory at early times, deviations at later moments question whether a compressive yield stress is actually present.
- DOE Contract Number:
- FG02-85ER45210
- OSTI ID:
- 6946947
- Journal Information:
- AIChE Journal (American Institute of Chemical Engineers); (United States), Vol. 40:11; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamic localization and shear-induced hopping of particles: A way to understand the rheology of dense colloidal dispersions
The formation of ordered microstructures by slip casting and related processes: Progress report
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COLLOIDS
FILTRATION
SILICON OXIDES
FLOCCULATION
FRAGMENTATION
PARTICLE SIZE
STRESS ANALYSIS
VISCOUS FLOW
CHALCOGENIDES
DISPERSIONS
FLUID FLOW
OXIDES
OXYGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
SILICON COMPOUNDS
SIZE
400105* - Separation Procedures