Direct Flow Visualization of Colloidal Gels in Microfluidic Channels
Source abstract
Abstract
The behavior of colloidal gels under pressure-driven flow in square microchannels is quantified by microscopic particle image velocimetry (muPIV) and compared to predictions of available rheological models. The gels consist of hydrophobically modified silica microspheres (phi = 0.15-0.33) suspended in a refractive index-matched fluid along with fluorescent tracers to aid visualization. Measured velocity flow profiles show a transition from plug flow to more fluid-like behavior with increasing volumetric flow rate (Q) at all phi. This transition is not captured by theoretical predictions of the flow profile based on the Herschel-Bulkley model. Rather, a model that accounts for gel breakup into a suspension of clusters at elevated shear rates by assuming a finite viscosity at infinite shear is needed to accurately predict the flow behavior of colloidal gels at large Q.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Rheology and Fluid Dynamics Studies · Material Dynamics and Properties · Phase Equilibria and Thermodynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Frederick Seitz Materials Research Laboratory, Materials Science and Engineering Department, Chemical and Biomolecular Engineering Department, and Mechanical Science and Engineering Department, University of Illinois, Urbana, Illinois 61801
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