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Modeling Orthokinetic Coagulation in Spatially Varying Laminar Flow.
1Department of Civil Engineering, Auburn University, 238 Harbert Engineering Center, Auburn, Alabama, 36849
Journal of Colloid and Interface Science
|June 30, 2000
Summary
This study developed an orthokinetic coagulation model to simulate particle aggregation in fluid flow. Including mass transfer between regions with varying strain rates is crucial for accurate modeling of particle size and population.
Area of Science:
- Fluid dynamics
- Particle science
- Chemical engineering
Background:
- Orthokinetic coagulation is influenced by fluid flow, particle interactions, and aggregate breakup.
- Accurate modeling requires understanding how flow conditions affect particle aggregation.
Purpose of the Study:
- To develop and evaluate an orthokinetic coagulation model incorporating agglomeration and stress-induced breakup.
- To compare different modeling approaches for simulating coagulation in a specific flow system.
Main Methods:
- Developed an orthokinetic coagulation model.
- Simulated coagulation in flow between eccentric, rotating cylinders.
- Examined four modeling techniques: volume-weighted average strain rates, equivalent volume-weighted power (G), batch reactor elements, and mass transfer between elements.
Main Results:
- Different modeling methods produced substantial variations in average particle diameters and populations.
- Mass transfer between elements significantly impacted simulation outcomes.
- The inclusion of mass transfer is critical for accurate predictions.
Conclusions:
- Mass transfer between regions with differing flow strain rates and velocity gradients must be included in coagulation models.
- Accurate orthokinetic coagulation modeling necessitates accounting for spatial variations in flow conditions and inter-region mass exchange.