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Related Experiment Videos

Changes in fractal dimension during aggregation.

Rajat K Chakraborti1, Kevin H Gardner, Joseph F Atkinson

  • 1Department of Civil, Structural and Environmental Engineering, State University of New York at Buffalo, 207 Jarvis Hall, Buffalo, New York 14260, USA. rkc@acsu.buffalo.edu

Water Research
|January 18, 2003
PubMed
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The fractal dimension of latex microsphere aggregates decreases over time during initial floc formation. This study quantifies changes in aggregate structure during flocculation under varying conditions.

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Fluid Dynamics

Background:

  • Flocculation is a critical process in water treatment and industrial separations.
  • Understanding aggregate structure, quantified by fractal dimension, is key to controlling flocculation.
  • Temporal changes in fractal dimension provide insights into aggregate growth dynamics.

Purpose of the Study:

  • To investigate the temporal evolution of fractal dimension in latex microsphere aggregates.
  • To analyze how mixing speed, coagulant dose, and particle concentration affect aggregate structure.
  • To develop a method for accurately measuring aggregate geometry and fractal dimension.

Main Methods:

  • Utilized non-intrusive optical sampling and digital image analysis.

Related Experiment Videos

  • Measured particle size distributions and aggregate geometrical information over time.
  • Varied experimental conditions including mixing speed, alum dose, and particle concentration.

    • Main Results:

    • The two-dimensional fractal dimension ranged from 1.48 to 1.94, indicating structures from loosely aggregated to relatively compact.
    • A quantitative measure of accuracy for fractal dimension determination was developed.
    • For initially monodisperse suspensions, fractal dimension decreased during early floc formation.

    Conclusions:

    • Aggregate structure evolves over time, transitioning from more open to denser configurations.
    • The conceptual model explains fractal dimension changes based on aggregate growth and structural alterations.
    • Accurate measurement of fractal dimension is crucial for understanding and predicting flocculation behavior.