Evolution of the fractal dimension for simultaneous coagulation and sintering

Hans Joachim Schmid, Belal Al-Zaitone, Christian Artelt, Wolfgang Peukert

Research output: Contribution to journalConference articlepeer-review

58 Citations (Scopus)

Abstract

Simulation results on the evolution of aggregate structure in aerosol processes with coagulation and sintering as the dominant mechanisms are presented. A model for simulation of the three-dimensional morphology of nano-structured aggregates formed by concurrent coagulation and sintering is applied. The model is based on a stochastic diffusion controlled cluster-cluster aggregation algorithm and sintering is modeled as a successive overlapping of spherical primary particles, which are allowed to grow in order to maintain mass conservation. This leads to computer simulated structured aggregates which are then subject to evaluation. Two different methods to determine the fractal dimension are presented which give comparable results. It is shown that even very small particles show the same fractal behavior. Furthermore, equilibrium structures assuming a constant ratio of the characteristic collision time to the characteristic fusion time are considered as well as the kinetics of structural changes due to a change in the ambient conditions.

Original languageEnglish
Pages (from-to)293-305
Number of pages13
JournalChemical Engineering Science
Volume61
Issue number1
DOIs
Publication statusPublished - Jan 2006
Externally publishedYes
EventAdvances in Population Balance Modelling -
Duration: May 5 2004May 7 2004

Keywords

  • Coagulation
  • Fractals
  • Nanostructure
  • Particle formation
  • Simulation
  • Sintering

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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