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Three-dimensional simulation of viscous-flow agglomerate sintering

M. J. Kirchhof1, H.-J. Schmid2,*, and W. Peukert3

  • 1Department of Research and Development, Burgmann Industries GmbH & Co. KG, Äußere Sauerlacher Str. 6-10, 82515 Wolfratshausen, Germany
  • 2Mechanical & Environmental Process Engineering, University of Paderborn, Pohlweg 55, 33098 Paderborn, Germany
  • 3Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nuremberg, Cauerstr. 4, 91058 Erlangen, Germany

  • *Author to whom correspondence should be addressed.
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Phys. Rev. E 80, 026319 – Published 31 August, 2009

DOI: https://doi.org/10.1103/PhysRevE.80.026319

Abstract

The viscous-flow sintering of different agglomerate particle morphologies is studied by three-dimensional computer simulations based on the concept of fractional volume of fluid. For a fundamental understanding of particle sintering characteristics, the neck growth kinetics in agglomerate chains and in doublets consisting of differently sized primary particles is investigated. Results show that different sintering contacts in agglomerates even during the first stages are not completely independent from each other, even though differences are small. The neck growth kinetics of differently sized primary particles is determined by the smaller one up to a size difference by a factor of approximately 2, whereas for larger size differences, the kinetics becomes faster. In particular, the agglomerate sintering kinetics is investigated for particle chains of different lengths and for different particle morphologies each having ten primary particles and nine initial sintering contacts. For agglomerate chains, the kinetics approximately can be normalized by using the radius of the fully coalesced sphere. In general, different agglomerate morphologies show equal kinetics during the first sintering stages, whereas during advanced stages, compact morphologies show significantly faster sintering progress than more open morphologies. Hence, the overall kinetics cannot be described by simply using constant morphology correction factors such as fractal dimension or mean coordination number which are used in common sintering models. However, for the first stages of viscous-flow agglomerate sintering, which are the most important for many particle processes, a sintering equation is presented. Although we use agglomerates consisting of spherical primary particles, our methodology can be applied to other aggregate geometries as well.

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Phys. Rev. E 80, 026319– Published 31 August, 2009
  • Received 9 February 2009

© 2009 American Physical Society

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