Modeling and experiments of polydisperse particle clouds

Adrian C.H. Lai, Ruo Qian Wang, Adrian Wing Keung Law, E. Eric Adams

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A model for polydisperse particle clouds has been developed in this study. We extended the monodisperse particle cloud model of Lai et al. (Environ Fluid Mech 13(5):435–463, 2013) to the case of polydisperse particles. The particle cloud is first considered to be a thermal or buoyant vortex ring, with the thermal induced velocity field modeled by an expanding spherical Hill’s vortex. The buoyancy of the composite thermal is assumed to be the sum of buoyancy contributed by the all particles inside the thermal. Individual particles (of different particle properties) in the cloud are then tracked by the particle tracking equation using the computed induced velocity field. The turbulent dispersion effect is also accounted for by using a random walk model. Experiments of polydisperse particle clouds were carried out to validate the model. The agreement between model predictions and experiments was reasonable. We further validate our model by comparing it with the LES study of Wang et al. (J Hydraul Eng ASCE 141(7):06015006, 2014). The limitations of our model are then discussed with reference to the comparison. Overall, although some flow details are not captured by our model, the simplicity and generality of the model makes it useful in engineering applications.

Original languageEnglish (US)
Pages (from-to)875-898
Number of pages24
JournalEnvironmental Fluid Mechanics
Volume16
Issue number4
DOIs
StatePublished - Aug 1 2016

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modeling
experiment
Experiments
Buoyancy
buoyancy
vortex
Vortex flow
particle
engineering
Fluids
fluid
Hot Temperature
Composite materials
prediction

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Environmental Chemistry

Keywords

  • Buoyant vortex ring
  • Integral models
  • Particle clouds
  • Polydisperse
  • Thermals
  • Two-phase flows

Cite this

Lai, Adrian C.H. ; Wang, Ruo Qian ; Law, Adrian Wing Keung ; Adams, E. Eric. / Modeling and experiments of polydisperse particle clouds. In: Environmental Fluid Mechanics. 2016 ; Vol. 16, No. 4. pp. 875-898.
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Modeling and experiments of polydisperse particle clouds. / Lai, Adrian C.H.; Wang, Ruo Qian; Law, Adrian Wing Keung; Adams, E. Eric.

In: Environmental Fluid Mechanics, Vol. 16, No. 4, 01.08.2016, p. 875-898.

Research output: Contribution to journalArticle

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