A computational investigation of particle distribution and deposition in a 90° bend incorporating a particle-wall model

Ke Sun, Lin Lu, Hai Jiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

This paper investigates the particle flow movement and deposition in a 90° bend after a straight duct, utilizing the Lagrangian particle-tracking model incorporated with a particle-wall collision model. Particle turbulent dispersion is introduced by employing the 'eddy lifetime' model, and particle deposition velocity in the bend is proposed by counting the number of deposited trajectories in a time period. The developed models are validated for both airflow and particle flow by previous experimental data. Particle distribution and deposition behavior at five size groups (1, 3, 5, 9, and 16. μm) are investigated. The simulation results show that, compared with traditional 'Trap' model, the particle-wall collision model postpones the emergence and slows the increase of the 'particle free zone' as the particle diameter increases. Particle deposition velocity in the duct bend is also generally predicted by the proposed estimation equation under the simulated conditions. This reveals that adopting the particle-wall collision model obtains a reasonable prediction of particle distribution and deposition in the duct bend. This work will benefit the understanding and application of microparticle flow in curved duct systems.
Original languageEnglish
Pages (from-to)1251-1262
Number of pages12
JournalBuilding and Environment
Volume46
Issue number6
DOIs
Publication statusPublished - 1 Jun 2011

Keywords

  • 90° bend
  • CFD
  • Distribution and deposition
  • Particle flow
  • Particle-wall collision

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction

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