Numerical investigation on particle deposition enhancement in duct air flow by ribbed wall

Hao Lu, Lin Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)

Abstract

This paper studied the particle deposition in turbulent duct air flows with smooth and ribbed walls numerically. The RSM model with turbulent fluctuation correction and Lagrangian track method were adopted to investigate the particle deposition enhancement by ribbed surface. The air flow velocity profiles for both smooth and ribbed-ducts as well as particle deposition velocity on smooth wall obtained in the present simulation were validated by agreeing well with the previous related study data. Particle deposition is significantly enhanced by surface ribs, especially in turbulent diffusion and eddy diffusion-impaction regimes. It is found that the captures of turbulent eddies induced by ribs and entrainments of large turbulent kinetic energy (T.K.E.) to the wall are the main mechanism for deposition enhancement of small particles. Moreover, pressure drop-weighted efficiency ratio of particle deposition enhancement for ribbed surface is evaluated in this study. The efficiency ratio for ribbed surface can reach more than 100 for particle sizes 0.2-3μm but only about 2-3 for particle sizes 20-50μm. This study shows that the repeated ribs on the surface could be an effective and efficient choice for particle deposition enhancement, especially for micron-meter particles.
Original languageEnglish
Pages (from-to)61-72
Number of pages12
JournalBuilding and Environment
Volume85
DOIs
Publication statusPublished - 1 Feb 2015

Keywords

  • CFD
  • Deposition enhancement
  • Particle deposition
  • RSM model
  • Surface ribs

ASJC Scopus subject areas

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

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