Modeling particle deposition on the surfaces around a multi-slot diffuser

Chun Chen, Chao Hsin Lin, Daniel Wei, Qingyan Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)


Enhanced soiling on the wall/ceiling around a diffuser due to particle deposition is very unsightly and reduces our quality of life. This study aimed to model the particle deposition on the surfaces around multi-slot diffusers, which are widely used in transportation vehicles. An SST k-ω model with a modified Lagrangian method was proposed and validated with experimental data on particle deposition rate from the literature. This investigation then conducted chamber tests to qualitatively validate model's ability to predict the deposition distribution around a multi-slot diffuser. Using the validated model, this study numerically investigated the effects of slot setting, supply air angle, and temperature differential on particle deposition around a multi-slot diffuser. The results indicated that, with the same supply airflow rate, increasing the area ratio of openings to bars in a multi-slot diffuser can reduce the particle deposition. When the angle between the supply air jet and the wall was increased to more than 45°, the particle deposition was significantly reduced. Furthermore, the impact of thermophoresis on particle deposition around a multi-slot diffuser was negligible.

Original languageEnglish
Pages (from-to)79-89
Number of pages11
JournalBuilding and Environment
Publication statusPublished - 1 Oct 2016


  • Aerosol
  • Black magic dust
  • Computational fluid dynamics (CFD)
  • Indoor environment
  • Lagrangian tracking
  • Soiling

ASJC Scopus subject areas

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


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