Enhancement of submicron particle deposition on a semi-circular surface in turbulent flow

Haolun Xu, Sau Chung Fu, Wing Tong Leung, Tsz Wai Lai, Christopher Y.H. Chao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


Air pollution due to suspended particles in the built environment threatens people’s health. The collection of submicron particles using air cleaners is especially difficult due to their tiny sizes. Surface patterned structures can enhance submicron particle deposition, thus improving the performance of an air cleaner. In this study, a semi-circular micro-structured surface was designed and optimized by considering particle deposition enhancement and reduction of pressure differential. The maximum efficiency ratio at the pitch-to-height ratio ((Formula presented.)) of 3 reached 1137 for the 1 µm particles but only 3.4 for 0.01 µm particles. The main mechanism of enhancing submicron particle deposition depends on the capture of the recirculation wake induced by semi-circular structures and entrainments of large turbulence kinetic energy to the near-wall regions. Submicron particles was observed to deposit between cavities on the semi-circular surface at a small (Formula presented.). This study shows that surface patterned structures in the semi-circular shape at small (Formula presented.) can enhance the submicron deposition efficiency, thus providing a possible approach to improve the overall efficiency of air cleaners.

Original languageEnglish
Pages (from-to)101-116
Number of pages16
JournalIndoor and Built Environment
Issue number1
Publication statusPublished - 1 Jan 2020


  • Airflow and computational fluid dynamics
  • Particle deposition enhancement
  • Semi-circular structured surface
  • Submicron particles
  • Turbulent flow

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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