Bio-inspired patterned surface for submicron particle deposition in a fully developed turbulent duct

Haolun Xu, Sau Chung Fu, Ka Chung Chan, Huihe Qiu, Christopher Y.H. Chao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

Arrays of surface ribs have been reported to significantly enhance particle collection efficiency in particle removal devices. However, the surface ribs also cause a higher pressure drop. Therefore, the overall performance needs to take into consideration the above factors. In this study, different forms of surface ribs inspired by nature were designed and parametric studies were performed to enhance deposition efficiency. Our parametric studies comprised three different aspects: geometry of the patterned surface, pitch-to-height ratio, and particle size. The flow field around patterned surfaces was simulated in a two-dimensional channel flow by using the Reynolds stress model, corrected by turbulence velocity fluctuation in the wall-normal direction. The particle trajectory was solved by using Lagrangian particle tracking. When the overall efficiency ratio was considered, a semi-circular pattern had the best overall efficiency with 1137 times increase when compared to the case without patterns. Although the open-circular pattern has the minimum particle deposition enhancement, the overall efficiency of the open-circular pattern has 862 times increase compared to the case without patterns. Surface ribs (semi-circular, triangular and rectangular) can achieve a higher particle deposition velocity, but a higher flow resistance is generated compared with applying the open-circular surface ribs. The deposition location was then investigated for different surface ribs at different pitch-to-height ratios (p/e). This study shows that the semi-circular surface pattern should be recommended to enhance the overall performance of particle removal devices, especially for submicron particles.

Original languageEnglish
Pages (from-to)1111-1123
Number of pages13
JournalBuilding Simulation
Volume13
Issue number5
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • bio-inspired
  • fully developed turbulent flow
  • particle deposition
  • submicron particles
  • surface rib array

ASJC Scopus subject areas

  • Building and Construction
  • Energy (miscellaneous)

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