The weaknesses of a k-e{open} model compared to a large-eddy simulation for the prediction of UV dose distributions and disinfection

B. A. Wols, W. S J Uijttewaal, J. A M H Hofman, L. C. Rietveld, J. C. van Dijk

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

CFD modelling has proven to be a powerful tool for the design of UV reactors. However, the validation of the hydraulics predicted by the CFD model remains a point of attention. Using standard turbulence models such as the k-e{open} model, the CFD model often wrongly predicts local flow features around a UV lamp. Therefore, more advanced modelling approaches such as the LES model were considered. The modelling approaches were explored for a single cross-flow UV lamp. It is shown by means of comparison with experimental data that the LES model predicts the flow around a UV lamp more precisely than the k-e{open} model. The impact of differences in resolved velocity fields on the predicted disinfection was also investigated. Depending on the local geometry (presence and positioning of baffles) the disinfection results were completely different for the different modelling approaches.

Original languageEnglish
Pages (from-to)528-536
Number of pages9
JournalChemical Engineering Journal
Volume162
Issue number2
DOIs
Publication statusPublished - 1 Aug 2010

Keywords

  • CFD
  • Dose distribution
  • K-e{open} model
  • Large-eddy simulation
  • Turbulence modelling
  • UV disinfection

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