Modeling human exposure to particles in indoor environments using a drift-flux model

Gao Naiping, Jianlei Niu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

This study developed a drift-flux model for particle movements in turbulent indoor airflows. To account for the process of particle deposition at solid boundaries in the numerical model, a semi-empirical deposition model was adopted in which the size- dependent deposition characteristics were well resolved. After validation against the experimental data, the drift-flux model was used to investigate human exposures to particles in three normally-used ventilation types: mixing ventilation (MV), displacement ventilation (DV), and under-floor air distribution (UFAD). The movements of submicron particles were like tracer gases while the gravitational settling effect should be taken into account for particles larger than 2.5 um. For particles released from an internal heat source, the concentration stratification of small particles (diameter <10 um) in the vertical direction appeared in DV and UFAD. It was found the advantageous principle for gaseous pollutants that a relatively less- polluted occupied zone existed in DV and UFAD was also applicable to small particles.
Original languageEnglish
Title of host publicationIBPSA 2007 - International Building Performance Simulation Association 2007
Pages837-843
Number of pages7
Publication statusPublished - 1 Dec 2007
EventBuilding Simulation 2007, BS 2007 - Beijing, China
Duration: 3 Sep 20076 Sep 2007

Conference

ConferenceBuilding Simulation 2007, BS 2007
CountryChina
CityBeijing
Period3/09/076/09/07

Keywords

  • Displacement ventilation
  • Drift-flux model
  • Exposure
  • Mixing ventilation
  • Particle
  • Under-floor air distribution

ASJC Scopus subject areas

  • Computer Science Applications
  • Building and Construction
  • Architecture
  • Modelling and Simulation

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