Development of PIV techniques to measure airflow patterns in ventilated airspaces

Lingying Zhao, Yuanhui Zhang, Xinlei Wang, G. L. Riskowski, L. L. Christianson

Research output: Contribution to journalConference articlepeer-review


A measurement technique based on particle image velocimetry (PIV) to measure quantitatively airflow patterns and distribution in ventilated airspaces is presented. Air laden with helium-filled bubbles was illuminated by a two-dimensional light sheet in a full-scale ventilated room. Images of bubbles visualized in the light sheet were recorded using a photographic camera. Relatively long camera exposure time makes it possible to record the bubble path in the designed time period. Image-shift techniques remove the directional ambiguity. The photographic images were scanned into a computer, and the digitized images were processed automatically using an image-processing program to extract flow-field velocity information. The configuration, working principles, sample results, accuracy, capability, and limitations of the technique are discussed in this paper. This measurement method is part of a larger study of aerosol spatial distribution, ventilation effectiveness, and aerial contaminant control strategies.

Original languageEnglish (US)
Pages (from-to)PART 2/-
JournalASHRAE Transactions
StatePublished - 1999
EventASHRAE Annual Meeting - Seattle, WA, USA
Duration: Jun 18 1999Jun 23 1999

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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