Air diffusion terminal devices: Macroscopic numbers describing jet momentum

Wan Ki Chow, Ling Tim Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


Macroscopic flow numbers relating to the jet momentum of air diffusion terminal devices are studied in this paper. Diffuser jet momentum, jet momentum number and jet momentum ratio are reviewed in the literature. New expressions for jet momentum ratios and jet volume numbers are proposed for specifying the mean room air speed in mechanically ventilated enclosures. The proposal is validated against experimental data from seven sites under fifteen operating flow conditions. Two macroscopic flow numbers correlate with the measured mean air speed in the room.
Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalBuilding Services Engineering Research and Technology
Issue number1
Publication statusPublished - 1 Jan 1998

ASJC Scopus subject areas

  • Building and Construction


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