Comparison of Displacement and Mixing Diffusers

Z. Jiang, Q. Chen, A. Moser

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)


In order to cumpare the peformance of different supply diffuers of ventilation air, the airflow passern, temperature stratifiation and contaminant dispersion in a furnitured office ventilated by three kinds of air diffuer were numerically investigated. The air diffuers studied in this paper are a quarter‐cylinder displacement diffuer on the floor and mixing diffuers (linear and vortex diffuers) on the ceiling. The heat sources in the of‐fice are considered to be 50% convective and 50% radiative. The k‐ɛ two‐equatwn model of turbulence is employed to predict the turbulent diffusion. The results show that the displacement diffuser provides a rather uniform flow field with low velocify in most areas, and the vertical temperature difference from floor to ceiling is as high as 6 K. With the linear diffuser, the air velociry is high, and the temperature is uniform both horizontally and vertically. The air velocity generated by the vortex diffuser is moderate. The distributions of the temperature and the contaminant are rather uniform.

Original languageEnglish
Pages (from-to)168-179
Number of pages12
JournalIndoor Air
Issue number3
Publication statusPublished - Sept 1992


  • Airflow pattern
  • Displacement diffuser
  • Indoor contaminant
  • Mixing diffuser
  • Numerical simulation
  • Temperature distribution

ASJC Scopus subject areas

  • Environmental Engineering
  • Building and Construction
  • Public Health, Environmental and Occupational Health


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