Experimental studies on the air flow characteristics induced by a high sidewall grill in a climate chamber

Wan Ki Chow, Ling Tim Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


The air flow characteristics induced by discharging air into a climatechamber with and without a high sidewall grill were studied experimentally. Over five hundred and thirty thousand values of the air speed were collected at positions above the floor level, near the supply inlet and the exhaust outlet. The thermal comfort indices due to temperature and air speed were measured under five flow conditions, two with a diffuser and three without a diffuser. An evaluation of thermal comfort using the air diffusion performance index (ADPI) and percentage dissatisfied (PD) was made. Macroscopic numbers describing the air flow studied were, the Archimedes number, the Reynolds number and the jet momentum number. The Reynolds number and the jet momentum number increased as the total supply flow rate increased. However, the Archimedes number decreased with increasing flow rates. The Archimedes number was found to be correlated with the Reynolds number, which might be because they are defined by parameters related to the air velocity V and temperature difference (T2- T1). The ADPI was found to be linearly related to the jet momentum number and related directly to the PD. The throw of the diffuser was found to be related to the corrected Archimedes number. The jet momentum number and Archimedes number are related to the air speed, the root mean square of the air speed and the turbulence intensity.
Original languageEnglish
Pages (from-to)82-98
Number of pages17
JournalIndoor and Built Environment
Issue number2
Publication statusPublished - 1 Dec 1996


  • Archimedes number
  • Climate chamber
  • Reynolds number
  • Rflow
  • Sidewall grill

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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