Experimental study of a non-isothermal wall jet issued by a displacement ventilation system

Publication date: August 2013
Source:Building and Environment, Volume 66
Author(s): Iman Fatemi , Bing-Chen Wang , Mike Koupriyanov , Brad Tully
This paper reports a new set of experimental data and presents an in-depth analysis of the flow physics of a non-isothermal jet stream produced by a large quarter-round corner-mounted displacement diffuser. The air velocity, temperature and turbulence intensity inside the displacement ventilation (DV) jet have been thoroughly analyzed and compared with the reported findings of previous studies and model predictions. Through the experiment, it is observed that the DV jet development is significantly altered by buoyant forces and can be divided into four distinctive zones. The results of the present study refine the physical understanding of the coupled thermal-fluid fields characteristic of a DV jet stream, and are useful for improving the design of the DV system tested.