Trajectory of a Horizontally Diffused Plane Wall Jet in a Non-isothermal Ceiling Slot-ventilated Enclosure

Indoor air quality can be improved according to the airflow pattern in a confined enclosure which is controlled by the trajectory of diffused air-jet. A theoretical equation describing the trajectory of horizontally diffused plane wall jet in a non-isothermal ceiling slot-ventilated enclosure was derived in this study. Archimedes number was demonstrated to be the dominant variable for the trajectory of plane wall jet. The vertical displacement y was proportional to x5/2, the horizontal displacement in the trajectory of a plane wall jet. Both the devised model and the model by Etheridge and Sandberg (1996, Building Ventilation: Theory and Measurement. John Wiley & Sons Ltd., West Sussex, England) were compared with test data from previous research. The results of the comparisons between these two models showed that the model derived from this study with a smaller value of means squared prediction error is a better predictor for the trajectory of a plane wall jet.