Numerical Investigation of the Near FieldZone Flow Behavior of Isothermal CornerImpinging Jet Ventilation Using CFD

Abstract: Abstract The impinging jet ventilation's importance in providing better air distribution and energy-efficient operation, as well as both its heating and cooling flexibility potential cannot be overemphasized. This is because acceptable indoor air quality and its environmental conditions are essential to occupant’s wellbeing, comfort, productivity, and improved cognitive function. Poor air quality conditions could result in sick building symptoms (SBS) and several studies have investigated that the prevalence of sick building symptoms is associated with indoor air quality. Consequently, to the need for high ventilation effectiveness, the impinging jet ventilation system has been developed and applied in different types of buildings as a new ventilation strategy and concept within the last two decades. Therefore, it is important to continuously develop inventive air distribution systems such as IJV with a better location and terminal configuration of the supply device to adequately provide an acceptable indoor environment in an energy-efficient manner. This study aims at reaching a comprehensive understanding of the near field zone of an isothermal turbulent corner impinging jet in a room by using computational fluid dynamics (CFD) simulation tool. Thus, directly investigating the flow field involving the velocity magnitude, velocity decay, and spreading rate along the diagonal of the room.The cases carried out consist of 12 different three-dimensional modeled configurations (room) of the computational domain with the dimension 7.0 (L) x 7.0 (W) x 2.67 (H) m. The cases which comprised different aspects of diffuser geometry (triangle, quadrant, square), diffuser area, discharge height, and flow rates, used the RNG k-ε turbulence model to solve the turbulence flow.The result obtained, from the parametric study in all the cases was detailed to analyze the effect of the different flow rate, discharge heights, diffuser geometry, and its area on the velocity profile development, velocity decay, and spreading rate along the diagonal of the room. This study significantly shows the triangular geometries having greater velocity magnitude and velocity decay along all the line profile positions. Interestingly, a comparison between the quadrant and square geometry illustrates that their characteristics of generating a greater velocity magnitude depend on its discharge height. The result also demonstrated a decrease in jet velocity decay with an increase in jet discharge height. With similar jet spread at higher jet discharge, the square geometry exhibited a higher spreading rate at lower discharge height.