The characteristics of wall confluent jets for ventilated enclosures

This paper reports experimental measurements on the diffusion of confluent jets that form a wall jet. The experiments were carried out at a fixed air flow rate and fixed temperature difference between the supply and room air in the cooling mode. Based on these experiments, the results presented show the behaviour of the wall confluent jet in the form of velocity profiles, the spreading ratio of jet on the wall, etc. The empirical equations derived are compared with other types of air jets, such as the free confluent jet, free plane wall jet, and free plane jet. It is concluded that the wall confluent jet has a better self preservation characteristics than other types of air jets. The flow field of the wall confluent jet is classified into three regions: Free jet region, Coanda effect region, Wall jet region.