Coanda effect

Air-supplied ceiling radiant air conditioning is expected to become more popular in Japan in the future because there is no leakage from pipes and no condensation on the surfaces of radiant panels. Coanda air conditioning, a type of air-supplied ceiling radiant air conditioning, uses the Coanda effect, which is the tendency a fluid passing near a wall to maintain contact with it. As used commonly, Coanda air conditioning cools the ceiling surface by blowing airflow horizontally along it from the top of the wall surface and cooling by radiation1).

This paper focuses on the performance of a new air curtain ventilation system. Particle Image Velocimetry (PIV) is used to visualize and investigate the airflow characteristic of an air curtain in an enclosure and the airflow pattern and temperature fields are measured and analyzed in detail. The air supply velocity and the slot inlet location were varied during the experimental process. The current results show that with the increase of air supply velocity the cooling effect in the occupied zone is further strengthened.