The present paper describes the flow characteristics of air injected from a slit nozzle into a rectangular container. The effect of the slit nozzle offset amount and the jet air velocity on the flow in the container was examined experimentally. The velocity distribution was measured by a particle image velocimetry (PIV) system. When the nozzle is located at the center of the container, the downward impinging jet oscillates largely and frequently in the region of container and does not reach the bottom. When the nozzle is off the center, it goes along the container wall due to the Coandă effect. As a result, the recirculation flow in the container is extended downward. As the Reynolds number (the injected air velocity) increases, two areas of recirculation flow are generated in the upper and lower regions of container. Therefore, the jet does not adhere to the container wall up to the bottom.
