Abstract
Trajectory and configuration of heated air cloud which was injected from an air conditioner were examined experimentally. In order to heat the ankle of the human body, heated air cloud was tried to be injected from an air-conditioner by pulsed way. Air cloud formulated a vortex ring and moved straight by keeping its configuration. Temperature distribution in the cloud was also examined experimentally by infrared camera. The thermal energy was spread out when it collided the wall. A pair of air cloud moved near and near after injection and united each other. The diameter changed vertically and horizontally after the collision.
