201 加熱回転円板上流れにおける温度・速度の測定

抄録

The measurements of temperarure and velocity distributions near a heated rotating disc were conducted using the Laser Induced Fluorescence (LIF) technique and the Particle Image Velocimetry (PIV). We found that vortices appeared on the disc in the natural convection dominant region and were classified into three types (Wave, Normal, and Plume type).
Then we investigated the characteristics of these three types of vorteces. First, we found that these three types of vortices have nearly the same influence on heat conduction, because temperature gradient in the vertical direction near the wall are almost the same. On the other hand, the maximum velocity in the vertical direction is different from each other. Moreover, turbulent heat flux in the vertical direction of each type has a different value, where Wave type has the minimum and Plume type has the maximum. Hence these three types of vortices are thought to have different influence on the heat transfer.