抄録
This study investigates the flow field in a flow channel with finger-stacked structure (FSS), which was proposed as a heat transfer promoter for Flibe blanket, by means of PIV measurement matching refractive indices of the channel material and working fluid. The experimental results revealed that turbulence energy was generated in the large velocity shear regions formed behind the fingers, and transported downstream. Then, when the gap between the fingers and channel wall was adjusted to 1 mm, the stagnant region behind the fingers that appeared in the case of 0 mm gap disappeared. In addition, turbulence energy was newly generated from the tips of the fingers. From these results, high heat transfer promotion is expected in the whole heating surface area of the flow channel with FSS setting small gap.
