Paper
矩形自然循環ループにおける流れの不安定性
- 不安定領域に対する傾斜角度と冷却水温の影響 -
2007 年 19 巻 1+2 号 p. 29-35
詳細
2007 年 19 巻 1+2 号 p. 29-35
The flow instability in a rectangular natural convection loop was investigated focusing on its displacement angle and the cooling water temperature.Unstable chaotic temperature oscillation with flow reversal has occurred in silicone oils KF96-1 & -2 as well as in water, but in the case of water (cooling water temperature Tc=30°C) the unstable state starts at the transitional region from laminar to turbulent, while in the case of silicone oils (Tc=20 & 30°C) it does after the laminar becomes turbulent. It has been found that on the effect of displacement angle θ0 the unstable state occurs in | θ0 | <2°, narrow relatively to in the case of a toroidal loop, and that on the effect of cooling water temperature, the lower it is, the narrower the region of unstable flow.
