Experimental study on the flow mixing in T-junctions with an impeller
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Experimental study on the flow mixing in T-junctions with an impeller
- 发表刊物：
- Physics of Fluids
- 摘要：
- A good understanding of the mixing mechanism of hot and cold fluids in T-junctions is of great importance in ensuring the safe operation of T-junction piping systems. An impeller is added to T-junction ducts, and experiments are conducted using particle image velocimetry without considering the temperature difference between two fluids. The velocity field, vorticity field, and impeller speed are obtained for blade numbers N-p = 3 and 4 at different momentum ratios (M-R). When the impeller rotates passively in T-junctions under the impact of a branch jet, the values of M-R required to initiate impeller rotation are M-R = 0-0.5 for N-p = 3 and 0-0.125 for N-p = 4. However, an impeller with two blades cannot rotate at any momentum ratio. The relationship between the rotation speed and the flow rates of the main and branch fluids is obtained. An impeller with three blades rotates at a non-uniform speed, while that with four blades rotates uniformly. The jet flow pattern in T-junctions is converted from the impinging jet to the deflecting jet at M-R >= 0.1. The average and root-mean-square velocity are essentially the same for a given momentum ratio, whereas the impeller speed increases with increasing flow rate for the main and branch ducts. As the momentum ratio decreases, the impeller speed also increases. For an impinging jet, the addition of an impeller effectively reduces the velocity fluctuation area and transfers the zone of the highest velocity fluctuation from the bottom wall to the middle of the main duct.
- 合写作者：
- Yuzhuo Yin, Kexin Huang, Bo Su, Mei Lin, Qiuwang Wang
- 卷号：
- 36(2）
- 页面范围：
- 025110
- 是否译文：
- 否
- 发表时间：
- 2024-02-01