Influence of Rectifier Nozzles on the Flow Distribution Characteristics of Parallel Pipes
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experiment System
2.2. Mathematical Model
2.2.1. Governing Equation
2.2.2. Numerical Method and Boundary Conditions
2.2.3. Meshing
2.3. Model Validation
3. Results
3.1. Velocity Distribution of Each Branch
3.2. Pressure Distribution of Each Branch
3.3. Discharge Coefficients of Rectifier Nozzles with 7.3 mm
4. Discussion
4.1. Effect of Temperature on Flow Distribution
4.2. Effect of Inlet Flow on Flow Distribution
4.3. Effect of Cavitation on Flow Distribution
4.4. Evaluation of Distribution Effect
5. Conclusions
- (1)
- The rectifier nozzle can prevent the flow field of each branch pipe from being distorted during the shunting process, so that the velocity and pressure distribution of the parallel pipes are more uniform and stable. Uniformity is obtained by increasing the resistance loss. For every 1% increase in uniformity, the pressure loss will increase by about 4% for rectifier nozzle.
- (2)
- As the inlet flow rate increases, the degree of uneven flow distribution increases. The rectifier nozzle effectively improves the unevenness of the flow distribution of the parallel pipeline.
- (3)
- At the same inlet flow rate, as the temperature rises, the degree of uneven flow distribution slightly decreases.
- (4)
- In this study, parallel pipes with rectifier nozzles were considered. Mild cavitation occurred in which the bubbles were small and scattered, and the flow distribution of the parallel pipelines was found to be relatively uniform, with only a slight difference.
Author Contributions
Funding
Conflicts of Interest
References
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Parameter. | Unit | Uncertainty (%) |
---|---|---|
Mass flow rate | t/h | 0.5 |
Pressure | KPa | 0.08 |
Fluid temperature | °C | 2.19 |
Temperature (°C) | Density (kg/m3) | Viscosity (Pa-s) × 103 |
---|---|---|
23.0 | 997.54 | 0.9321 |
40.0 | 992.22 | 0.6527 |
60.0 | 983.20 | 0.4660 |
Number of Cell | Velocity of out1 (m/s) | Velocity of out2 (m/s) | |
---|---|---|---|
0.75 million | 4946 | 0.435 | 0.453 |
1.6 million | 4965 | 0.432 | 0.453 |
2.7 million | 4950 | 0.432 | 0.453 |
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Yang, Z.; Cao, Y.; Zhang, Q.; Wu, F.; Shi, S.; Zhao, S.; Zhan, H. Influence of Rectifier Nozzles on the Flow Distribution Characteristics of Parallel Pipes. Water 2020, 12, 2558. https://doi.org/10.3390/w12092558
Yang Z, Cao Y, Zhang Q, Wu F, Shi S, Zhao S, Zhan H. Influence of Rectifier Nozzles on the Flow Distribution Characteristics of Parallel Pipes. Water. 2020; 12(9):2558. https://doi.org/10.3390/w12092558
Chicago/Turabian StyleYang, Zhendong, Yalong Cao, Qiaoling Zhang, Feng Wu, Suqi Shi, Simao Zhao, and Hui Zhan. 2020. "Influence of Rectifier Nozzles on the Flow Distribution Characteristics of Parallel Pipes" Water 12, no. 9: 2558. https://doi.org/10.3390/w12092558