An Experimental Study on the Transportation Characteristics of Perfluoro(2-methyl-3-pentanone) in a Straight Pipe
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Pressures and Temperatures in the Discharge System
3.2. Transportation Characteristics of C6F12O in the System
3.2.1. Variations in the Vessel
3.2.2. Variations in the Pipe
3.3. Effect of the Filling Pressure on the Flow Behaviors of C6F12O
3.4. Effect of the Filling Density on the Flow Behaviors of C6F12O
4. Conclusions
- Under the driving of pressurized nitrogen, the C6F12O was sprayed out of the pipe very rapidly. In the process of just a few seconds, the agent in the pipe experienced complex changes within the three stages of “gas, gas-liquid mixture and gas”. The intermediate stage exhibited characteristics of gas-liquid two-phase flow, which is where the fluid was dominated by liquid C6F12O together with a small amount of vapor and nitrogen;
- Upon the release of C6F12O, the pressure in the vessel went steadily downward until it reached zero, while the vessel temperature just showed a minor drop of several degrees Celsius. The pipeline pressure plots exhibited an asymmetric hump shape, which contained three stages of “rapid increase, gentle decrease and continuous decrease”. In the first two stages, the piping temperature remained stable. However, a big drop of about 30 °C in the piping temperature occurred in the third stage of gas discharge;
- In comparison to that of the CF3Br released under similar conditions, the temperature and pressure curves of C6F12O exhibited similar trajectories, but with much lower varying amplitudes. Moreover, such differences can be mainly ascribed to their different vapor pressures and boiling points;
- With other conditions being the same, raising the filling pressure in the vessel of the C6F12O reduced the discharge duration and the pipeline temperatures. Increasing the filling density extended the discharge duration, but showed little influence on the pipeline temperatures.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Test Sequence | Agent | Agent Mass (kg) | Filling Density (kg·m−3) | Filling Pressure (kPa) |
---|---|---|---|---|
1 | C6F12O | 2.01 | 517 | 1822 |
2 | CF3Br | 2.02 | 519 | 1846 |
3 | C6F12O | 2.12 | 545 | 1910 |
4 | C6F12O | 2.08 | 535 | 2540 |
5 | C6F12O | 2.14 | 550 | 3230 |
6 | C6F12O | 1.02 | 262 | 1799 |
7 | C6F12O | 2.05 | 527 | 1812 |
8 | C6F12O | 3.02 | 776 | 1813 |
Agent | Molecular Weight | Boiling Point (°C) | Vapor Pressure (kPa) | Liquid Density (kg·m−3, 22 °C) |
---|---|---|---|---|
C6F12O | 316 | 49.2 | 40 | 1.60 |
CF3Br | 149 | −57.8 | 1620 | 1.57 |
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Ni, X.; Chen, Y.; Huang, Q.; Zhao, C.; Li, S.; Huang, J.; Wang, J. An Experimental Study on the Transportation Characteristics of Perfluoro(2-methyl-3-pentanone) in a Straight Pipe. Fire 2023, 6, 156. https://doi.org/10.3390/fire6040156
Ni X, Chen Y, Huang Q, Zhao C, Li S, Huang J, Wang J. An Experimental Study on the Transportation Characteristics of Perfluoro(2-methyl-3-pentanone) in a Straight Pipe. Fire. 2023; 6(4):156. https://doi.org/10.3390/fire6040156
Chicago/Turabian StyleNi, Xiaomin, Ye Chen, Qiurui Huang, Chenxi Zhao, Songyang Li, Jiahui Huang, and Jian Wang. 2023. "An Experimental Study on the Transportation Characteristics of Perfluoro(2-methyl-3-pentanone) in a Straight Pipe" Fire 6, no. 4: 156. https://doi.org/10.3390/fire6040156