Cavitation Morphology Study between Hemispherical Textured Rotating Friction Pairs
Abstract
:1. Introduction
2. Modeling Analysis
2.1. Multiphase Model
2.2. Turbulence Model
2.3. Cavitation Model
2.4. Mesh Model
3. Simulation Analysis
3.1. Cavitation under Different Texture Rate
3.2. Velocity Analysis in Cavitation Area
3.3. Pressure Analysis in Cavitation Area
3.4. Mass Transfer Analysis
4. Experiment Analysis
4.1. Experimental Facilities
4.2. Experimental Results
5. Conclusions
6. Patents
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Nomenclature
φ | General scalar of the flow field |
χ | Subscript |
ρ | Fluid density |
ρv | Gas density of gas phase |
NP | phase number |
λ | Volume fraction |
U | Vector velocity |
Γ | Phase diffusion ability |
SM | Mass source |
ωh | Turbulence frequency |
Pk | Incidence of turbulence |
μt | Turbulent viscosity |
μ | Dynamic viscosity |
υ | Kinematic viscosity |
y | Distance near the wall |
Pkb | Buoyant turbulence term |
Pωb | Buoyant turbulence term |
S′ | Strain rate |
λv | Volume fraction of gas phase |
u | Vector velocity of gas phase |
Source term for evaporation and condensation | |
RB | Cavitation bubble radius |
pv | Saturated vapor pressure of liquid |
p | Liquid pressure around the cavitation bubble |
ρf | Liquid density |
ρv | Vapor density |
τ | Coefficient of the surface tension |
F | Empirical correction coefficient |
λnuc | Volume fraction in the nucleation center |
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Parameter | Oil | Vapor |
---|---|---|
Density (kg/m3) | 865 | 0.023 |
Specific heat capacity (J/kg·K−1) | 2093.5 | 1911.6 |
Coefficient of heat conduction (m·K) | 0.12 | 0.0185 |
Dynamic viscosity (Pa·s) | interpolation function | 9.86 × 10−6 |
Saturated vapor pressure (Pa) | 1000 | 1000 |
Scheme | Radial Layer | Circumferential Layer | Number of O-Grid LAYERS | Number of Grids | λυ | |
---|---|---|---|---|---|---|
Texture Area | Non-Texture Area | |||||
1 | 142 | 77 | 124 | 6 | 391,840 | 0.000467 |
2 | 142 | 77 | 124 | 7 | 438,463 | 0.0005012 |
3 | 210 | 121 | 124 | 11 | 988,637 | 0.0006212 |
4 | 210 | 121 | 160 | 11 | 1,607,374 | 0.0006417 |
5 | 210 | 165 | 160 | 15 | 2,017,702 | 0.0006419 |
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Sun, J.; Chen, L.; Zhang, B.; Huang, H.; Qian, P. Cavitation Morphology Study between Hemispherical Textured Rotating Friction Pairs. Lubricants 2022, 10, 249. https://doi.org/10.3390/lubricants10100249
Sun J, Chen L, Zhang B, Huang H, Qian P. Cavitation Morphology Study between Hemispherical Textured Rotating Friction Pairs. Lubricants. 2022; 10(10):249. https://doi.org/10.3390/lubricants10100249
Chicago/Turabian StyleSun, Junyu, Liyu Chen, Bing Zhang, Hua Huang, and Pengfei Qian. 2022. "Cavitation Morphology Study between Hemispherical Textured Rotating Friction Pairs" Lubricants 10, no. 10: 249. https://doi.org/10.3390/lubricants10100249