free convection in a light bulb. the model solves for the temperature distribution and the flow...
TRANSCRIPT
![Page 1: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/1.jpg)
Free Convection in a Light Bulb
![Page 2: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/2.jpg)
Free Convection in a Light Bulb
• The model solves for the temperature distribution and the flow field inside a light bulb
• Axisymmetric model, accounts for conduction, convection, radiation and nonisothermal flow
• Model shows how to model free convection, how to treat ideal gasses, and how to model radiation
![Page 3: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/3.jpg)
Free Convection in a Light Bulb
• Tungsten filament approximated with a solid torus to allow modeling in 2d
• Surface-to-surface radiation at interior boundaries
• Surface-to-ambient radiation at outer boundaries
![Page 4: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/4.jpg)
Free Convection in a Light Bulb
• Argon gas treated as an ideal gas
• When the light is turned on, the gas heats and induces a flow
![Page 5: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/5.jpg)
Free Convection in a Light Bulb
• The filament heats rapidly over the first seconds• Pictures shows temperature over the first 10 seconds
t=2s t=6s t=10s
![Page 6: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/6.jpg)
Free Convection in a Light Bulb
t=2s t=6s t=10s
• Induces a flow driven by natural convection• Pictures shows velocity field over the first 10 seconds
![Page 7: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/7.jpg)
Free Convection in a Light Bulb
• Temperature on the boundary heats slowly
![Page 8: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/8.jpg)
Free Convection in a Light Bulb
• Radiative heat flux on the outer boundary
![Page 9: Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts](https://reader036.vdocuments.net/reader036/viewer/2022062320/56649cd85503460f949a0512/html5/thumbnails/9.jpg)
Free Convection in a Light Bulb