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Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts.

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Presentation on theme: "Free Convection in a Light Bulb. The model solves for the temperature distribution and the flow field inside a light bulb Axisymmetric model, accounts."— Presentation transcript:

1 Free Convection in a Light Bulb

2 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

3 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

4 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

5 Free Convection in a Light Bulb The filament heats rapidly over the first seconds Pictures shows temperature over the first 10 seconds t=2st=6st=10s

6 Free Convection in a Light Bulb t=2st=6st=10s Induces a flow driven by natural convection Pictures shows velocity field over the first 10 seconds

7 Free Convection in a Light Bulb Temperature on the boundary heats slowly

8 Free Convection in a Light Bulb Radiative heat flux on the outer boundary

9 Free Convection in a Light Bulb


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