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**Free Convection in a Light Bulb**

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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 for conduction, convection, radiation and nonisothermal flow Model shows how to model free convection, how to treat ideal gasses, and how to model radiation

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**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

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**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

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**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

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**Free Convection in a Light Bulb**

Induces a flow driven by natural convection Pictures shows velocity field over the first 10 seconds t=2s t=6s t=10s

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**Free Convection in a Light Bulb**

Temperature on the boundary heats slowly

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**Free Convection in a Light Bulb**

Radiative heat flux on the outer boundary

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**Free Convection in a Light Bulb**

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