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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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Science Starter Turn to the next blank page in your ISN and cut and paste the handout that is located on the front desk. You will need colored pencils.

Science Starter Turn to the next blank page in your ISN and cut and paste the handout that is located on the front desk. You will need colored pencils.

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