Free Convection in a Light Bulb

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Presentation transcript:

Free Convection in a Light Bulb

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

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

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

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

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

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

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

Free Convection in a Light Bulb

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