Radiation 2
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Transcript of Radiation 2
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Radiation Heat Transfere = emissive powerG = total irradiationJ = total radiosityIn general:Opaque material:a = absorptivityr = reflectivityt = transmissivitye = emissivitya=e
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lelEnergyIdeal EmitterSchematicT3> T2> T1
- Radiation Heat TransferBlack Bodyabsorptivity = a=1emissivity = e=1ideal emissive power = ebGray Bodyabsorptivity < 1emissivity < 1emissive power
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lelEnergySchematic
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Radiation Heat TransferThermal EquilibriumView Factor: Fij = fraction of radiation from surface i intercepted by surface j.
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Radiation Heat TransferNo net heat flux wallAnalog circuitFind:
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Radiation Heat Transfer
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Radiation Heat Transfer
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Radiation Heat Transfer
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Radiation Heat Transfer
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Radiation Heat TransferConsider the radiation heat transfer between two infinite parallel plates.Special Case
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Radiation Heat TransferConsider the radiation heat transfer between a small object and infinite surroundings.1SSpecial Case