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- Politecnico di Milano
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- Energy Engineering
- Subject
- Heat and Mass Transfer Scambio Termico e di Massa
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- Notes · Complete set
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NotesComplete set
Heat Mass Transfer
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Heat and Mass Transfer Scambio Termico e di MassaComplete set
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RADIA TIONHEATTRANSFER Radiation>linkedto>Internalenergy>Temperature &itisdescribedusingElectroMagneticTheory>ElectroMagneticWaves T2>OK reflection EmissionRadiation: f * Emission(RadiationLeavingA surface)(changeU)LABS *Irradiation(RadiatinArrivingonAcurface( T1 @KMotrans Absorption(changev) Reflection(doesn'tchangeu) ᶖ Transmission(doesn'tchangeu) *isnotalwayspresent,wecanclassifythematteras: *Semitransparent *Transmissinispresent,andRadiationHeattransferisavolumetric Phenomena *Opaque*NoTransmissin,thenwecanmodelthebodyasaSurfacephenomena wehavetobeabletodescribetheavantifies *EnergytransferbyRadiation(electromagneticwaves) *Emission #Absorption IrradiationE*Reflection *Transmission EnergytransferbyRadiation *Sinceradiationiscomplex-> wedonotconsiderTransientphenomena-DTheninsteadof EnergywetalkaboutPowerTransfer *Radiationisan E. M.Wave * foron E. MWavetravelinginVacuumwehavethefallowingVectors aelectricVector( PointingVector(ithis2importantFeatures: ( IEx== *leadsinthedirectinoftheE.M.WavesX (physical)--*Representsthepowertransferperunitareaperpendicular- B magnetica to·amountofenergythatcrossesthatare *letsnameitQ= Q(Direction,x) electromagneticspectrum: isclassifyasfollow wavelengthX=um] 3Notallthepossibleradiationincreasesthe 2Frequency[Hz] InternalenergyUC *speedofLightinVacuum[m/s] W only: * *ThermalRadiation: X-(151- 102)um *Visible X- (0,4- 0.7)um *infrared X- +(0.7- 102) weareinterestedinthepowerTransfer: i Ed- direction- aZ P - ifwewanttoknowwhatistheamountofenergyleavinginthat· pointing26 Vectordirectionwehavetoidentifythedirectionandthebestoptio X ·istousesplenicalcoordinates dA-Y ...ThenifpowertransferdependsonDirectionitmeasitdependsonand4 ①ZenitalAngle G-DAzimuthalAngle- * RadiationIntensity…
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