RADIATION AND COMBUSTION PHENOMENA

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RADIATION AND COMBUSTION PHENOMENA PROF. SEUNG WOOK BAEK DEPARTMENT OF AEROSPACE ENGINEERING, KAIST, IN KOREA ROOM: Building N7-2 #3304 TELEPHONE : 3714 Cellphone : 010 – 5302 - 5934 swbaek@kaist.ac.kr http://procom.kaist.ac.kr TA : Jonghan Won ROOM: Building N7-2 # 3315 TELEPHONE : 3754 Cellphone : 010 - 4705 - 4349 won1402@kaist.ac.kr

RADIATIVE HEAT TRANSFER RADIATIVE EQUILIBRIUM INCIDENT RADIATION G R : ABSORPTIVITY T A : REFLECTIVITY : TRANSMISSIVITY OPAQUE SURFACE TRANSPARENT SURFACE PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE EQUILIBRIUM FOR AN OPAQUE SURFACE REFLECTION MODELS PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE EQUILIBRIUM HEAT FLUX FOR OPAQUE SURFACE G B     E : RADIOSITY (NO RELATION TO MAGNETIC FIELD) : IRRADIATION OPAQUE PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE EQUILIBRIUM AN OPAQUE BODY IN AN INSULATED ENCLOSURE UNDER EQUILIBRIUM, THE FIRST LAW YIELDS , OR PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE EQUILIBRIUM By Definition   : Emissivity is a measure of how well a body can radiate energy as compared to a blackbody Under Equilibrium : Kirchhoff’s Law PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE EQUILIBRIUM ALSO ELIMINATE , OR UNDER EQUILIBRIUM (OR ADIABATIC) PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER PART II. RADIATIVE NON-EQUILIBRIUM ENCLOSURE RADIATION PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM EXAMPLE APPLICATION TO THERMOS BOTTLE ANY EFFECT OF CONVECTION? EQUIVALENT CONDUCTION INSULATION thick cork is needed!!! PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM OPTICAL APPROACH IS HOPELESS FOR ENCLOSURES INVOLVING MORE THAN THREE SURFACES NEED ANOTHER APPROACH !!! TWO METHODS… ELECTRICAL ANALOGY NET RADIATION METHOD PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM ELECTRICAL ANALOGY (RADIATION NETWORK METHOD) TWO CIRCUIT ELEMENTS (RESISTANCES) SURFACE (COLOR) VOLUME (VIEW) SURFACE ELEMENT PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM 2. VOLUME ELEMENT FOR ENERGY LEAVING A SURFACE IF I IS ISOTROPIC PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM VIEW FACTOR A FRACTION OF TOTAL ENERGY LEAVING SURFACE INTERCEPTED BY SURFACE ENERGY FROM ENERGY FROM TO PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM BY DEFINITION HERE WITH PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM SIMILARLY WHICH LEADS TO THE RECIPROCITY RELATION CONSEQUENTLY, THE RECIPROCITY RELATION BETWEEN AND PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM BETWEEN AND AND BETWEEN AND FOR AN ENCLOSURE PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM NOW, BACK TO THE VOLUME ELEMENT!!! CONSIDER TWO SURFACES, SAY AND , OF AN ENCLOSURE RADIATION FROM TO RADIATION FROM TO PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER

RADIATIVE HEAT TRANSFER RADIATIVE NON-EQUILIBRIUM NET RADIATION (HEAT FLUX) BETWEEN AND BY RECIPROCITY THEN OR PROPULSION AND COMBUSTION LABORATORY RADIATIVE HEAT TRANSFER