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CarbonParticleCombustionEPME525SP2011

# CarbonParticleCombustionEPME525SP2011 - Carbon Particle...

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1 Carbon Particle Combustion One-Film Model Example Problem ME 525 SP2011 Consider a burning carbon particle. Analyze the process using the one-film model. The particle diameter is 20 microns (20x10 -6 m). The burning rate of the carbon particle (diagram on next page) is given by   2, 2, 2, 4 ln 1 1 O O s C s g g O s Y Y m r Y D 2 1 2, 2 4 2 C mix C s O s O u s MW MW P m r k Y MW R T Assume that the burning process is quasi-steady and that the particle temperature is uniform. Evaluate g at the particle surface temperature, assume that 2 mix O MW MW , and use the following properties: 1900 s T K , 4 2 10 / g m s D , 0.128 / g k W m K , 1 20 / k m s , 800 T K 0 0 0 , ( ) , 2( ) , 2( ) 1900 1900 0 / , 1900 396,000 / f C s f O g f CO g h K h K kJ kmol h K kJ kmol   Assume that the surface reaction is given by ( ) 2( ) 2 1 1 s g kg C kg O kg CO , and that the oxidizer is air. (a) Calculate the burning rate C m . This will involve an iterative process. The first step in the process is to assume that the oxygen mass fraction at the surface is zero and then

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CarbonParticleCombustionEPME525SP2011 - Carbon Particle...

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