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6 . 3 . Una part cula de carb n pulverizado arde en aire a y temperatura 1 1 4 5 K y presi n

6.3. Una partcula de carbn pulverizado arde en aire a y temperatura 1145K y presin atmosfrica. El proceso est limitado por la difusin del contra flujo de oxgeno al CO2 y CO que se forman en la superficie. La reaccin es de acuerdo
4C+3O22CO+2CO2
Suponer que el carbn es puro con una densidad de 1284kgcm3 y que la partcula es esfrica con un radio inicial de 0.024cm. A varios dimetros de distancia de la esfera hay aire (20.3% mol de oxgeno). Bajo las condiciones del proceso de combustion, puede suponerse que la difusividad del oxgeno en la mezcla de gases es de 1.310-4m2s. Determinar el tiempo que se necesita para reducir el radio a 0.0057cm.
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