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Exercice 2 : R partition des temp ratures dans l ' l ment cylindrique d'un r acteur nucl aire Un l ment de combustible nucl

Exercice 2 : Rpartition des tempratures dans l'lment cylindrique d'un racteur nuclaire Un lment de combustible nuclaire est caractris par sa conductivit thermique suppose constante o =30 W. m -1. K -1(dioxyde d'uranium) et par sa puissance calorifique volumique p =640 MW. m-3. La surface externe de l'lment est maintenue la temprature T =450 K.0=16 mm. Montrer que la loi de rpartition 2. L'lmentamaintenantlaformed'untubecylindriquederayonextrieurR =16mmetde 1. L'lment est un cylindre homogne de rayon R des tempratures en tout point de l'lment, la distance r de l'axe, est de la forme T(r)= a - br2 On calculera les coefficients a et b. Que reprsente a?0 rayon intrieurRi. La surface intrieure de ce tube est suppose

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