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TRANSFERUL DE CĂLDURĂ - Cadre Didactice

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2/14/2003<br />

DISTRIBUŢIA TEMPERATURILOR<br />

o Dimensional:<br />

[] a<br />

⎡ λ<br />

⎢<br />

⎢ ρ ⋅ c<br />

⎣<br />

ÎNTR-UN MEDIU IMOBIL<br />

⎤<br />

⎥<br />

⎥⎦<br />

=<br />

⎡<br />

⎢<br />

⎣<br />

= −<br />

p<br />

W<br />

( )( ) ⎥<br />

kg ⋅ m<br />

−3<br />

J ⋅ kg<br />

−1<br />

⋅ K<br />

1<br />

s ⎦<br />

o Coeficientul de difuzivitate termică are<br />

aceeaşi unitate de măsură ca şi:<br />

– viscozitatea cinematică, υ,<br />

– coeficientul de difuziune D.<br />

⋅<br />

m<br />

−1<br />

LUCIAN GAVRILĂ – Fenomene de transfer II<br />

⋅<br />

K<br />

−1<br />

⎤<br />

⎥<br />

⎦<br />

=<br />

⎡<br />

⎢<br />

⎣<br />

m<br />

2<br />

⎤<br />

(29)<br />

52

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