LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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3/14/2003 Transfer global de căldură la potenţial termic constant o Fluxul termic transferat prin filmul de fluid (1) are expresia: o Fluxul termic transferat prin peretele solid are expresia: ( ) T T Q = α ⋅ A ⋅ − s1 1 1 p1 λ = δ ( ) T T Q ⋅ A⋅ − s2 p1 p2 (212) (213) LUCIAN GAVRILĂ – Fenomene de transfer II 12
3/14/2003 Transfer global de căldură la potenţial termic constant o Fluxul termic transferat prin filmul de fluid (2) are expresia: Q ⋅ A ⋅ s3 2 p2 ( ) T − T = α (214) oDacă se consideră regimul staţionar: Q = = s1 = Q Q s2 s3 oDacă procesul de transfer de căldură decurge la temperaturi nu prea ridicate, transferul radiant se poate neglija. LUCIAN GAVRILĂ – Fenomene de transfer II 13 2 Q s (215)
Page 1 and 2: 3/14/2003 TRANSFERUL GLOBAL DE CĂL
Page 3 and 4: 1 1 - transfer convectiv prin filmu
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Analiza coeficientului global de 3/
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LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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