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LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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3/14/2003<br />

Variaţia temperaturilor<br />

numai în timp<br />

o La momentul t când flui<strong>de</strong>le au temperaturile T 1 şi<br />

T 2 , cantitatea <strong>de</strong> căldură <strong>transfer</strong>ată într-un<br />

interval infinitezimal <strong>de</strong> timp dt este:<br />

o Cantitatea <strong>de</strong> căldură dQ:<br />

( T T ) dt<br />

dQ K ⋅ A⋅<br />

− ⋅<br />

= 1 2<br />

<strong>–</strong>este cedată <strong>de</strong> fluidul cald (1), a cărui temperatură<br />

sca<strong>de</strong> cu dT1, <strong>–</strong> este primită <strong>de</strong> către fluidul rece (2), a cărui<br />

temperatură creşte cu dT2: (238)<br />

<strong>LUCIAN</strong> <strong>GAVRILĂ</strong> <strong>–</strong> <strong>Fenomene</strong> <strong>de</strong> <strong>transfer</strong> <strong>II</strong> 50

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