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LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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 />

în timp şi în spaţiu<br />

o Pentru un interval <strong>de</strong> timp suficient <strong>de</strong> mic,<br />

dt, <strong>transfer</strong>ul termic <strong>de</strong>curge în regim<br />

staţionar.<br />

o În intervalul dt, între flui<strong>de</strong> se <strong>transfer</strong>ă<br />

cantitatea <strong>de</strong> căldură dQ.<br />

o Cantitatea <strong>de</strong> căldură cedată <strong>de</strong> fluidul cald<br />

(1) este:<br />

dQ −m<br />

⋅ c ⋅ dT ⋅ p<br />

= 1 1 1<br />

dt<br />

(247)<br />

<strong>LUCIAN</strong> <strong>GAVRILĂ</strong> <strong>–</strong> <strong>Fenomene</strong> <strong>de</strong> <strong>transfer</strong> <strong>II</strong> 60

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