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LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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3/9/2003<br />

CONDENSAREA VAPORILOR<br />

o La curgerea cu viteză constantă, cele trei<br />

forţe sunt în echilibru:<br />

( f df ) f<br />

ρ gdV + + =<br />

o Notând cu F forţa <strong>de</strong> frecare pe unitatea<br />

<strong>de</strong> suprafaţă şi ţinând cont <strong>de</strong> faptul că<br />

aria pe care acţionează forţele <strong>de</strong> frecare<br />

este A = dx.1, ecuaţia (176) <strong>de</strong>vine:<br />

( F dF ) dx Fdx<br />

ρ gdV + + =<br />

(176)<br />

(177)<br />

<strong>LUCIAN</strong> <strong>GAVRILĂ</strong> <strong>–</strong> <strong>Fenomene</strong> <strong>de</strong> <strong>transfer</strong> <strong>II</strong> 23

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