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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 />

Transfer global <strong>de</strong> căldură<br />

direct între două flui<strong>de</strong><br />

o În cazul turnurilor cu picurare<br />

ecuaţia Ranz <strong>–</strong> Marshall:<br />

K ⋅l<br />

Nu = = 2 +<br />

λ<br />

0,<br />

6<br />

Re<br />

0, 50<br />

Pr<br />

0,<br />

33<br />

(283)<br />

ovalabilă pentru intervalul 0 < Re < 200,<br />

o lungimea caracteristică l = diametrul mediu al<br />

picăturilor <strong>de</strong> apă,<br />

o v (din criteriul Re) = viteza relativă a picăturilor<br />

<strong>de</strong> apă.<br />

<strong>LUCIAN</strong> <strong>GAVRILĂ</strong> <strong>–</strong> <strong>Fenomene</strong> <strong>de</strong> <strong>transfer</strong> <strong>II</strong> 91

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