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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 Răcirea apei cu aer în turnuri <strong>de</strong> răcire<br />

o În cazul turnurilor peliculare<br />

ecuaţia criterială Nesterenko <strong>–</strong> Guchmann:<br />

K ⋅l<br />

Nu = = 2 +<br />

λ<br />

1,<br />

05<br />

Re<br />

0,<br />

50<br />

0,<br />

33<br />

Gu<br />

0,<br />

175<br />

ovalabilă pentru 0 < Re < 200<br />

o Prop. fizice care intervin în ecuaţie se iau pt. apă,<br />

o lungimea caracteristică l = grosimea peliculei <strong>de</strong><br />

apă.<br />

Pr<br />

(282)<br />

<strong>LUCIAN</strong> <strong>GAVRILĂ</strong> <strong>–</strong> <strong>Fenomene</strong> <strong>de</strong> <strong>transfer</strong> <strong>II</strong> 90

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