03.07.2013 Views

LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

3/14/2003<br />

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

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

<strong>–</strong> β - coeficientul <strong>de</strong> evaporare (m/s);<br />

<strong>–</strong>Dg- coeficientul <strong>de</strong> difuziune (m2 /s);<br />

<strong>–</strong> νg - viscozitatea cinematică a gazului (m2 /s).<br />

o În cazul răcirii apei, prin curgere peliculară<br />

printre canale prin care trece aer<br />

*<br />

Prg ( = 0,63), se poate utiliza relaţia<br />

simplificată:<br />

*<br />

= g<br />

Nu 0,<br />

019 Re g<br />

0,<br />

83<br />

(287)<br />

<strong>LUCIAN</strong> <strong>GAVRILĂ</strong> <strong>–</strong> <strong>Fenomene</strong> <strong>de</strong> <strong>transfer</strong> <strong>II</strong> 93

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!