Heat Transfer in Vacuum - Owens Design
Heat Transfer in Vacuum - Owens Design
Heat Transfer in Vacuum - Owens Design
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Approximation for eng<strong>in</strong>eer<strong>in</strong>g calculations<br />
• all surfaces are gray: absorptivity = emissivity, does not<br />
depend on wavelength ( rarely exist <strong>in</strong> real life, many<br />
materials are gray over certa<strong>in</strong> wavelength ranges )<br />
• all surfaces are opaque<br />
• all surfaces are diffusive<br />
• all surfaces are at uniform temperature<br />
Q :=<br />
⎛<br />
⎝<br />
1 − e<br />
1<br />
e ⋅A 1 1<br />
⎡<br />
⎣<br />
( ) 4 − ( T 2 ) 4<br />
σ⋅<br />
T 1<br />
⎞<br />
⎠<br />
+<br />
1<br />
A ⋅F 1 12<br />
+<br />
⎤<br />
⎦<br />
⎛<br />
⎝<br />
1 − e<br />
2<br />
e ⋅A 2 2<br />
⎞<br />
⎠
Change language