PRENOS TOPLOTE
PRENOS TOPLOTE
PRENOS TOPLOTE
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<strong>PRENOS</strong> <strong>TOPLOTE</strong> – NESTACIONARNI <strong>PRENOS</strong> <strong>TOPLOTE</strong><br />
TELO KONČNIH DIMENZIJ<br />
‣ spremembo temperature zaznamo po celotnem prerezu<br />
‣ temperaturno polje je odvisno od časa in kraja T = f(x,t)<br />
∂T<br />
∂t<br />
T 1<br />
=<br />
2<br />
∂ T<br />
a ⋅<br />
2<br />
∂x<br />
T<br />
t→ ∞<br />
Robni pogoji:<br />
t = 0 T = T 0<br />
x ≥ 0<br />
t > 0 T = T 1<br />
x = ±L<br />
t ≥ 0 dT/dx = 0 x = 0<br />
t 4<br />
t 3<br />
t 2<br />
t 1<br />
T 0 t=0<br />
-x -L<br />
0<br />
L x<br />
Brezdimenzijske spremenljivke:<br />
T1<br />
−T<br />
Temperatura: Θ =<br />
T −T<br />
Razdalja<br />
Čas<br />
n =<br />
τ<br />
1<br />
x<br />
L<br />
a ⋅t<br />
L<br />
= 2<br />
0<br />
=<br />
Fo