PRENOS TOPLOTE
PRENOS TOPLOTE
PRENOS TOPLOTE
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<strong>PRENOS</strong> <strong>TOPLOTE</strong> – NESTACIONARNI <strong>PRENOS</strong> <strong>TOPLOTE</strong><br />
POLNESKONČNO TELO<br />
T 1<br />
T 0<br />
t 1<br />
t 2<br />
t 3<br />
Termični mejni sloj<br />
T<br />
Θ =<br />
T<br />
1<br />
− T<br />
− T<br />
0<br />
=<br />
erf<br />
x<br />
4 ⋅ a ⋅t<br />
=<br />
1<br />
2<br />
x<br />
ξ =<br />
4 ⋅ a ⋅t<br />
π<br />
∫ e<br />
−ξ<br />
2<br />
dξ<br />
Toplotni tok na površino je časovno odvisen<br />
0<br />
L<br />
q<br />
q<br />
=<br />
=<br />
λ<br />
4 ⋅ a ⋅t<br />
h( T ) 1<br />
− T0 ( T 1<br />
− T 0<br />
)<br />
h<br />
λ<br />
=<br />
π ⋅ a ⋅t<br />
h<br />
m<br />
t<br />
m<br />
1 λ λ<br />
=<br />
t<br />
∫ = 2<br />
π ⋅ a ⋅t<br />
π ⋅ a ⋅t<br />
0<br />
m
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