9
.
.
: , , ().
. . . , .
, . , . , dQx, dt
. 2.2
F, , dt.
(2.6)
() (2.6) , , . λ .
, .
, . . .
. (2.6) Fdt
q. , .
(2.7)
, .
: .
.
0 1, , , , . () .
(, , , .).
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, .
.
q k = α k(T1 T0) (2.8)
α k , , , , .
, . , , . . -
(2.9)
0 .
, . 0 = 1,378.10 4 /2... = e0, e . e = 0,2÷0,4, e = 0,6÷0,95, e = 0,9÷0,95.
q r c 0
q r = a r( 0), (2.10)
a r [/2..]. a r .
, , . .
q = q r + q k = (a r + a k)(T T0)
q = a ( ), (2.11)
a .
. 3004400 8 . 800 8 80%.
. .
1. t = 0.
2. .
, , t = 0, :
T (x, y, z, 0) = T0 (x, y, z). (2.12)
:
T (x, y, z, 0) = T0 = const. (2.13)
, .
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. 2.3
. . , , .
, (. 2.3), , , ℓ . , , , , .
(2.14)
. , , .
. .