1. (. 9.2). t 1 t 2. :
q=-λ∙∂t/∂n=-λ∙∂t/∂x=-λ ∙(tc 2- tc 1)/(xc 2- xc 1)
q = λ ∙Δ t /Δ x. (9.13)
Δ x=δ,
q= (λ/δ)∙Δ t. (9.14)
R=δ/λ - [(2∙)/]. :
q =(t 1 t 2)/ R. (9.15)
, - F τ:
Q=q∙F∙τ =(t 1 t 2)/ RF∙τ. (9.16)
:
tx=t 1(t 1 t 2)∙ x/δ. (9.17)
2. . (. 9.3). t 1 t 2; λ 1, λ 2, λ 3; δ 1, δ 2, δ 3.
:
q=λ 1/ δ 1∙(t 1- t 1), (9.18)
q=λ 2/ δ 2∙(t 1 t 2), (9.19)
q=λ 3/ δ 3∙(t 2 t 2), (9.20)
(9.18)-(9.20) - , :
q = (t 1- t 2)/ R o, (9.21)
R o=(δ 1/ λ 1+ δ 2/ λ 2+ δ 3/ λ 3) - .
:
t 1= t 1- q ∙(δ 1/ λ 1). (9.22)
t 2= t 1 q (δ 2/ λ 2). (9.23)
1. . l, d 1 d 2 (. 9.4). t 1 t 2. :
Q = -λ∙2∙ π∙rl∂t/∂r (9.24)
, ,
Q = 2 πλl Δ t/ln (d 2/ d 1), (9.25)
Δ t = t 1 t 2 - ; λ - κ .
( ):
ql=Q/l =2 πλ Δ t/ln (d 2/ d 1), [/]. (9.26)
d:
tx=t 1(t 1 t 2) ln (d x/ d 1)/ ln (d 2/ d 1). (9.27)
2. . , (. 9.5). t 1, t 2, λ 1, λ 2, λ 3, d 1, d 2, d 3, d 4.
:
1-
Q= 2 πλ 1 l (t 1 t 1)/ln(d 2/ d 1), (9.28)
2-
Q =2 πλ 2 l (t 1 t 2)/ln(d 3/ d 2), (9.29)
3-
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Q =2 πλ 3 l (t 2 t 2)/ln(d 4/ d 3). (9.30)
(9.28)-(9.30), :
Q =2 πl (t 1 t 2)/[ln(d 2/ d 1)/ λ 1+ln(d 3/ d 2)/ λ 2+ln(d 4/ d 3)/ λ 3]. (9.31)
:
ql=Q/l =2 π (t 1 t 2)/[ln(d 2/ d 1)/λ1+ln(d 3/ d 2)/ λ 2+ln(d 4/ d 3)/ λ 3]. (9.32)
:
t 1= t 1 ql ln(d 2/ d 1)/2 πλ 1. (9.33)
t 2= t 1 ql ln(d 3/ d 2)/2 πλ 2 . (9.34)
9.4.
(. 9.6), d 1 d 2. t 1, t 2, λ. :
Q = - λ 4 πr 2 ∂t/∂r (9.35)