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7/26/2019 TC - Regime Transiente
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1
TRANSFERNCIA DE CALOR EMREGIME TRANSIENTE
. D J M G C
E
,
, TC REGIME TRANSIENTE.
TC/ Regime Transiente
N TC R T,
,
; TC ,
. O .
TC/ Regime Transiente
E:
,
.
TC/ Regime Transiente
O :
. S
,
. S
.
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TC/ Regime Transiente
D: Q
,
. C
,
.
EGIME ANIENE
P, .
TC/ Regime Transiente
M CG C
G
M
G
MTODOS
TC/ Regime Transiente
Mtodo da Capacitncia Concentrada
U :
U .
C
T T < T.
R
TC/ Regime Transiente
Mtodo da Capacitncia Concentrada
S = 0,
> 0,
.
E TC
.
A
TC.
E
.
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TC/ Regime Transiente TC/ Regime Transiente
TC/ Regime Transiente TC/ Regime Transiente
7/26/2019 TC - Regime Transiente
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TC/ Regime Transiente TC/ Regime Transiente
TC/ Regime Transiente
A , ,
(
) (
).
T NUNCA OCORRE
NUNCA
DESPREZVEL.
TC/ Regime Transiente
M SITUAO SIMILAR
. E
;
PERFEITAMENTE MISTURADO.
IMPORTANTE:
CONVECO.
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TC/ Regime Transiente TC/ Regime Transiente
BEAE:
O U TC
( ),
,
.
O
( ),
.
TC/ Regime Transiente
P
:
Q ?
O ? P ?
TC/ Regime Transiente
V
.
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D ,
(
(A)
()), :
A,
.
TC/ Regime Transiente TC/ Regime Transiente
O:
Rt a resistncia TC por conveco
Ct a capacidade trmica concentrada do slido
P, R C
( = 0).
C :
TC/ Regime Transiente
U , ,
. O
= 400 W/2.K, = 20
W/.K, = 400 J/.K = 8500 /3
.
D
1 .
S 25C
200C, 199C?
TC/ Regime Transiente
SOLUO
V
D = ???
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TC/ Regime Transiente
Anlise Geral da Capacidade Concentrada
E
C ,
.
E: ,
, ,
.
:
TC/ Regime Transiente
2) RESISTNCIA INTERNA NO DESPREZVEL
TC/ Regime Transiente
C 2L
T0= , ;
T = , .
TC/ Regime Transiente
C 2L
T0= , ;
T = , .
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TC/ Regime Transiente
(,)= ,
;
(L,)= ( +L L),
;
()= , ;
= TC,
;
A= TC,
;
( NO ).
C 2L
TC/ Regime Transiente
TC/ Regime Transiente TC/ Regime Transiente
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TC/ Regime Transiente TC/ Regime Transiente
C H
C ()
2L,
0, 0.
O ;
A TC () ;
N .
TC/ Regime Transiente
C H
P TC
,
.
TC/ Regime TransienteC H
1. T A:
2. N F:
3. P R:
4. R R:
O :
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TC/ Regime Transiente
CNIDEAE IMANE
MD DA CAACINCIA
( < 0,1)
MD DA CAA( > 0,1)
F
TC/ Regime Transiente
CNIDEAE IMANE
L
= 0
=
1= L/2
L
= ?
1. 2.
= 1
= ?
1= L/2
TC/ Regime Transiente
CNIDEAE IMANE
L
= 0,5
=
1= L/2
L
= ?
3. 4.
= 01= L
= 1/2
= ?
TC/ Regime Transiente
CNIDEAE IMANE
=
1=
D
1.
1=
D
2.
= 0
= ?
= 1
= ?
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TC/ Regime Transiente
CNIDEAE IMANE
=
1=
D
1. 2.
1=
D
= 0
= ? = 1
= ?
TC/ Regime Transiente
I
TC/ Regime Transiente
C
TC/ Regime Transiente
E
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TC/ Regime Transiente
TC/ Regime TransienteC
TC/ Regime TransienteE
TC/ Regime Transiente
EXERCCIO 1
U 15 C
.
I, 20 C, ,
8 W/2.K.
M 9
= 840 /3,
= 3,81 J/.K = 0,418 W/.C,
) .
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TC/ Regime Transiente
SOLUO
A
. I B
:
B = 0,2871 > 0,1
TC/ Regime Transiente
F (0,23); (0); (1,16)
TC/ Regime TransienteE
TC/ Regime Transiente
2.E ( = 0,566 W/.C; = 3,605
J/.K; = 1,07 /3
), 90 C. O 4,8 . O
600 W/2.K. 25 C .
E:
) O 70 C.
) S 6,3 ,
.
EXERCCIO 2
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TC/ Regime TransienteE
F = 0,26
C
TC/ Regime Transiente
EXERCCIO 3
3.U ( = 1,125 W/.K; = 919 J/.K; = 2310 /3),
50 200 K,
1200 K. S
7,38 W/2.K
, :
) O 600 K.
) A .
Livro: Fundamentals of Momentum, Heat, and Mass Transfer [Welty (pg. 273)]
TC/ Regime Transiente
q
0,5 m
T0= 200 K
T= 1200 K
T = 600 K ( )
= 7,38 W/2
.K = 1,125 W/.K;
= 919 J/.K;
= 2310 /3
1= L
= ? = 600 K
) N : =
) N : = 0
=