TC - Regime Transiente

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    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

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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

    =