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Ecuaciones de Nusselt
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Planteo de Ecuaciones
Laminar
Nu x
=
0.332 Re x1/ 2 Pr 1/3
Tw = const , Re x 0.6
Flujo de calor
Nu x
Laminar
Nu x
1/ 2
Tw = const , Re x
1/4
Re x Pr
0.453 Re x1/ 2 Pr 1/3
qw
=
0.6 Laminar
Nu x
=
0.4637 Re x1/ 2 Pr 1/ 3
qw
1/3
0.332 Re x
Fricción
1/ 2
Pr
St x Pr 2/ 3
Fricción laminar
St x Pr 2 /3 St x Pr 2/3
Turbulento
Pr
<
St x Pr 2/3
3/4 � � x0 � � 1-� � � � � � x � �
1/ 3
St Pr 2/ 3 Nu L
Turbulento laminar
=
=
=
x
=
0.6
x0 , Re x <
Pr
<
50
2 1/ 2 = 0.332 Re x
=
0.0296 Re x
Tw = con const ,
0.2
-
0.185(log Re x )
=
-
(Re
<
Re x
Recrit . 5 x
�m � 9200) � � � �m w �
0.8 L -
Re x
107
<
<
109
Tw = cons const t , Re x
-
Pr1/ 3 (0.037 Re0L.8 - 871) 0.43
<
Tw = con const ,
2.584
-
0.037 Re L0.2 - 871 Re L1
0.036Pr
=
5 x 105,
<
C fx
1/4
Nu L
5 x 105
Tw = cons constt , come comenz nzan ando do en
107 Turbulento laminar
<
50
const , Re x
5 x 10 105 Turbulento
5 x 105
1/4
-
=
<
100
const , Re x
<
=
>
2/3 � �0.0207 � � 1 + � � �� � � Pr � �
Laminar
Nu x
5 x 105
Pr
2/3 � �0.0468 � � 1 + � � �� � � Pr � � =
<
50
<
1/ 3
0.6795Re x
0.3387 Re x1/ 2 Pr 1/3
=
Pr
5 x 105
qw L / k
Tw - T � =
Laminar
<
<
<
Tw = const , Re x
<
107
105 7
10 liquidos
<
m a T � m w a T w
Laminar
d x
Turbulento
d x
Turbulento
d x
=
=
C fx
Turbulento
C fx
5.0 Re x
0.381 Re x
0.381 Re x
Laminar
Turbulento
=
C fx
=
1/5
-
-
Re x
<
5 x 10 1 05
Re x
<
105
d = 0 a x = 0
1/5
-
5 x 10 105 1
-
10256Rex
Re crit d
=
< =
Re x
<
0.0592 Rex 1/5
5 x 10 105
<
-
-
0.37(log 0.37(log Re Re x )
2.584
-
107
Re x
107
<
5 x 105
d lam a Recrit
0.664 Re x 1/2
= =
1/2
-
<
5 x 10 1 05 Re x
Re x
<
<
107
109
Turbulento
C fx
=
Turbulento
0.455 (log Re x ) C fx
Turbulento
0.074
=
Re L1/5
St x Pr 2/3
Turbulento
St x Pr 2/3
Laminar a turbulen
St x Pr 2/3 Nu L Nu L
=
=
A
-
0.0296 Re1/5 x
k
Re x
<
109
Recrit .
<
Re x
<
10 7
5 x 105 2.584
107
-
2 x 105 0.26 <
Turbulento en tube
Nud
Flujo Turbulento
h d 0
=
k
Nud
=
Re x
< <
<
107
109 Re L
<
10 7
0.7 < Pr < 380
1/4
�m � 0.43 0.8 (Re L - 9200) � � � = 0.036Pr k �m w �
Nud =
<
Re x
Pr1/3 (0.037Re0.8 L - 871)
hL
Laminar en tuber!a
<
Recrit 5 x 105 y
-
=
<
Re L
0.037 Re L1/5 - 871Re L1
=
Re crit .
Re L
A
0.185 (logRe x )
hL
=
=
-
2.584
-
h d 0 k
=
=
Re L
<
m � m w
<
5.5 x106
3.5
<
4.364
4 0.0395Re3/ Pr 1/3 d
n = 0.4 para calentamiento
0.023Red 0.8 Pr n
n = 0.3 para enfriamiento 0.6 < Pr < 100 2500 < Re d < 1.25 x 105 Flujo Turbulento
Nud
0.5 < Pr < 1.5
0.0214(Red 0.8 - 100) Pr 0.4
=
104 Nud Flujo Turbulento
Flujo Turbulento
Flujo Turbulento
=
<
5 x 106
3000 < Red < 106
0.14
1/3 �m � Nud = 0.027 Re0.8 � d Pr � �m w �
0.14
�d � Nud = 0.036 Re Pr � � L � � 0.8 d
10 <
1/3
�m b Nud = � 1.07 + 12.7( f / 8)1/2 (Pr 2/3 - 1) �m w ( f / 8) Red Pr
Nud
=
n
10% de precision
104
n = 0.25 para Tw
<
Tb
0.8 <
3.66 +
400
0.5 < Pr < 2000
Tb
1.64)
<
d
6% de precision
>
-
L
0.5 < Pr < 200
n = 0.11 para Tw
f = (1.82 log10 Re d Flujo Laminar
Red
1.5 < Pr < 500
0.4 0.012(Re0.87 d - 280) Pr
<
<
Re d < 5 x 106
m b m w
<
40
2
-
0.0668(d/ L)Red Pr 1 + 0.04[(d/ L)Re d Pr]
2/ 3
Tw
=
cons tan te
Flujo Laminar
0.14
1/3
Tw
�d � �m � Nud = 1.86(Re d Pr ) � � � � L � �m w � � 1/3
Flujo Turbulento
2/3
St b Pr f
Placa% &erticale%
Gr x
=
=
Re d Pr
h=
4 3
1/4
-
Nu = 0.68 + Nu
Flujo de calor con%tante
=
h Relación em'!rica
Flujo de calor con%tante Flujo de calor con%tante
0.387 a1/6
Nu xf
=
Cilindro% (ori)ontale% en metale% l!*uido% Placa% (ori)ontale% +,lujo con%tante Placa% (ori)ontale% +,lujo con%tante
1
-
<
a L
<
Gr x*
<
1012
=
g b qw x 4 k n 2 105
0.17 (Gr x* Pr f )1/4
5 4
2 x 1013
<
<
1011
Gr x* Pr < 1016
h
10
5
-
<
Gr Pr < 1012
<
Gr Pr < 109
1/6
1/2
Nu Cilindro% (ori)ontale%
10
0.60 (Gr x* Prf )1/5
h= Cilindro% (ori)ontale%
109
[1 + (0.492 / Pr) 9/16 ]8/27
Grx Nux
=
<
[1 + (0.492 / Pr) 9/16 ]4/9
Gr
Nu xf
a L
0.670 a
0.825 + * x =
10
Gr x1/4
1/4
1/2
>
8
Nu f = C (Gr f Pr f ) m
Placa%
L
g b ( Tw - T�) x 3
Placa% &erticale%
Placa%
d
f
n 2 Nu x = 0.508Pr 1/2 (0.952 + Pr)
Placa% &erticale%
cons tan te
=
� � Gr Pr = 0.60 + 0.387 � � 9/16 16/9 �[1 + (0.559 / Pr) ] Nud = 0.36 + Nud
=
0.518 (Gr d Pr)1/4
10
6
-
[1 + (0.559 / Pr) 9/16 ]4/9
0.53 (rd Pr2 )1/ 4
Nu L
=
0.13 (r L Pr)1/3
Nu L
=
0.16 (r L Pr)1/3
Te
=
Tw
-
0.25(Tw
Gr L Pr < 2 x 108
2 x 108 -
T�)
<
Gr L Pr < 108
La% do% ecuacione% anteriore% %on e&aluada% a la tem'eratura T e
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