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• • Calculation No. 145579-D-056, Rev. 1
Attachment 3
Page 19 of 22
OGTS Bypass External Convection and Thermal Radiation Coefficients
's i
Y4 ar
>a r m^
^VIe^dag=FreeConvecpontC4
o^,^ ^^ ^. ,^a ^ 4
el op& a aatkL
Twl = 875 OF
Temperature End I
Tw2 = 250 OF Temperature End 2
Ts = 562.5 OF Average Wall Temperature
To = 115 OF Ambient Temperature
dT = 447,5 OF Temperature difference
h = 1.45 13tu/hr-ft^2-°F Vertical Plane or Cylinder h = 0.19 * dT^1/3
h = 1.38 Btu/hr-ft^2 °F Horizontal C tinder h = 0.18 * dT^1/3
h = 1.68 Btu/hr-ft-2--F Horizontal Plate - heated face u h = 0.22 * dT^1/3
Forced convection, flow across a cylinder (Holman 1990, e n. 6-21):
0.32Rt
x;2 Pr.ra
N'ur.D =0.3+ °
[1 + (0.4 / PT}us ]"' L
sre1.rs
r Re
(1+f ° ^ I ReQ- Pr > 1}.2
+ 282,000 ! )
Nufd = 0.3+A*B/C Forced Convection, Nusselt No.
A'= 0.62Rea !nPr' r' $ _ 1t Red/282,000 S18 ^43,' O., 1r't, 0`4L1xx T13 ^
D = 8.6 Inch Dia of Pie 0.21844 meters
U = 0.1 Mph Free Stream Air Vel. 0.0447 m/s
Ts = 562.5 OF Pipe Wall Temperature 294.72 °C
To = 115 OF Ambient Temperature 46.11 °C
Tf = 338.75 OF Air Film Temperature 170.42 °C
vf = 0.00019 sq ft/sec Viscosity of Air 1.8E-05 sq. m/s
Red = 5.45844E+02 Dimensionless Reynolds No.
Pr = 0.7778 Dimensionless Prandtl No.
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