0 - Hanford Site

i
Y"
c^ N
j of
OGTS Bypass External Convection and Thermal Radiation Coefficients
Free Convection Correlations for air at 1 atm. (Holman 1990, Table 7-2)
Twl = 875 OF Temperature End 1
Tw2 = 250 °F Tem erature End 2
Ts - 562.5
OF
Average Wall Temperature
To = 115
OF
Ambient Temperature
dT = 447.5 °F i Temperature difference
h = 1.45 Btwhr-ft, ,2-°F Vertical Plane or Cylinder h = 0.19 * dT^l i3
h = 1.38 Btu/hr-ft^2-°F Horizontal Cylinder h = 0.18 * dT^1/3
h = 1.68 ! Btu-'hr-ft^2-°F Horizontal Plate - heated face up h = 0.22 * dT^ 1 /3
Forced convection, flow across a cylinder (Holman 1990, e n. 6-21):
0.61Re^,`Rr"3; Rey,
Nufd = 0.3+A*B/C Forced Convection, Nusselt No.
A = 0:62Red"2Pr"3 B = 1+(Red/282,000)^5/8]^4/5 1 to .4'
D = 8.6 Inch Dia of Pie 1844 meters
U = 0.1 Mph Free Stream Air Vel. -~-0.0447 m/s
Ts = 5625 OF I Pi e Wall Temperature 294.72 °C
To — 115 OF Ambient Temperature 46.11 °C
Tf = 338.75 OF Air Film Temperature 170.42 °C
= 0.00019 1 sq ft sec Viscosity of Air 1.8E-45 s . m/s
Red = 5.45844E+02 Dimensionless Reynolds No
Pr = 0.7778 Dimensionless Prandtl No.
kf = 0.0146 Btu/hr- ft-°F Thermal Conductive 1) 253 W/m-°C
1v N.p
si