er eq =3 m2 M P o Q2\ A long 8-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 7°C and the wind is blowing across the pipe at a velocity of 50 km/h. emp. C Properties of air of 1 atm pressure 252524882 20 30 35 40 50 60 Cross-section of the cylinder Circle 70 Density P. kg/m³ 1.204 1.184 1.164 1.145 1.127 1.109 1.092 D 1.059 1.028 1007 1007 1007 1007 1007 Fluid Specific Tival G J/kg K 1007 1007 1007 1007 Gas or liquid Air V.-50 km/h T₂-PC Thermal Conductivity k, W/m K 0.02514 0.02551 0.02588 0.4-4 4-40 40-4000 4000-40,000 40,000 400,000 0.02625 0.02662 0.02699 0.02735 Range of Re 0.02808 0.02881 Thermal Diflusivity 2.074 x 10-5 2.141 x 10-5 2.208 x 10-5 2.277 x 10-5 2.346 x 10-5 2.416 x 10- 2.487 x 10-5 2.632 x 10-5 2.780 x 10-5 Pipe D-8cm T₁-90°C Nusselt number Nu= 0.989 Re0.330 Pr1/3 Nu = 0.911Re0.385 Pr1/3 Nu = 0.683Re0.466 Pr1/3 Nu = 0.193 Re0.618 Pri/3 Nu = 0.027 Re0.805 Pr1/3 Dynamic Viscosity H, kom-s 1.825 x 10-5 1.849 x 10-5 1.872 x 10-5 1.895 x 10-5 1.918 x 10-5 1.941 x 10-5 1.963 x 10-5 2.008 x 10-5 2.052 x 10-5 Kineralic Viscosity mm²/s 1.516 x 10-5 1.562 x 10-5 1.608 x 10-5 1.655 x 10-5 1.702 x 10-5 1.750 x 10-5 1.798 x 10-5 1.896 x 10-5 1.995 x 10-5 Prandill Number Pr 0.730 0.729 0.728 0.726 0.72 0.72 0.72 0.72 0.71
er eq =3 m2 M P o Q2\ A long 8-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 7°C and the wind is blowing across the pipe at a velocity of 50 km/h. emp. C Properties of air of 1 atm pressure 252524882 20 30 35 40 50 60 Cross-section of the cylinder Circle 70 Density P. kg/m³ 1.204 1.184 1.164 1.145 1.127 1.109 1.092 D 1.059 1.028 1007 1007 1007 1007 1007 Fluid Specific Tival G J/kg K 1007 1007 1007 1007 Gas or liquid Air V.-50 km/h T₂-PC Thermal Conductivity k, W/m K 0.02514 0.02551 0.02588 0.4-4 4-40 40-4000 4000-40,000 40,000 400,000 0.02625 0.02662 0.02699 0.02735 Range of Re 0.02808 0.02881 Thermal Diflusivity 2.074 x 10-5 2.141 x 10-5 2.208 x 10-5 2.277 x 10-5 2.346 x 10-5 2.416 x 10- 2.487 x 10-5 2.632 x 10-5 2.780 x 10-5 Pipe D-8cm T₁-90°C Nusselt number Nu= 0.989 Re0.330 Pr1/3 Nu = 0.911Re0.385 Pr1/3 Nu = 0.683Re0.466 Pr1/3 Nu = 0.193 Re0.618 Pri/3 Nu = 0.027 Re0.805 Pr1/3 Dynamic Viscosity H, kom-s 1.825 x 10-5 1.849 x 10-5 1.872 x 10-5 1.895 x 10-5 1.918 x 10-5 1.941 x 10-5 1.963 x 10-5 2.008 x 10-5 2.052 x 10-5 Kineralic Viscosity mm²/s 1.516 x 10-5 1.562 x 10-5 1.608 x 10-5 1.655 x 10-5 1.702 x 10-5 1.750 x 10-5 1.798 x 10-5 1.896 x 10-5 1.995 x 10-5 Prandill Number Pr 0.730 0.729 0.728 0.726 0.72 0.72 0.72 0.72 0.71
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
Transcribed Image Text:er
its
eq
=3
m2
Of
nic
Q2\ A long 8-cm-diameter steam pipe whose external surface temperature is 90°C passes through some
open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit
of its length when the air is at 1 atm pressure and 7°C and the wind is blowing across the pipe at a
velocity of 50 km/h.
emp.
C
Properties of air at 1 atm pressure
20
25
30
35
40
Cross-section
of the cylinder
Circle
45
50
60
70
Density
p. kg/m³
1.204
1.184
1.164
1.145
1.127
1.109
1.092
D
1.059
1.028
Fluid
1007
1007
1007
1007
1007
1007
1007
1007
1007
Gas or
liquid
Specific
Ival
GJ/kg K
Air
V_-50 km/h
7₂-PC
Thermal
Conductivity
k, W/m K
0.02514
0.02551
0.02588
0.02625
0.02662
0.4-4
4-40
40-4000
4000-40,000
40,000 400,000
Range of Re
0.02699
0.02735
0.02808
0.02881
Thermal
Diflusivity
a, mis
2.074 x 10-5
2.141 x 10-
2.208 x 10-5
2.277 x 10-5
2.346 x 10-5
2.416 x 10-
2.487 x 10-5
10-5
2.780 x 10-5
2.632 x
Pipe
D-8cm
T₁-90°C
Nusselt number
Nu== 0.989Re0.330 Pr1/3
Nu = 0.911Re0.385 Pr1/3
Nu = 0.683Re0.466 Pr1/3
Nu = 0.193 Re0.618 Pr1/3
Nu = 0.027 Re0.805 Pr¹/3
Dynamic
Viscosity
H. ko'm-s
1.825 x 10-5
1.849 x 10-5
1.872 x 10-5
1.895 x 10-5
1.918 x 10-5
1.941 x 10-5
1.963 x 10-5
2.008 x 10-5
2.052 x 10-5
Kinematic
Viscosity
mm²/s
1.516 x 10-5
1.562 x 10-5
1.608 x 10-5
1.655 x 10-5
1.702 x 10-5
1.750 x 10-5
1.798 x 10-5
1.896 x 10-5
1.995 x 10-5
Prandill
Number
Pr
0.7309
0.7296
0.7283
0.726
0.725
0.724
0.722
0.720
0.71
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