Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state page 232 through a pipe ( k = 25 W/m .K, D i =25 cm, D o =4 cm and L= 10 m) . and Since liquid ammonia has a normal boiling point of -33.3°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid anunonia and the ambient air are 100 Wm2K and 20 Vin2K. respectively. Determine the insulation thickness for the pipe using a material with k = 0 .75W/m 2 .K, to keep the liquid ammonia flowing at an average temperature of -35°C, while maintaining the insulated pipe outer surface temperature at 10°C.
Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state page 232 through a pipe ( k = 25 W/m .K, D i =25 cm, D o =4 cm and L= 10 m) . and Since liquid ammonia has a normal boiling point of -33.3°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid anunonia and the ambient air are 100 Wm2K and 20 Vin2K. respectively. Determine the insulation thickness for the pipe using a material with k = 0 .75W/m 2 .K, to keep the liquid ammonia flowing at an average temperature of -35°C, while maintaining the insulated pipe outer surface temperature at 10°C.
Solution Summary: The author analyzes the thermal resistances of different layers by solving for the insulation thermal conductivity yields kins = 0.75 W/m-K.
Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state page 232 through a pipe
(
k
=
25
W/m
.K,
D
i
=25 cm, D
o
=4 cm and L= 10 m)
.
and Since liquid ammonia has a normal boiling point of -33.3°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid anunonia and the ambient air are 100 Wm2K and 20 Vin2K. respectively. Determine the insulation thickness for the pipe using a material with
k = 0
.75W/m
2
.K,
to keep the liquid ammonia flowing at an average temperature of -35°C, while maintaining the insulated pipe outer surface temperature at 10°C.
The state of stress at a point is σ = -4.00 kpsi, σy = 16.00 kpsi, σ = -14.00 kpsi, Try = 11.00 kpsi,
Tyz = 8.000 kpsi, and T = -14.00 kpsi.
Determine the principal stresses.
The principal normal stress σ₁ is determined to be [
The principal normal stress σ2 is determined to be [
The principal normal stress σ3 is determined to be
kpsi.
kpsi.
The principal shear stress 71/2 is determined to be [
The principal shear stress 7½ is determined to be [
The principal shear stress T₁/, is determined to be [
kpsi.
kpsi.
kpsi.
kpsi.
Repeat Problem 28, except using a shaft that is rotatingand transmitting a torque of 150 N * m from the left bearing to the middle of the shaft. Also, there is a profile keyseat at the middle under the load.
(I want to understand this problem)
Prob 2.
The material distorts into the dashed position
shown. Determine the average normal strains &x, Ey
and the shear strain Yxy at A, and the average
normal strain along line BE.
50 mm
B
200 mm
15 mm
30 mm
D
ΕΙ
50 mm
x
A
150 mm
F
Chapter 3 Solutions
Heat and Mass Transfer: Fundamentals and Applications
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