Air at p = 1 a t m enters a thin-walled ( D = 5-mm diameter) long tube ( L = 2 m ) at an inlet temperature of T m . i = 100 ° C . A constant heat flux is applied to the air from the tube surface. The air mass flow rate is m ˙ = 135 × 10 − 6 k g / s . (a) If the tube surface temperature at the exit is T s , o = 160 ° C , determine the heat rate entering the tube. Evaluate properties at T = 400 K . (b) It the tube length of’ part (a) were reduced to L = 0.2 m , how would flow conditions at the tube exit be affected? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part (a)? (c) If the flow rate of part (a) were increased by a factor of 10, would there be a difference in flow conditions at the lube exit? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part (a)?
Air at p = 1 a t m enters a thin-walled ( D = 5-mm diameter) long tube ( L = 2 m ) at an inlet temperature of T m . i = 100 ° C . A constant heat flux is applied to the air from the tube surface. The air mass flow rate is m ˙ = 135 × 10 − 6 k g / s . (a) If the tube surface temperature at the exit is T s , o = 160 ° C , determine the heat rate entering the tube. Evaluate properties at T = 400 K . (b) It the tube length of’ part (a) were reduced to L = 0.2 m , how would flow conditions at the tube exit be affected? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part (a)? (c) If the flow rate of part (a) were increased by a factor of 10, would there be a difference in flow conditions at the lube exit? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part (a)?
Air at
p
=
1
a
t
m
enters a thin-walled (
D
= 5-mm
diameter) long tube
(
L
=
2
m
)
at an inlet temperature of
T
m
.
i
=
100
°
C
. A constant heat flux is applied to the air from the tube surface. The air mass flow rate is
m
˙
=
135
×
10
−
6
k
g
/
s
. (a) If the tube surface temperature at the exit is
T
s
,
o
=
160
°
C
, determine the heat rate entering the tube. Evaluate properties at
T
=
400
K
. (b) It the tube length of’ part (a) were reduced to
L
=
0.2
m
, how would flow conditions at the tube exit be affected? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part (a)? (c) If the flow rate of part (a) were increased by a factor of 10, would there be a difference in flow conditions at the lube exit? Would the value of the heat transfer coefficient at the tube exit be greater than, equal to, or smaller than the heat transfer coefficient for part (a)?
PROBLEM 3.23
3.23 Under normal operating condi-
tions a motor exerts a torque of
magnitude TF at F. The shafts
are made of a steel for which
the allowable shearing stress is
82 MPa and have diameters of
dCDE=24 mm and dFGH = 20
mm. Knowing that rp = 165
mm and rg114 mm, deter-
mine the largest torque TF
which may be exerted at F.
TF
F
rG-
rp
B
CH
TE
E
1. (16%) (a) If a ductile material fails under pure torsion, please explain the failure
mode and describe the observed plane of failure.
(b) Suppose a prismatic beam is subjected to equal and opposite couples as shown
in Fig. 1. Please sketch the deformation and the stress distribution of the cross
section.
M
M
Fig. 1
(c) Describe the definition of the neutral axis.
(d) Describe the definition of the modular ratio.
using the theorem of three moments, find all the moments, I only need concise calculations with minimal explanations. The correct answers are provided at the bottom
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