Consider steady heat transfer between two large parallel plates at constant temperatures of T 1 = 290 K and T 2 = 150 K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity ε = 1 ) , determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (b) filled with super insulation having an apparent thermal conductivity of 0.00015 W/m⋅K.
Consider steady heat transfer between two large parallel plates at constant temperatures of T 1 = 290 K and T 2 = 150 K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity ε = 1 ) , determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (b) filled with super insulation having an apparent thermal conductivity of 0.00015 W/m⋅K.
Consider steady heat transfer between two large parallel plates at constant temperatures of
T
1
=
290
K
and
T
2
=
150
K
that are
L
=
2
cm
apart. Assuming the surfaces to be black (emissivity
ε
=
1
)
,
determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (b) filled with super insulation having an apparent thermal conductivity of 0.00015 W/m⋅K.
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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