The energy transferred from the anterior chamber of the eye through the cornea varies considerably depending on whether a contact lens is worn. Treat the eye as a spherical system and assume the system to be at steady state. The convection coefficient h o is unchanged with and without the contact lens in place. The cornea and the lens cover one-third of the spherical surface area. Values of the parameters representing this situation are as follows: r 1 = 10.2 mm r 2 = 12.7 mm r 3 = 16.5 mm T ∞ , o = 21 ° C T ∞ , i = 37 ° C k 2 = 0.80 W/m ⋅ K k 1 = 0.35 W/m ⋅ K h o = 6 W/m 2 ⋅ K h i = 12 W/m 2 ⋅ K Construct the thermal circuits. labeling all potentials and flows for the systems excluding the contact lens and including the contact lens. Write resistance elements in terms of appropriateparameters. Determine the heat loss from the anterior chamber with and without the contact lens in place. Discuss the implication of your results.
The energy transferred from the anterior chamber of the eye through the cornea varies considerably depending on whether a contact lens is worn. Treat the eye as a spherical system and assume the system to be at steady state. The convection coefficient h o is unchanged with and without the contact lens in place. The cornea and the lens cover one-third of the spherical surface area. Values of the parameters representing this situation are as follows: r 1 = 10.2 mm r 2 = 12.7 mm r 3 = 16.5 mm T ∞ , o = 21 ° C T ∞ , i = 37 ° C k 2 = 0.80 W/m ⋅ K k 1 = 0.35 W/m ⋅ K h o = 6 W/m 2 ⋅ K h i = 12 W/m 2 ⋅ K Construct the thermal circuits. labeling all potentials and flows for the systems excluding the contact lens and including the contact lens. Write resistance elements in terms of appropriateparameters. Determine the heat loss from the anterior chamber with and without the contact lens in place. Discuss the implication of your results.
The energy transferred from the anterior chamber of the eye through the cornea varies considerably depending on whether a contact lens is worn. Treat the eye as a spherical system and assume the system to be at steady state. The convection coefficient
h
o
is unchanged with and without the contact lens in place. The cornea and the lens cover one-third of the spherical surface area.
Values of the parameters representing this situation are as follows:
r
1
=
10.2
mm
r
2
=
12.7
mm
r
3
=
16.5
mm
T
∞
,
o
=
21
°
C
T
∞
,
i
=
37
°
C
k
2
=
0.80
W/m
⋅
K
k
1
=
0.35
W/m
⋅
K
h
o
=
6
W/m
2
⋅
K
h
i
=
12
W/m
2
⋅
K
Construct the thermal circuits. labeling all potentials and flows for the systems excluding the contact lens and including the contact lens. Write resistance elements in terms of appropriateparameters.
Determine the heat loss from the anterior chamber with and without the contact lens in place.
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The system given on the left, consists of three pulleys and
the depicted vertical ropes.
Given:
ri
J₁, m1
R = 2r;
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r2, J2, m₂
m1; m2; M3
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J3, m3
a) Determine the radii 2 and 3.
B: Solid rotating shaft used in the boat with high speed shown in Figure. The amount of power transmitted at the
greatest torque is 224 kW with 130 r.p.m. Used DE-Goodman theory to determine the shaft diameter. Take the
shaft material is annealed AISI 1030, the endurance limit of 18.86 kpsi and a factor of safety 1. Which criterion
is more conservative?
Note: all dimensions in mm.
1
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Motor
300
Thrust
Bearing
Sprocket
100
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Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning