Referring to the semiconductor processing tool of Problem 5.13, it is desired at some point in the manufacturing cycle to cool the chuck, which is made of aluminum alloy 2024. The proposed cooling scheme passes air at 20°C between the air-supply head and the chuck surface. (a) If the chuck is initially at a uniform temperature of l00°C, calculate the time required for its lower surface to reach 25°C, assuming a uniform convection coefficient of 50 W / m 2 ⋅ K at the head—chuck interface. (b) Generate a plot of the time-to-cool as a function of the convection coefficient for the range 10 ≤ h ≤ 2000 W / m 2 ⋅ K . If the lower limit represents a free convection condition without any head present, comment on the effectiveness of the head design as a method for cooling the chuck.
Referring to the semiconductor processing tool of Problem 5.13, it is desired at some point in the manufacturing cycle to cool the chuck, which is made of aluminum alloy 2024. The proposed cooling scheme passes air at 20°C between the air-supply head and the chuck surface. (a) If the chuck is initially at a uniform temperature of l00°C, calculate the time required for its lower surface to reach 25°C, assuming a uniform convection coefficient of 50 W / m 2 ⋅ K at the head—chuck interface. (b) Generate a plot of the time-to-cool as a function of the convection coefficient for the range 10 ≤ h ≤ 2000 W / m 2 ⋅ K . If the lower limit represents a free convection condition without any head present, comment on the effectiveness of the head design as a method for cooling the chuck.
Solution Summary: The author explains how the thermal insulation system can maintain oxygen losses below 1kg/day.
Referring to the semiconductor processing tool of Problem 5.13, it is desired at some point in the manufacturing cycle to cool the chuck, which is made of aluminum alloy 2024. The proposed cooling scheme passes air at 20°C between the air-supply head and the chuck surface.
(a) If the chuck is initially at a uniform temperature of l00°C, calculate the time required for its lower surface to reach 25°C, assuming a uniform convection coefficient of
50
W
/
m
2
⋅
K
at the head—chuck interface.
(b) Generate a plot of the time-to-cool as a function of the convection coefficient for the range
10
≤
h
≤
2000
W
/
m
2
⋅
K
. If the lower limit represents a free convection condition without any head present, comment on the effectiveness of the head design as a method for cooling the chuck.
Can you provide steps and an explaination on how the height value to calculate the Pressure at point B is (-5-3.5) and the solution is 86.4kPa.
PROBLEM 3.46
The solid cylindrical rod BC of length L = 600
mm is attached to the rigid lever AB of length a
= 380 mm and to the support at C. When a 500
N force P is applied at A, design specifications
require that the displacement of A not exceed
25 mm when a 500 N force P is applied at A
For the material indicated determine the
required diameter of the rod.
Aluminium: Tall = 65 MPa, G = 27 GPa.
A
Find the equivalent mass of the rocker arm assembly with respect to the x coordinate.
k₁
mi
m2
k₁
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