After heat treatment, the 2-cm-thick metal plates (k = 180 W/m .K, p = 2800 kg/m 3 , a n d c p = 880 J/kg .K) and are conveyed through a cooling chamber with a length of 10 m. The plates enter the cooling chamber at an initial temperature of 500°C. The cooling chamber maintains a temperature of 10°C, and the convection heat transfer coefficient is given as a function of the air velocity blowing over the plates h = 33 V 0.8 , where Ii is in W/m 2 K and V is in m/s. To prevent any incident of thermal burn, it is necessary for the plates to exit the cooling chamber at a temperature below 50°C. In designing the cooling process to meet this safety criterion, use appropriate software to investigate the effect of the air velocity on the temperature of the plates at the exit of the cooling chamber. Let the air velocity vary from 0 to 40 m/s, and plot the temperatures of the plates exiting the cooling chamber as a function of air velocity at the moving plate speed of 2, 5, and 8 cm/s.
After heat treatment, the 2-cm-thick metal plates (k = 180 W/m .K, p = 2800 kg/m 3 , a n d c p = 880 J/kg .K) and are conveyed through a cooling chamber with a length of 10 m. The plates enter the cooling chamber at an initial temperature of 500°C. The cooling chamber maintains a temperature of 10°C, and the convection heat transfer coefficient is given as a function of the air velocity blowing over the plates h = 33 V 0.8 , where Ii is in W/m 2 K and V is in m/s. To prevent any incident of thermal burn, it is necessary for the plates to exit the cooling chamber at a temperature below 50°C. In designing the cooling process to meet this safety criterion, use appropriate software to investigate the effect of the air velocity on the temperature of the plates at the exit of the cooling chamber. Let the air velocity vary from 0 to 40 m/s, and plot the temperatures of the plates exiting the cooling chamber as a function of air velocity at the moving plate speed of 2, 5, and 8 cm/s.
Solution Summary: The author analyzes the effect of air velocity on the temperature of stainless steel plates at the exit of the cooling chamber.
After heat treatment, the 2-cm-thick metal plates
(k = 180 W/m
.K,
p
=
2800
kg/m
3
,
a
n
d
c
p
=
880
J/kg
.K)
and are conveyed through a cooling chamber with a length of 10 m. The plates enter the cooling chamber at an initial temperature of 500°C. The cooling chamber maintains a temperature of 10°C, and the convection heat transfer coefficient is given as a function of the air velocity blowing over the plates
h
=
33
V
0.8
, where Ii is in W/m2 K and V is in m/s. To prevent any incident of thermal burn, it is necessary for the plates to exit the cooling chamber at a temperature below 50°C. In designing the cooling process to meet this safety criterion, use appropriate software to investigate the effect of the air velocity on the temperature of the plates at the exit of the cooling chamber. Let the air velocity vary from 0 to 40 m/s, and plot the temperatures of the plates exiting the cooling chamber as a function of air velocity at the moving plate speed of 2, 5, and 8 cm/s.
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Using MATLAB , find the magnitude and phase plot of the compensators
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4-81 The corner shown in Figure P4-81 is initially uniform at 300°C and then suddenly
exposed to a convection environment at 50°C with h 60 W/m². °C. Assume the
=
2
solid has the properties of fireclay brick. Examine nodes 1, 2, 3, 4, and 5 and deter-
mine the maximum time increment which may be used for a transient numerical
calculation.
Figure P4-81
1
2
3
4
1 cm
5
6
1 cm
2 cm
h, T
+
2 cm
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A union feedback control system has the following open loop transfer function
where k>0 is a variable proportional gain
i. for K = 1 , derive the exact magnitude and phase expressions of G(jw).
ii) for K = 1 , identify the gaincross-over frequency (Wgc) [where IG(jo))| 1] and phase cross-overfrequency [where <G(jw) = - 180]. You can use MATLAB command "margin" to obtain there quantities.
iii) Calculate gain margin (in dB) and phase margin (in degrees) ·State whether the closed-loop is stable for K = 1 and briefly justify your answer based on the margin . (Gain marginPhase margin)
iv. what happens to the gain margin and Phase margin when you increase the value of K?you
You can use for loop in MATLAB to check that.Helpful matlab commands : if, bode, margin, rlocus
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