It is known that there are some disadvantages in the casting of metal materials if the casting rate is high. Contrary to this si
tuation, are there any disadvantages to using very slow casting rates in the production of metals by casting method? If so, explain what these are?
1 answer:
Answer:
The disadvantages of slow casting rate in the production of metal by casting are:
1. Solidification of metal may start even before the mould is completely filled which may produce defects like misruns and shrinkage capacity as shown in the attachment.
So slow casting rate will produce incomplete and partial casting
2. Slow casting rate will produce casting which have a coarse grain structure which in turn affects the strength of the casting adversely.
3.It causes higher production time for production of casting which in turn increase high labour cost per casting.
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Answer:
A) EXIT TEMPERATURE = 14⁰C
b) rate of heat transfer of air = - 13475.78 = - 13.5 kw
Explanation:
Given data :
diameter of duct = 20-cm = 0.2 m
length of duct = 12-m
temperature of air at inlet= 50⁰c
pressure = 1 atm
mean velocity = 7 m/s
average heat transfer coefficient = 85 w/m^2⁰c
water temperature = 5⁰c
surface temperature ( Ts) = 5⁰c
properties of air at 50⁰c and at 1 atm
= 1.092 kg/m^3
Cp = 1007 j/kg⁰c
k = 0.02735 W/m⁰c
Pr = 0.7228
v = 1.798 * 10^-5 m^2/s
determine the exit temperature of air and the rate of heat transfer
attached below is the detailed solution
Calculate the mass flow rate
= p*Ac*Vmean
= 1.092 * 0.0314 * 7 = 0.24 kg/s
