Air in a 10 ft3 cylinder is initially at a pressure of 10 atm and a temperature of 330 K. The cylinder is to be emptied by openi
ng a valve, and letting the pressure drop to that of the atmosphere. What will be the temperature and mass of the gas in the cylinder if this is done?In a manner which maintains the temperature of the gas at 330 K?
2 answers:
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Answer:
the heat transfer from the pipe will decrease when the insulation is taken off for r₂<
where;
r₂ = outer radius
= critical radius
Explanation:
Note that the critical radius of insulation depends on the thermal conductivity of the insulation k and the external convection heat transfer coefficient h .
The rate of heat transfer from the cylinder increases with the addition of insulation for outer radius less than critical radius (r₂< ) 0, and reaches a maximum when r₂ =
, and starts to decrease for r₂<
. Thus, insulating the pipe may actually increase the rate of heat transfer from the pipe instead of decreasing it when r₂<
.