Example 3.8.In Example 3.7 we considered a vacuum system with zero leaks. No real vacuum systems aretotally leak-free; engineers work very hard to keep the leakage rate as low as possible. If thetank in Example 3.7 has a leak of 0.0001 lbm/min of air, what will the pressure-time plot looklike, and what will be the final pressure? ex: 3.7 is posted Example 3.7.The microchip diffusion furnace in Fig. 3.4 contains air,which may be considered an ideal gas. The vacuumpump is pumping air out prior to beginning the thermaldiffusion step. During the pumpout process the heatingcoils in the tank hold the temperature in the tankconstant at 68 °F. The volumetric flow rate at the inlet ofthe pump, independent of pressure, is 1.0 ft³/min. Howlong does it take the pressure to fall from 1 atm to0.0001 atm?Volume 10 ft³68°FHeaterX TenorVacuumpumpTemperaturecontrollerFigure 3.4 Evacuation of a microchipdiffusion furnace.

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Answered: Example 3.8. In Example 3.7 we…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Example 3.8.
In Example 3.7 we considered a vacuum system with zero leaks. No real vacuum systems are
totally leak-free; engineers work very hard to keep the leakage rate as low as possible. If the
tank in Example 3.7 has a leak of 0.0001 lbm/min of air, what will the pressure-time plot look
like, and what will be the final pressure?

ex: 3.7 is posted

Example 3.7.
The microchip diffusion furnace in Fig. 3.4 contains air,
which may be considered an ideal gas. The vacuum
pump is pumping air out prior to beginning the thermal
diffusion step. During the pumpout process the heating
coils in the tank hold the temperature in the tank
constant at 68 °F. The volumetric flow rate at the inlet of
the pump, independent of pressure, is 1.0 ft³/min. How
long does it take the pressure to fall from 1 atm to
0.0001 atm?
Volume 10 ft³
68°F
Heater
X Tenor
Vacuum
pump
Temperature
controller
Figure 3.4 Evacuation of a microchip
diffusion furnace.

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