Question

2. [2 points] For the microchip diffusion furnace problem that we did in class (see below), now assume that there is a steady leak of air into the tank at a rate of 0.001 Lbm/min. Remember that the furnace 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. Plot the pressure-time profile, starting by calculating the final pressure of the system after 30, 60, 90, 120 minutes, etc. Q = 1.0 ft³/min Volume 10 ft³ 68°F Heater Vacuum pump Temperature controller

          2. [2 points] For the microchip diffusion furnace problem that we did in class (see
below), now assume that there is a steady leak of air into the tank at a rate of 0.001
Lbm/min. Remember that the furnace 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. Plot the pressure-time profile, starting
by calculating the final pressure of the system after 30, 60, 90, 120 minutes, etc.
Q = 1.0 ft³/min
Volume 10 ft³
68°F
Heater
Vacuum pump
Temperature
controller

Added by Ryan D.

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