Exercise B
61
Disturbances
Within the software it is possible to introduce disturbances in the outflow from the
vessel by opening the Normally Closed solenoid valves SOL 2 and SOL 3.
Create a new results sheet by selecting the appropriate icon in the tool bar of the
software.
Select the
icon to begin data logging.
In the software, select the switch to open valve SOL 2.
Allow the fluid level oscillations to settle.
Open valve SOL 3. Both SOL2 and SOL3 should now be open
Note whether the fluid level oscillates around the set point or whether the fluid
continues to drain from the process vessel.
Close both valves SOL 2 and SOL 3 and allow the fluid to return to the set point.
Select the
icon to finish data logging.
Feed Rate
Create a new results sheet by selecting the icon in the tool bar of the software.
Select the
icon to begin data logging.
To change the inlet feed rate, adjust the pressure regulator on the inlet pipe of the
apparatus:
Pull the knob outwards from the body of the regulator.
Turn the knob gradually anticlockwise to reduce the indicated flow rate to 1000ml/min
(or to a value that is approximately 2/3 of the previous flow rate if this was less than
1400ml/min).
Lock the value by pushing the knob back in.
Allow the oscillations in fluid level to reach steady values of magnitude and duration.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Select the
icon to begin data logging
Alter the feed rate to 700ml/min (or to half the original flow rate if this was less than
1400ml/min).
Allow the fluid level oscillations to stabilise again.
Select the
icon to finish data logging.
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