Exercise I
91
Allow the oscillations in fluid level to reach steady values of magnitude and duration.
Select the
icon to finish data logging.
Select the
icon to create a new results sheet.
Repeat the procedure, altering the set point and logging the change in fluid level until
the oscillations reach stable values. Suggested pressure values for the set point
value are 150, 200 and 300mm. Remember to create a new results sheet for each
set of data.
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 a
half-turn anticlockwise then lock the value by pushing the knob back in.
Allow the oscillations in fluid level to reach steady values of magnitude and duration.
Alter the feed rate again by repeating the adjustment to the pressure regulator. Allow
the fluid level oscillations to stabilise again.
Continue to reduce the feed rate until the fluid level in the vessel no longer returns to
the set point level (the drain rate exceeds the inlet flow rate).
Select the
icon to finish data logging.
Effect of Inlet and Outlet Flow Rates
Investigate the effect of an inflow rate greater than the outflow rate, and of an outflow
rate greater than the inflow rate:
Decrease the outflow rate by completely closing the drain valve in the base of the
vessel. This will decrease the outflow rate compared to the inflow rate.
Select the
icon to begin data logging. Continue logging until the oscillations about
the set point value reach stable values, then select the
icon to finish data
logging.
Create a new results sheet by selecting the
icon.
Increase the outflow rate compared to the inflow rate by fully opening the drain valve.
Log the fluid level as before, and stop logging when the oscillations once more reach
stable values of magnitude and duration.
Return the drain valve to a partially closed position.
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