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V en tu r i A p p ar a tu s
Appendix B: Fluid Supply and Flow Rate
Measurement Options
You can conduct the experiment using air or water as the fluid. In either case, you
have a range of options for how to handle the fluid and how to measure the flow rate.
Some of the possibilities are described in this appendix.
In many of these setups, a PASPORT sensor is used to measure the flow rate. You can
connect this sensor and the Quad Pressure Sensor to a single multi-port interface
(such as the Xplorer GLX or PowerLink) or use two single-port interfaces connected
to your computer. If you have only one single-port interface, measure the flow rate
and pressures in two separate data runs.
Air
Air Supply Method 1: Shop Vacuum
Included Parts Required
Rubber stopper with hole
Other Parts Required
Shop vacuum or similar air supply
This method will typically produce a flow rate of 2 L/s or more.
Use a shop vacuum cleaner (Shop-Vac
model will work, but one that has a hose connection for blowing air out may be pref-
erable since it can push (as well as suck) air through the apparatus. Air supplies
designed for airtracks will work, but they may produce less air flow than a shop vac-
uum.
The Venturi Apparatus includes two rubber stoppers with holes. Use one of them to
connect the hose of the shop vacuum to the inflow port of the apparatus (see Figure
5). Connect the hose to the air-blowing port of the shop vacuum.
To measure airflow, connect a spirometer sensor as described on page 9.
Note: Observe the correct direction of airflow through the apparatus indicated in Figure 5. If you
will be using the shop vacuum to suck air through the apparatus, connect it to the outflow port,
and connect the spirometer to the inflow port.
To Quad Pressure channels: 1
Shop vacuum hose
Rubber
stopper
8
012-09486B A pp en d i x B : Fl ui d S u pp l y a n d Fl ow R at e
®
brand or similar) as an air supply. Almost any
2
3
Airflow
Figure 5: Setup for air with a shop vacuum
4
Spirometer tubing
Rubber
stopper
Spirometer
®
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