A venturi meter is a device that measures flow by using the venturi effect, which is when pressure is reduced due to a liquid flowing through a constricted section of pipe. As a fluid passes through the venturi, the cross sectional area is decreased, which causes the fluid velocity to increase. This corresponds to a decrease in pressure. The continuity equation, a principle of the conservation of energy, states that a fluid's velocity must increase through constriction. Using this principle, the flow rate of the fluid can be determined by measuring the upstream and downstream pressures.
- 2 1-inch threaded PVC tees with 1/4-inch branch
- 2 1-inch to 1/2-inch threaded PVC reducers
- 1/2-inch threaded PVC pipe (2 inches long)
- 2 pressure gauges with 1/4-inch threaded connection
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Instructions
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1
Thread the PVC reducer into the end of one of the PVC tees. Add the 1/2-inch PVC pipe to the end of the reducer. Thread the second reducer to the other end of the PVC pipe.
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2
Thread the second PVC tee onto the end of the second PCV reducer. The venturi pipe should have the 1-inch tee attached to the reducer down to a 1/2-inch pipe, and then back to the second 1-inch tee.
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3
Install the pressure gauges into each of the tee branches. Attach one end of the venturi meter to a fluid source. As the fluid flows through the venturi meter, record the readings on each pressure gauge.
