18
P. Liu
Fig. 1.17 Venturi flow tube
Fig. 1.18 Principle of Venturi flowmeter
equation and continuity equation between upstream section 1-1 and throat
section 3-3 are established, and the flow calculation formula through the
pipeline is obtained as follows:
V 3 =
μ
1 − d 4
3 /d 4
1
2gh, Q = V 3 A 3
where d 1 is the diameter of the upstream section, d 3 is the diameter of throat
section, Q is the flow through the pipeline, h is the head difference between
the upstream section and throat section (measured by test), and μ is the
Venturi flow coefficient (generally between 0.95 and 0.99).
P. Liu
Fig. 1.17 Venturi flow tube
Fig. 1.18 Principle of Venturi flowmeter
equation and continuity equation between upstream section 1-1 and throat
section 3-3 are established, and the flow calculation formula through the
pipeline is obtained as follows:
V 3 =
μ
1 − d 4
3 /d 4
1
2gh, Q = V 3 A 3
where d 1 is the diameter of the upstream section, d 3 is the diameter of throat
section, Q is the flow through the pipeline, h is the head difference between
the upstream section and throat section (measured by test), and μ is the
Venturi flow coefficient (generally between 0.95 and 0.99).