Experiment purpose

To understand Venturi meter and orifice plate flowmeter experiment set and principle.

Draw pressure difference and flow relationship curve, confirm Venturi meter and orifice plate flowmeter discharge coefficient μ value.

Experiment principle

Venturi meter is widely applied in normal flowmeter in industrial tube, it contains three parts: contraction section, venturi, diffuser. Due to water section constriction, lead to contraction section front and back section pressure difference, and generate bigger potential energy difference, venturi active cross-section water flow energy increase, potential energy decrease, this potential energy difference can be calculated by differential pressure gauge.

Orifice plate flowmeter principle is the same as Venturi meter, according to energy equation and barometric surface principle will get the head loss Venturi meter(orifice plate flowmeter) flow equation Regardless of the head loss:

For Venturi meter:

For orifice plate flowmeter:

According to experiment equipment conditioner, the tube real measured value can be measured by volumetric method or by electronics flow meter.