Venturi flowmeter experiment | Venturi flowmeter experimental principle and calculation formula

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1. Explain through experimental curves how the flow coefficient of the Venturi flowmeter varies with flow rate. Due to its unique structural design, the Venturi flowmeter exhibits different characteristics when measuring flow rate compared to conventional orifice flowmeters. The flow coefficient of an orifice flowmeter is mainly influenced by multiple factors such as pipeline flow mode, area ratio, pressure measurement method, orifice shape, processing smoothness, orifice plate thickness, and pipe wall roughness. However, when the Reynolds number reaches a certain value, the flow coefficient is only related to the area ratio of the orifice to the pipe diameter, and other factors no longer affect the flow coefficient. Orifice flow meters are widely used in various working conditions precisely because of this. When the fluid passes through the orifice plate, a large number of vortices are formed due to the sudden expansion of the flow channel, resulting in significant resistance losses. Therefore, the flow coefficient of the orifice plate flowmeter is relatively low, usually between 0.6 and 0.7. In contrast, the design of the Venturi flowmeter allows the fluid to gradually shrink and then gradually expand as it passes through the channel, avoiding the generation of vortices and reducing resistance losses. This unique design results in a high flow coefficient for the Venturi flowmeter, typically between 0.98 and 0.99. From this, it can be seen that as the flow rate increases, the flow coefficient of the Venturi flowmeter will gradually approach its maximum value. This is because when the fluid flows through the gradually shrinking and expanding channels, the change in flow velocity is smoother, the resistance loss is smaller, and the flow coefficient gradually increases. This change pattern is of great significance for accurate measurement and control of fluid flow rate. It is worth mentioning that the variation law of the flow coefficient of the Venturi flowmeter may vary slightly under different operating conditions, but the overall trend is that as the flow rate increases, the flow coefficient tends to stabilize and approach its maximum value. This characteristic gives it unique advantages in many industrial applications, especially in situations where high-precision flow measurement is required. Overall, the variation law of the flow coefficient of the Venturi flowmeter with flow rate is mainly reflected in the fact that as the flow rate increases, its flow coefficient gradually approaches and stabilizes at a higher level. This feature is due to the unique flow channel design of the Venturi flowmeter, which can effectively reduce the resistance loss during fluid state chain flow, thereby improving the flow coefficient.

2. Experimental principle and calculation formula of Venturi flowmeter

Venturi flowmeter is a throttling flow sensor based on the Venturi effect.

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