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『Venturi flowmeter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
1. Experimental principle and calculation formula of Venturi flowmeter
The experimental principle of Venturi flowmeter is based on the Venturi effect and Bernoullis law, and the calculation formula mainly involves the calculation of flow rate Q. Experimental principle: Venturi effect: When a fluid passes through a gradually contracting pipeline, the flow velocity will significantly increase. This is due to the decrease in cross-sectional area of the pipeline, which causes the fluid to accelerate in order to maintain continuity. Bernoullis law: In constant flow, an increase in velocity is accompanied by a decrease in pressure. The Venturi tube utilizes this principle to calculate flow rate by measuring the pressure difference between the Zen chain stop before and after the contraction section. Calculation formula: Basic flow formula: Without considering resistance, the flow rate Q can be calculated by the inner diameter d of the pipeline, the flow velocity difference, and the head difference Δ h. The formula is Q=d2/Δ h. However, please note that v1 and v2 refer to the flow velocity before and after the contraction segment, respectively, and this formula is a theoretical value. In practical applications, resistance needs to be considered. Actual flow formula: Due to the presence of resistance in the actual pipeline, the actual flow rate Q will be lower than the theoretical value. Therefore, it is necessary to introduce the flow coefficient μ for correction, with the formula Q=Q theory/μ. The value of μ is calculated by experimentally measuring the flow rate and head difference. When conducting experiments with a Venturi flowmeter, it is necessary to follow certain steps and pay attention to relevant matters to
2. What is the principle of a Venturi flowmeter and how to measure flow rate?
The principle of a Venturi flowmeter is based on the law of conservation of energy, Bernoulli equation, and flow continuity equation. The flow rate is determined by measuring the pressure difference generated when the fluid flows through the contraction section.
. Specifically, the working principle is that when the fluid flows through the contraction section of the Venturi flowmeter pipeline, the flow velocity increases and the static pressure decreases, resulting in a pressure difference before and after the flowmeter. This pressure difference is directly proportional to the fluid flow rate, and it is possible to accurately determine the magnitude of the fluid flow rate by measuring the pressure difference. The high precision and stability of the Venturi flowmeter are attributed to its unique core body, which has a geometric contour similar to the inner surface of the classical Venturi tube on the radial outer surface, effectively rectifying the velocity distribution of the fluid inside the tube before throttling. The operation process of using a Venturi flowmeter to measure flow: Preparation stage: Ensure that the measured water level is stable. Slowly open the flow control valve, overflow valve, and drain valve clockwise, start the water pump to supply water to each water tank until the water tank reaches the overflow state. Exhaust stage: Slowly close the flow control valve counterclockwise and exhaust the air in the test pipe section until the water level of all pressure gauges glass tubes is consistent. Measurement stage: Slowly open the flow adjustment valve to the approp