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Experimental Report on Venturi Flow Meter

『Experimental Report on Venturi Flow Meter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. Working principle of Venturi flowmeter

The basic principle of Venturi flowmeter is that the fluid in the Venturi flowmeter pipeline is filled with it. When it flows through the throttling element in the Venturi flowmeter pipeline, the flow velocity will form a local contraction at the throttling element of the Venturi flowmeter, resulting in an increase in flow velocity and a decrease in static pressure. As a result, a pressure difference is generated in the chamber balance before and after the throttling element of the Venturi flowmeter. The larger the fluid flow rate, the greater the pressure difference generated, which can be used to measure the flow rate. This measurement method is based on the flow continuity equation (law of conservation of mass) and Bernoulli equation (law of conservation of energy). The magnitude of pressure difference is not only related to the flow rate but also to many other factors, such as when the form of the throttling device of the Venturi flowmeter or the physical properties (density, viscosity) of the fluid inside the Venturi flowmeter pipeline are different, the pressure difference generated at the same flow rate is also different.

2. Experimental Principles of Aerodynamics

The laws of fluid dynamics are extensive and constantly evolving, but the measurement of fluid velocity, flow rate, and various measuring instruments composed of them, as well as the lift generated during high-speed wing operation and the thrust generated during rocket injection, all follow the two fundamental laws of fluid dynamics.

. If the compression factor of the fluid is ignored in the continuity equation, when the fluid flows steadily in a closed pipeline, the mass of the fluid
Experimental Report on Venturi Flow Meter
flowing into a certain section () per unit time must be equal to the mass of the fluid flowing out of another section () (i.e., the flow rate is equal), that is, the Bernoulli equation. In steady flow, the pressure of the fluid at any point in a closed pipeline follows the Bernoulli equation. The Pitot tube is an instrument used to measure the flow velocity at any point in a moving fluid, and its structure is shown in the following figure. The pitot tube consists of two flow tubes. The head of the central tube is perforated to measure the total pressure of the incoming flow, while the outer tube has several small holes on the side wall to measure the static pressure at that location. The tail ends of the two tubes are connected to the inclined tube liquid pressure gauge with flexible hoses, serving as test joints for total pressure and static pressure. According to the Bernoulli equation, flow velocity is calculated by the difference between total pressure and static pressure, i.e. dynamic pressure. The Venturi tube is composed of a converging tube, a throat tube, and a diverging tube (as shown in the figure below). The cross-section of the tapered tube rapidly decreases, while the cross-section of the tapered tube gradually increases and returns to its original cross-section. The smallest section of the broken fiber void is the throat. The Venturi tube can be used to verify continuity equations and Bernoulli equations. According to the continuity equation and Bernoulli equation, there is a clear relationship between the velocity and pressure of the airflow at various locations in the Venturi tube. The velocity is highest at the throat of the Venturi tube, while the pressure is lowest. The Venturi flowmeter is also an i

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