『Principle of differential pressure flowmeter』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)
How does a differential pressure flowmeter work?
Pressure difference P=0.5-0.07=0.43MPA. If the pipe length is L and the specific resistance of the pipeline is S, then the flow rate Q=[P/(pgSL)] ^ (1/2). A differential pressure flowmeter is an instrument for measuring flow rate. It utilizes the principle that there is a certain relationship between the pressure difference and flow rate generated when the fluid flows through the throttling device, and achieves flow measurement by measuring the pressure difference. A throttling device is a local contraction element installed in a pipeline, commonly used in orifice plates, nozzles, and Venturi tubes. The calculation formula for flow Q is blind clearing: where C is the flow coefficient; ε is the gas expansion correction coefficient; F is the cross-sectional area of the throttling section; G is the acceleration due to gravity; γ is the fluid density; P1 and P2 are the pressures before and after throttling, respectively. For incompressible gases, the gas expansion correction coefficient may not be considered, and the flow rate formula is generally determined by experimental methods as C and ε. Additional information: Differential pressure flowmeter consists of a primary device and a secondary device. The primary device is called a flow measurement element, which is installed in the pipeline of the measured fluid to generate a pressure difference proportional to the flow rate (velocity) for the secondary device to display the flow rate. The secondary device is called a display instrument. It receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow rate for display. The primary device of a differential p
2. Calculation of the relationship between pipeline pressure difference, flow rate, and flow rate
The pressure difference at the inlet and outlet of the pipeline is P=0.5-0.07=0.43MPA. If the pipe length is L and the specific resistance of the pipeline is S (which can be obtained from the inner diameter D and inner wall roughness n in the table), then the failure flow rate Q=[P/(pgSL)] ^ (1/2), flow velocity V=4Q/(3.14D ^ 2), where p represents the density of the oil; G - Acceleration due to gravity. Additional information: Differential pressure flow meters (such as orifice plates) that are commonly used in working principle are all throttling differential pressure flow meters. Its working principle is based on the two laws of mass conservation (continuity equati
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