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1. Formula for differential pressure flowmeter?
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 pr
2. Principle and formula of orifice plate differential pressure flowmeter
Principle and formula of orifice plate differential pressure flowmeter: The orifice plate differential pressure flowmeter consists of a throttling device, a pressure pipe, and a differential pressure gauge. Its working principle is based on the throttling principle of fluid flow, which means that when fluid flows in a pipeline with a throttling device, a static pressure difference will be generated at the pipe wall before and after the throttling device. Specifically, when a fluid flows in a pipeline, it has two forms of energy: static pressure energy and kinetic energy. In the absence of external energy, according to the law of conservation of energy, the sum of static pressure energy and ki
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