A brief discussion on the development history of liquid flow meters

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【A brief overview of the development history of liquid flow meters】The development of flow measurement can be traced back to ancient water conservancy projects and urban water supply systems. During the time of Caesar in ancient Rome, orifice plates were already used to measure the amount of drinking water available to the residents. Around 1000 BC, ancient Egypt used weirs to measure the flow rate of the Nile River. China’s famous Dujiangyan irrigation project makes use of water level observations and flow volume measurements at the Baopingkou site. In the 17th century, Torricelli laid the theoretical foundation for differential pressure flow meters, which was a milestone in flow measurement. Since then, the prototypes of many types of flow measurement instruments from the 18th and 19th centuries began to emerge, such as weirs, tracer methods, pitot tubes, Venturi tubes, volumetric, turbine, and target flow meters. In the 20th century, the sharp increase in the demand for flow measurement in process industries, energy metering, and urban utilities spurred rapid development of measuring instruments. The significant advancements in microelectronics and computer technology greatly accelerated the upgrading of these instruments, leading to the emergence of a large number of new types of flow meters. To date, it is said that hundreds of flowmeters have been introduced to the market, and many difficult problems encountered in field use are expected to be solved. 　　 　　China started working on modern flow measurement technologies relatively late, and the flow meters required in the early stages were all imported from abroad. 　　 　　Flow measurement is the science that studies the quantitative changes in matter. The law of quantitative transformation is the fundamental principle governing the connection and development of things; therefore, its application is not limited to liquids in pipes in the traditional sense – wherever it is necessary to determine quantitative changes, flow measurement becomes relevant. Flow rate, pressure, and temperature are listed as the three main parameters for measurement. For a given fluid, its energy can be calculated as long as these three parameters are known; these three parameters must be measured in the assessment of energy conversion. Energy conversion is the foundation of all production processes and scientific experiments; therefore, flow meters are used as widely as pressure and temperature instruments.