A Brief History of Flow Measurement
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A Brief History of Flow Measurement Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. Positive-displacement flow meters accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow. Other flow measurement methods rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. Since ancient times, flow measurement is a sign of human civilization. Egyptians use the Nile River flow meter to predict the harvest is good or bad. Roman drainage pipes and water, measured by orifice flow. However, because of economic production, the end of this century, 50's, the main industrial use only orifice flow meter, pitot tube, rotmeter of three. Narrow range of measured medium, the measurement accuracy can only meet the low level of production. After World War II, with the international economy and the rapid development of science and technology, growing emphasis on flow measurement, flow meter subsequently developed rapidly. To meet the different types of fluid properties, flow under different flow measurement problems, the past 30 years, has developed and put into the meter with speed meter, volume meter, momentum flow meter, electromagnetic flow meters, ultrasonic flow of dollars and dozens of new types of flow meters. |
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