New measurement method for very low liquid flow rates using ultrasound |
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| Affiliation: | 1. National Metrology Institute of Japan, Fluid Flow Division, 1-1-4 Umezono, Tsukuba, Ibaraki 305-8563, Japan;2. KAIJO Corp., Japan;3. University of Tsukuba, Japan;1. College of Material Science and Engineering, University of Science and Technology of China, Hefei, 230026, China;2. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;3. School of Material Science and Engineering, Nanchang Hangkong University, 696 Fenghenan Avenue, Nanchang, 330063, China;1. School of Resources and Safety Engineering, Central South University, China;2. Hunan Key Lab of Resources Exploitation and Hazard Control for Deep Metal Mines, China;3. Department of Building Structures and Geotechnical Engineering, University of Seville, Spain;1. Centre for Advanced Research and Development, LIPS Research Foundation, Kozhikode, Kerala 673528, India;2. Department of Mechanical, Chennai Institute of Technology, Chennai 600069, India;1. Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany;2. Technische Universität Berlin, Department of Fluid System Dynamics, Straße des 17. Juni 135, 10623 Berlin, Germany |
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| Abstract: | A very small ultrasonic flowmeter for liquids with measuring pipe diameter down to 0.5 mm was developed using disk ultrasonic transducers. The transducer has a hole in the center and the measuring pipe passes through the hole. The vibration mode in the radial direction of the transducer was used, and ultrasound was transmitted and received from outside the pipe wall. The flowmeter can measure a liquid flow rate below 1 ml/min, which corresponds to a Reynolds number of about 40 based on the measuring pipe diameter. The standard deviation of flow rate measurement was 0.01 ml/min (1%) at the flow rate of 1 ml/min. |
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