Experimental Study on Flow Rate Measurement Downstream of an Elbow Pipe using the Clamp-on ultrasonic Flowmeter |
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| S. Wada, N. Furuichi, H. Hamada, T. Akama, T. Yamaguchi, S. Suzuki, S. Takatsuka |
- Abstract:
- This paper presents experimental measurements using the clamp-on ultrasonic flowmeter. To obtain an uncertainty of flow rate measurement using the clamp-on ultrasonic flowmeter, experiments are carried out at the national standard calibration facility of water flow rate in Japan (the National Institute of Advanced Industrial Science and Technology, National Metrology Institute of Japan). Flow rate given by the clamp-on ultrasonic flowmeter is compared with the static gravimetric method using a tank system weighing 50 t. The uncertainty of the reference flow rate given by the 50 t weighing tank system is 0.060% (k = 2). The transducers of clamp-on ultrasonic flowmeter are mounted downstream of an elbow pipe. The length from the elbow to the transducers is five times of the pipe diameter and ten times of the pipe diameter, respectively. The curvature radius of the elbow is equal to the pipe diameter. Flow rate measurement is based on a time of flight of pulsed ultrasound. The multi-pass mode of the clamp-on ultrasonic flowmeter is used to measure the disturbed flow condition, and the number of ultrasound pass is up to four. The pipe is made of stainless steel with the outer diameter of 216.3 mm and the thickness is 6.5mm. The flow rate condition is from 100 m³/h to 700 m³/h. The results show that the clamp-on ultrasonic flowmeter using the multi-pass mode can measure the flow rate accurately, even if the velocity profiles are disturbed by the upstream elbow pipe.
- Download:
- IMEKO-TC9-2019-103.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2019
- Title:
18th International Flow Measurement Conference 2019
- Place:
- Lisbon, PORTUGAL
- Time:
- 26 June 2019 - 28 June 2019