Xuemei Geng, Jieqiang Ji, Guofu Chen, Ningning Zhang, Yan Fang, Xiaojie Wu, Zhiyu Fang
The portable clamp-on ultrasonic flowmeters are now widely used for on-line measurement in water resource systems, due to the advantages of convenience, economy and safety. However, the measurement accuracy of the clamp-on ultrasonic flowmeter is affected by various factors. During the on-line measurement process, the flow field distributions inside the pipeline have a greater impact on the measurement accuracy. The slope of the pipe and the opening degree of the valve are the two factors that affect the distributions of the flow field inside the pipe. To study the influences of these two...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.027
· Download
Min Wei, Zhu Rui
On the current domestic market, a variety of ultrasonic flowmeters, including those with four (sound) channels, six channels, and eight channels, either through-beam and retro-reflective in channel arrangement, are all claimed to be extremely adaptable to baffle interference and have shorter straight pipes than required by the national standard. To observe and study the tolerance of these gas ultrasonic flowmeters to typical baffle interference and the requirements on the length of the front straight pipe segment, our technical team, according to the process installation requirements of...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.026
· Download
Lide Fang, Bangbang Han, Cong Zhou
Void fraction as one of the basic parameters of gas-liquid two-phase flow is of great significance to the development and transportation of petroleum pipelines and the design of nuclear reactor cooling towers. Thispaper proposes a void fraction detection method based on PIV technology, which can obtain the velocity distribution and void fraction of the cross-section at the same time. During the experiment, the truth-value of void fraction of the cross section is obtained by installing an endoscopic camera at the back of the test section. The deviation of the void fraction obtained by the two...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.025
· Download
Hong XU, Chunhua SHENG, Lin LI, Yu LIU, Xiaoyan Song
The electromagnetic flowmeter is one of the most important hydraulic structures to measure the water flow in closed conduits. Based on the collected current and latest electromagnetic flowmeter standards at home and abroad, this paper gives a comparative analysis of the technical parameters of electromagnetic flowmeters, including product parameters, measurement parameters and metrological parameters, classified by product standards, measurement standards and metrological standards. The results show that there are some differences among the technical parameters of these standards at home and...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.024
· Download
Xuejing Li, Xinhong Yao, Haiyang Li
Liquid lead-bismuth eutectic (LBE) is one of the preferred materials for accelerator driven subcritical(ADS) transmutation targets and coolants in fourth-generation nuclear reactors. Due to the complex and interacting physical and chemical factors in the measurement process of LBE in high temperature operating environment, it is very difficult to control the flow and on-line calibration, resulting in the slow development of LBE flow meter technology, which hinders the fourth Generation nuclear reactor technology development. Electromagnetic flowmeter is currently recognized as one of the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.023
· Download
E. Frahm, J. Wright
The primary purpose of inter-laboratory comparisons is to demonstrate that the uncertainty specifications of the calibration measurement capabilities of the participating laboratories are correct. The most common criterion for assessing a participating laboratory’s results is whether the normalized error |Eni| is ≤ 1. Most comparison reports we reviewed properly include uncertainty components related to the transfer standard (uTs ) and the repeatability of the calibrations (urepeati ) in the uncertainty of the value reported by a participant. Unfortunately, high values for either uTs and...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.022
· Download
J. Geršl, A. Niemann, H. Bissig, E. Batista, H. Kjeldsen, O. Büker, K. Stolt, E. Graham, S.H. Lee, J. Afonso, M. Benková, S. Knotek, M. Zagnoni, R. Vroman, J. Schroeter
Almost every medical department at hospitals all around the world uses infusion devices to administrate fluids, nutrition, and medications to patients for the treatment of numerous different diseases and ailments. Depending on the intended use of the equipment e.g., if it is used for anaesthesia of adults or for medical treatment of premature infants, the accuracy of the equipment can be more or less important. A well-defined metrological infrastructure can help to ensure that infusion devices function properly and are as accurate as needed for their use. However, to establish a metrological...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.021
· Download
O. Büker, K. Stolt, C. Kroner, H. Warnecke, L. Postrioti, Andrea Piano, G. Hagemann, M. Werner
Type approval testing of vehicles on chassis dynamometers, or experiments at the engine tests bench, require a precise measurement of the time-dependent fuel consumption, that is usually carried out by means of flow meters. However, the performance of these instruments can be jeopardized considering both the range of flow rate and its high dynamicity. In addition, the adoption of innovative fuels, such as biofuels and synthetic fuels, is nowadays of increasing interest thanks to their potential in pollutant emission reduction. Therefore, flow meters should depend as little as possible on the...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.020
· Download
Lulu Zhang, Chunyang Yu, Yue Zhang, Menglan He, Wei Wang
The reference leak is divided into positive pressure reference leak and vacuum reference leak.In order to calibrate the leak rate of the positive pressure reference leak, a calibration device for reference leak value by soap film flowmeter was built, which can calibrate the positive pressure reference leak. The calibration device is composed of the automatic control part of the air source pressure, the measured reference leak and the standard soap film flowmeter. The device is used to calibrate reference leaks with a flow range from 1mL/min to 10L/min and a pressure range of positive...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.019
· Download
Lingshan Yang, Xin Liu, Yang Xiang, Meimei Jian, Weihui Zhou
Some gas flowmeters such as standard wet gas meter and critical flow Venturi nozzles are often used in the main standard of standard facility, and their accuracy is high, so its value transmission is particularly important. This paper introduces an active piston gas flow standard device. This paper introduces an active piston gas flow standard facility, which is composed of three active pistons and used in series. The measuring range can reach (0.01 ~ 128) m³/h, and the pistons can be automatically switched according to the required flow during the detection process. According to JJF...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.018
· Download