Academy of Metrology and Quality Inspection Chongqing

Chongqing, China

Academy of Metrology and Quality Inspection Chongqing

Chongqing, China

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Yali A.,China Jiliang University | Xie D.,China Jiliang University | Peng X.,China Jiliang University | Xia L.,Academy of Metrology and Quality Inspection Chongqing | Shuo W.,Academy of Metrology and Quality Inspection Chongqing
Conference Record - IEEE Instrumentation and Measurement Technology Conference | Year: 2016

A double-cone flowmeter with the advantages of simple structure and easier fabrication is presented, by which some efforts have been made to measure the parameters of air-water two-phase flow. The measurement model is established for gas volume fraction through the non-dimensional analysis of characteristic values of differential pressure signals. On the basis of investigation of average differential pressures and presented measurement models, the good linear relationship is investigated between Lockhart-Martinelli constant and the quasi-ration of gas flowrate. A modified Murdock flowrate measurement model is demonstrated that is fit for the double-cone flowmeter to measure gas-liquid flow. The experiment results show that the measurement models of gas volume fraction provides good performance in a given measuring range with the errors less than 6%. The measurement errors of total mass flowrate and liquid flowrate are less than 6% by using the modified Murdock model. © 2016 IEEE.


Xia Y.,China Jiliang University | Xie D.,China Jiliang University | Xu Z.,China Jiliang University | Xia L.,Academy of Metrology and Quality Inspection Chongqing | Shuo W.,Academy of Metrology and Quality Inspection Chongqing
Conference Record - IEEE Instrumentation and Measurement Technology Conference | Year: 2016

A critical venturi nozzle with conical inlet is designed on account of the machining difficulty for the structure with circular arc entrance under small scales such as diameter less than 200μm The numerical simulation method is adopted to optimize the structure of the cirtical nozzles. The impact on the discharge coefficient of the nozzle is analyzed caused by the various geometrical parameters such as inlet angle, length of entry, throat length, divergent angle and length of divergent section. The simulation results show that the discharge coefficient is influenced by the length of the throat and inlet angle greatly. The length of the throat has negative linear correlation with discharge coefficient. The discharge coefficient may reach maximum value when the inlet angle is 17.5°. The discharge coefficient grows up as the diffusion angle increases obviously until the angle value is up to 3°. A calibration facility based on the critical nozzles is developed for the small gas flow. The performance of the facility is investigated by experiments. Test results show that the device can calibrate flowmeter ranged from 0.01 to 1.0m3/h. The expanded uncertainty of the device is 0.22%. © 2016 IEEE.

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