The Experts below are selected from a list of 1548 Experts worldwide ranked by ideXlab platform
Zhiqiang Sun - One of the best experts on this subject based on the ideXlab platform.
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mass flow measurement of gas liquid bubble flow with the combined use of a Venturi Tube and a vortex flowmeter
Measurement Science and Technology, 2010Co-Authors: Zhiqiang SunAbstract:Development of effective techniques for gas–liquid two-phase flow measurement is of interest to both academic research and industrial applications. This paper presents a novel approach to the measurement of the mass flow rate of homogeneous gas–liquid bubble flow with the combined use of a Venturi Tube and a vortex flowmeter. The Venturi Tube and the vortex flowmeter were mounted in the same pipeline with a spacing interval of ten times the pipe's inner diameter. A measurement correlation was established based on the differential pressure generated across the Venturi Tube and the frequency extracted from the vortex flowmeter signal. Experiments were conducted on a vertical upward gas–liquid two-phase flow rig under the bubble flow pattern, with the air mass flow rate from 0.2 × 10−3 to 3.2 × 10−3 kg s−1, the water mass flow rate from 3.3 to 5.2 kg s−1 and the volumetric void fraction from 0.004 to 0.246. The results show that the relative errors of the correlation for the mixture mass flow rate measurement were within ±5%, and the maximum standard deviation of the relative errors was 2.0%. This method provides a simple and practical solution to the mass flow measurement of homogeneous gas–liquid bubble flows.
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Mass flow measurement of gas?liquid bubble flow with the combined use of a Venturi Tube and a vortex flowmeter
Measurement Science and Technology, 2010Co-Authors: Zhiqiang SunAbstract:Development of effective techniques for gas–liquid two-phase flow measurement is of interest to both academic research and industrial applications. This paper presents a novel approach to the measurement of the mass flow rate of homogeneous gas–liquid bubble flow with the combined use of a Venturi Tube and a vortex flowmeter. The Venturi Tube and the vortex flowmeter were mounted in the same pipeline with a spacing interval of ten times the pipe's inner diameter. A measurement correlation was established based on the differential pressure generated across the Venturi Tube and the frequency extracted from the vortex flowmeter signal. Experiments were conducted on a vertical upward gas–liquid two-phase flow rig under the bubble flow pattern, with the air mass flow rate from 0.2 × 10−3 to 3.2 × 10−3 kg s−1, the water mass flow rate from 3.3 to 5.2 kg s−1 and the volumetric void fraction from 0.004 to 0.246. The results show that the relative errors of the correlation for the mixture mass flow rate measurement were within ±5%, and the maximum standard deviation of the relative errors was 2.0%. This method provides a simple and practical solution to the mass flow measurement of homogeneous gas–liquid bubble flows.
Yi Li - One of the best experts on this subject based on the ideXlab platform.
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Experimental measurement of oil–water two-phase flow by data fusion of electrical tomography sensors and Venturi Tube
Measurement Science and Technology, 2017Co-Authors: Yuchi Deng, Peining Yu, Maomao Zhang, Yi LiAbstract:Oil–water two-phase flows are commonly found in the production processes of the petroleum industry. Accurate online measurement of flow rates is crucial to ensure the safety and efficiency of oil exploration and production. A research team from Tsinghua University has developed an experimental apparatus for multiphase flow measurement based on an electrical capacitance tomography (ECT) sensor, an electrical resistance tomography (ERT) sensor, and a Venturi Tube. This work presents the phase fraction and flow rate measurements of oil–water two-phase flows based on the developed apparatus. Full-range phase fraction can be obtained by the combination of the ECT sensor and the ERT sensor. By data fusion of differential pressures measured by Venturi Tube and the phase fraction, the total flow rate and single-phase flow rate can be calculated. Dynamic experiments were conducted on the multiphase flow loop in horizontal and vertical pipelines and at various flow rates.
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Experimental measurement of oil-water two-phase flow by data fusion of electrical tomography sensors and Venturi Tube
Measurement Science and Technology, 2017Co-Authors: Yinyan Liu, Yuchi Deng, Peining Yu, Maomao Zhang, Yi LiAbstract:© 2017 IOP Publishing Ltd. Oil-water two-phase flows are commonly found in the production processes of the petroleum industry. Accurate online measurement of flow rates is crucial to ensure the safety and efficiency of oil exploration and production. A research team from Tsinghua University has developed an experimental apparatus for multiphase flow measurement based on an electrical capacitance tomography (ECT) sensor, an electrical resistance tomography (ERT) sensor, and a Venturi Tube. This work presents the phase fraction and flow rate measurements of oil-water two-phase flows based on the developed apparatus. Full-range phase fraction can be obtained by the combination of the ECT sensor and the ERT sensor. By data fusion of differential pressures measured by Venturi Tube and the phase fraction, the total flow rate and single-phase flow rate can be calculated. Dynamic experiments were conducted on the multiphase flow loop in horizontal and vertical pipelines and at various flow rates.
Xinping Long - One of the best experts on this subject based on the ideXlab platform.
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One-dimensional/three-dimensional analysis of transient cavitating flow in a Venturi Tube with special emphasis on cavitation excited pressure fluctuation prediction
Science China-technological Sciences, 2019Co-Authors: Luyan Wang, Huaiyu Cheng, Jiong Wang, Xinping LongAbstract:The large eddy simulation (LES) method is used to simulate cavitating flow in a Venturi Tube. The simulated results agree fairly well with the experimental data. To quantitatively describe the relationship between cavitation evolution and excited pressure fluctuation in the Venturi Tube, a modified prediction model is proposed and its accuracy is verified by the LES results. Based on the original one-dimensional model for the external cavitating flow around a hydrofoil, this model is corrected according to the internal cavitating flow characteristics in the Venturi Tube. The results show that the original one-dimensional model ignores the choking effect of cavitating flow, which is obvious in a Venturi Tube with a narrow flow channel, thus leading to an inaccurate prediction of pressure fluctuation in the Venturi Tube. The modified model can significantly overcome its deficiencies and improve the accuracy of the pressure fluctuation prediction, providing a theoretical basis and guidance for engineering application to controlling the pressure fluctuation in a Venturi Tube or for other internal flows.
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experimental investigation of the global cavitation dynamic behavior in a Venturi Tube with special emphasis on the cavity length variation
International Journal of Multiphase Flow, 2017Co-Authors: Jiong Wang, Xinping Long, Junqiang Zhang, Qiao LyuAbstract:Abstract Experiments were conducted to investigate the global cavitation behavior in a Venturi Tube. Images of various cavitation stages were captured and analyzed to study the development characteristics of the cavity length and the factors influencing the cavity growth. The results show that once cavitation occurs, the flow rate remains almost constant regardless of the outlet pressures variations, and the pressure ratio and cavitation number are linearly related. Cavitation occurs each time regardless of the inlet or outlet pressure at the same critical pressure ratio of 0.89, which corresponds to a critical cavitation number of 0.99. The cavity length is only the function of the pressure ratio or the cavitation number independent of the inlet pressures. The development tendency of the cavitation structure and the cavity length can be divided into two sections by a transition pressure ratio of 0.47 (corresponding to a transition cavitation number of 0.51). When the pressure ratio is greater than the transition value, the upper and lower parts of the cavity cloud do not touch each other yet and the cavity length increases relatively slowly as the pressure ratio decreases. Below the transition value, the upper and the lower parts of the cavity cloud meet along the centerline and the cavitation becomes more sensitive to the decreasing outlet pressure resulting in the cavity length increasing faster. However, the cavity lengths in the both parts are linearly related to the pressure ratios or cavitation numbers.
Xin Gong - One of the best experts on this subject based on the ideXlab platform.
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design optimization of a Venturi Tube geometry in dense phase pneumatic conveying of pulverized coal for entrained flow gasification
Chemical Engineering Research & Design, 2017Co-Authors: Xiaolei Guo, Kai Liu, Xin GongAbstract:Abstract The use of a Venturi Tube to sustain the pipeline pressure in the dense-phase pneumatic conveying of pulverized coal system is promising for its application to the pressurized entrained-flow coal gasification process, in spite of the limited knowledge of the fundamentals of the gas–solid flow through the Venturi Tubes at high-pressure and dense-phase pneumatic transport conditions. In this paper, a series of experiments were carried out and the geometry parameters of the Venturi Tube, including the convergent angle, the throat diameter, the throat length and the diffuser angle were varied at constant flow conditions to evaluate their effect on the conveying properties and on the pressure reduction effects in the flow of gas–solid mixtures through the Venturi Tube. The optimum values or ranges of the above mentioned Venturi geometrical parameters in the application of Venturi Tubes to dense-phase pneumatic conveying of pulverized coal are determined in this work. These values will provide a useful reference for the design of feeding systems in the pressurized entrained-flow coal gasification process.
Xiaolei Guo - One of the best experts on this subject based on the ideXlab platform.
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design optimization of a Venturi Tube geometry in dense phase pneumatic conveying of pulverized coal for entrained flow gasification
Chemical Engineering Research & Design, 2017Co-Authors: Xiaolei Guo, Kai Liu, Xin GongAbstract:Abstract The use of a Venturi Tube to sustain the pipeline pressure in the dense-phase pneumatic conveying of pulverized coal system is promising for its application to the pressurized entrained-flow coal gasification process, in spite of the limited knowledge of the fundamentals of the gas–solid flow through the Venturi Tubes at high-pressure and dense-phase pneumatic transport conditions. In this paper, a series of experiments were carried out and the geometry parameters of the Venturi Tube, including the convergent angle, the throat diameter, the throat length and the diffuser angle were varied at constant flow conditions to evaluate their effect on the conveying properties and on the pressure reduction effects in the flow of gas–solid mixtures through the Venturi Tube. The optimum values or ranges of the above mentioned Venturi geometrical parameters in the application of Venturi Tubes to dense-phase pneumatic conveying of pulverized coal are determined in this work. These values will provide a useful reference for the design of feeding systems in the pressurized entrained-flow coal gasification process.
