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In the application of ultrasonic flowmeter, flow measurement has a low accuracy, since the length of straight pipe near the ultrasonic sensor is insufficient, especially the presence of the upstream disturbance. In this paper, in order to analyze the inherent relationship between the measurement error and the characteristics of flow field, two flow diagnostic criterions are proposed: asymmetry index...
It is researched about the measurement characteristics of vortex flowmeter in air-water vertical upward two phase flow in this paper. The diameter of the pipeline is 50 mm, the flow velocities of the water vary from 0.849 m/s to 1.415 m/s and the void fraction of the gas is 1% to 20%. According to the experimental results, the repeatability of the vortex flowmeter can be used as a criterion for the...
Electrical capacitance tomography (ECT) technique is a new technique for two-phase flow measurement. This paper describes the basic principles of ECT. Forward and inverse problem of ECT are analyzed in detail. The conventional image reconstruction algorithm, i.e., linear back projection algorithm has been given. Then, the new image reconstruction algorithm for ECT based on radial basis function (RBF)...
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