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Title: Experimental and numerical investigations on several parameters of clamp-on ultrasonic flowmeter
Author: Hamidreza Karalaian Alireza Araee Moosa Ayati Amin Ghoshouni
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: Clamp-on ultrasonic flowmeter based on differential transit time method is widely used due to absence of moving parts, which cause no pressure drop, simplicity in installation and low cost of maintenance. In comparison with other types of flowmeters, ultrasonic transit time has higher accuracy. The accuracy of ultrasonic flowmeters severely depends on characteristics of piezoelectric transducers, which transmit and receive signals. Numerous parameters that affect signals should be carefully considered, investigated and optimized in order to improve the transducer performance. In this paper effect of several parameters on amplitude of received signal voltage were investigated based on finite element analysis with COMSOL multiphysics software. These parameters were amplitude of transmitted voltage signal, shape of piezoelectric crystal, temperature, diameter of pipe, material of pipe, beam angle and excitation frequency. In addition, some experiments were conducted to verify simulation results on the amplitude of transmitted signal and material of pipe in practice. Results of experimental and numerical study have shown linear relation between transmitted voltage amplitude and received voltage amplitude. In addition, it was observed that circular crystal achieve 18 percent larger voltage amplitude and also optimum beam angle is 33 degree.

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