Xianwei Yuan - Academia.edu (original) (raw)
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Papers by Xianwei Yuan
2018 IEEE International Ultrasonics Symposium (IUS), 2018
Power ultrasound that uses the local high-temperature and high-pressure environment generated by ... more Power ultrasound that uses the local high-temperature and high-pressure environment generated by ultrasonic cavitation to accelerate or change the chemical reaction process has been widely used in the petrochemical industry. Unfortunately, huge heat is inevitably conducted by tool head and ultrasonic horn to the piezoelectric ceramics while the transducer is dealing with high-temperature liquid medium such as the pitch of 180°C. In order to prevent the heat influencing the piezoelectric ceramics, a novel high-temperature high power sandwich piezoelectric ultrasonic transducer is proposed. The frequency equations of the ultrasonic vibrator are deduced and the corresponding correctness is verified by the modal through the finite element method (FEM)and COMSOL software. In addition, the heat conduction in the transducer while dealing with high-temperature liquid is analyzed by FEM analysis to ensure the temperature of piezoelectric ceramics is below the Curie temperature. Finally, an experimental prototype is manufactured and a high-temperature liquid medium experiment has been implemented. It indicates that the ultrasonic transducer designed in this study is proved to be able to work stably in the 180°C oil bath.
Proceedings of Meetings on Acoustics, 2017
Experimental study of aging oil viscosity reduction caused by ultrasound Properties of crude oil ... more Experimental study of aging oil viscosity reduction caused by ultrasound Properties of crude oil are affected by its own components and the external environment. During the transportation of crude oil, aging oil is easy to be formed, which performs ultra-high viscosity. This makes it difficult to be transported effectively. In addtion, the viscosity of aging oil is difficult to be reduced by chemical agent and traditional methods. In this study, the aging oil from Daqing Oilfield is treated by ultrasound and the corresponding viscosity reduction is evaluated by measuring the viscosity-temperature curve. The effects of treatment duration, ultrasonic power density and vibration mode are investigated. The results show that the viscosity of aging oil decreases with increasing the ultrasonic power density and treatment duration obviously. Typically, the viscosity of aging oil at 20℃ decreases from 13657 mPa·s to 3039 mPa·s when the treatment duration is 2 minutes. Comparing with the aging oil treated by horn ultrasonic transducer, the aging oil treated by radial ultrasonic transducer shows lower viscosity. In addition, the viscosity reduction effect of aging oil caused by ultrasound can be kept for a long period (e.g., a few days), but it disappears after the aging oil is reheated.
2018 IEEE International Ultrasonics Symposium (IUS), 2018
Power ultrasound that uses the local high-temperature and high-pressure environment generated by ... more Power ultrasound that uses the local high-temperature and high-pressure environment generated by ultrasonic cavitation to accelerate or change the chemical reaction process has been widely used in the petrochemical industry. Unfortunately, huge heat is inevitably conducted by tool head and ultrasonic horn to the piezoelectric ceramics while the transducer is dealing with high-temperature liquid medium such as the pitch of 180°C. In order to prevent the heat influencing the piezoelectric ceramics, a novel high-temperature high power sandwich piezoelectric ultrasonic transducer is proposed. The frequency equations of the ultrasonic vibrator are deduced and the corresponding correctness is verified by the modal through the finite element method (FEM)and COMSOL software. In addition, the heat conduction in the transducer while dealing with high-temperature liquid is analyzed by FEM analysis to ensure the temperature of piezoelectric ceramics is below the Curie temperature. Finally, an experimental prototype is manufactured and a high-temperature liquid medium experiment has been implemented. It indicates that the ultrasonic transducer designed in this study is proved to be able to work stably in the 180°C oil bath.
Proceedings of Meetings on Acoustics, 2017
Experimental study of aging oil viscosity reduction caused by ultrasound Properties of crude oil ... more Experimental study of aging oil viscosity reduction caused by ultrasound Properties of crude oil are affected by its own components and the external environment. During the transportation of crude oil, aging oil is easy to be formed, which performs ultra-high viscosity. This makes it difficult to be transported effectively. In addtion, the viscosity of aging oil is difficult to be reduced by chemical agent and traditional methods. In this study, the aging oil from Daqing Oilfield is treated by ultrasound and the corresponding viscosity reduction is evaluated by measuring the viscosity-temperature curve. The effects of treatment duration, ultrasonic power density and vibration mode are investigated. The results show that the viscosity of aging oil decreases with increasing the ultrasonic power density and treatment duration obviously. Typically, the viscosity of aging oil at 20℃ decreases from 13657 mPa·s to 3039 mPa·s when the treatment duration is 2 minutes. Comparing with the aging oil treated by horn ultrasonic transducer, the aging oil treated by radial ultrasonic transducer shows lower viscosity. In addition, the viscosity reduction effect of aging oil caused by ultrasound can be kept for a long period (e.g., a few days), but it disappears after the aging oil is reheated.