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《Journal of Vibration and Shock》 2015-22
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Numerical study on magnetostriction-induced cavitation flow

XIA Dong-sheng;SUN Chang-guo;YU Yan;ZHANG Hui-chen;Department of Mechanical Engineering,Dalian Maritime University;  
The magnetostriction-induced ultrasonic cavitation flow was numerically simulated by using the "Singhal full cavitation model"and the dynamic mesh technique. The computational results show that cavitation occurs at the local flow field proximate to the specimen and the specimen is subjected to the impact of impulse pressure caused by high frequency vibration of the specimen. The pressure and vapor volume fraction( VVF) are annularly distributed around the center of the specimen,and vary periodically along with the vibration. Bubbles usually collapse after twice oscillations in the center region of specimen,which results in intense impulse pressure that can reach about 5MPa. The impulse pressure forms in the interval annular zones and alternately occurs in the adjacent annular zones along with the vibration cycle.Acoustic pressure quickly attenuates as the ultrasonic wave propagates in the ultrasonic cavitation flow field. The considerable fluctuation of pressure occurs only within a distance of 20 mm to the end of ultrasonic solid horn. The impulse pressure is promoted in the central region of specimen as the vibration amplitude is increased from 25μm to 30μm. When the vibration amplitude is further increased to 35μm,the effect of cavitation is further enhanced,but the impulse pressure is weakened in the central region of specimen.
【Fund】: 国家自然科学基金资助(50975036 51275064);; 中央高校基本科研业务费专项资金(3132013063);; 辽宁省自然科学基金(2015020136)
【CateGory Index】: O353.4
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