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	Effect of hydrodynamic pressures near solid surfaces in the incubation stage of cavitation erosion
	Chen, S. ; Wang, J.D. ; Li, Y.J. ; Chen, D.R.
	2010-10-12 ; 2010-10-12
关键词	Practical Experimental/ bubbles cavitation computational fluid dynamics hydrodynamics jets liquid films shock waves steel ultrasonic applications vibrations wear/ hydrodynamic pressure ultrasonic vibration cavitation erosion incubation stage steel specimen numerical analysis Reynolds equation fluid film bubble collapse process microjet erosion pits shock waves computational fluid dynamics FeCJk/ A4785 Applied fluid mechanics A4710 General fluid dynamics theory, simulation and other computational methods A4755B Cavitation A4755C Jets in fluid dynamics A4740N Shock-wave interactions A4755K Multiphase flows E2130 Fluid mechanics and aerodynamics (mechanical engineering) E2140 Tribology (mechanical engineering) E1710 Engineering materials E2180D Vibrations and shock waves (mechanical engineering) E2170 Acoustic properties (mechanical engineering)/ Fe/ss C/ss
中文摘要	Ultrasonic vibration cavitation erosion experiments were performed to study the erosion on a steel specimen at different pitch angles. Experimental results show that the number and size of the erosion pits decrease as the pitch angle increases. This result is thought to be related to the hydrodynamic pressures generated near the solid surface. Numerical analyses from the Reynolds equation prove that the hydrodynamic pressures are generated in the fluid film when a bubble is moving towards the surface of the specimen. Simulation of the bubble collapse process shows that the hydrodynamic pressures shorten the collapse time of a bubble and strengthen the microjet at the moment of bubble collapse. As the pitch angle of the specimen surface increases, the squeeze pressure due to normal velocity decreases, and the increased dynamic pressure due to tangential velocity cannot compensate for the loss of the squeeze pressure. Thus, the total hydrodynamic pressure decreases, and a decrement in the number and the size of the erosion pits occurs.
语种	英语
出版者	Published for the Institution of Mechanical Engineers by Professional Engineering Publishing Ltd. ; UK
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80362]
专题	清华大学
推荐引用方式 GB/T 7714	Chen, S.,Wang, J.D.,Li, Y.J.,et al. Effect of hydrodynamic pressures near solid surfaces in the incubation stage of cavitation erosion[J],2010, 2010.
APA	Chen, S.,Wang, J.D.,Li, Y.J.,&Chen, D.R..(2010).Effect of hydrodynamic pressures near solid surfaces in the incubation stage of cavitation erosion..
MLA	Chen, S.,et al."Effect of hydrodynamic pressures near solid surfaces in the incubation stage of cavitation erosion".(2010).

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