Research of Cavitation at High Shear Stress

Journal of Mechanical Engineering

Fuszko Zoltán¹  Csuka Zoltán¹  Olšiak Róbert¹ 

[1] Slovak University of Technology in Bratislava, Faculty of Mechanical Engineering, Institute of Chemical and Hydraulic Machines and Equipment, Nám. slobody 17, 812 31 Bratislava;

关键词: shear stress;    cavitation;    rotating cylinder;    pressure drop;    narrow gap;    turbulence;   

DOI  :  10.1515/scjme-2016-0006

来源: DOAJ

【 摘 要 】

The article describes the theory of cavitation at high values of shear stress in a viscous liquid. For this purpose, a spatial model of two cylindrical shells imposed concentrically was designed. In the narrow gap between the cylinders the temperature, density and viscosity of liquid is constant. Shear stress is induced by the rotary motion of the inner cylinder, resulting in a change of velocity and pressure fields. Due to the pressure drop between the cylinders there is a precondition to the formation of cavitation bubbles at the point of the lowest static pressure. To verify the assumption was made CFD model based on simplified physical model, through which cavitation was qualitatively and quantitatively assessed. In this paper the results of the numerical solution will be presented alongside with basic form of experimental device for physical generation of cavitation at high values of shear stress.

【 授权许可】

Unknown