The effect of turbulence on the dynamics of two bubbles in hydrodynamic cavitation

29th IAHR Symposium on Hydraulic Machinery and Systems

Lv, Liang^1^2 ; Zhang, Yongxue^1^2 ; Zhang, Yuning^1^2

College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing

102249, China^1

Beijing Key Laboratory of Process Fluid Filtration and Separation, China University of Petroleum-Beijing, Beijing

102249, China^2

关键词: Fluctuation frequency;    Hydrodynamic cavitations;    Inhibition effect;    Intensity of turbulences;    Internal temperature;    Maximum temperature;    Numerical results;    Oscillation behavior;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062042/pdf
DOI  :  10.1088/1755-1315/240/6/062042

来源: IOP

【 摘 要 】

Hydrodynamic cavitation is commonly found in hydraulic machineries, causing damages to equipment, reducing efficiency and making noise, which has been researched intensely in past years. In these processes, cavitation bubbles play essential roles, and their behaviors and interactions influence the effects of cavitation significantly. In this paper, the effect of turbulence on the dynamics of two bubbles generated by an orifice plate is studied. The oscillation of the two bubbles and the internal maximum temperature of the two bubbles during collapse under the influence of turbulence are investigated numerically. The numerical results show that the existence of the larger bubble exert restrained impact on the oscillation behavior of the smaller bubble. When the distance between the two bubbles decreases, the inhibition effect grows stronger. The maximum internal temperature of the smaller bubble rises violently, while the maximum internal temperature of the larger bubble is affected little. The influences of two parameters (i.e., cavitation number, aperture ratio) on the fluctuation frequency and intensity of turbulence affecting bubble behaviors are also investigated.