From nucleation to cloud cavitation

29th IAHR Symposium on Hydraulic Machinery and Systems

Pelz, P.F.^1 ; Buttenbender, J.^1 ; Keil, T.^1 ; Gross, T.F.^1 ; Terwort, A.^1

Technische Universität Darmstadt, Department of Fluid Systems, Otto-Berndt-Strasse 2, Darmstadt

64287, Germany^1

关键词: Cloud cavitations;    Critical length;    Micro-bubble;    Nucleation rate;    Sheet lengths;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062037/pdf
DOI  :  10.1088/1755-1315/240/6/062037

来源: IOP

【 摘 要 】

This paper shows the dependency of cavitation nuclei and the resulting cavitation, illustrating the lifetime of a bubble from its birth to death. Micro bubbles which are periodically detaching from surface nuclei contribute to the formation of a sheet. After reaching a critical length, which depends on the nucleation rate, the sheet is peeled of by a viscous spreading film. The detached sheet forms a cloud in the shape of a horseshoe with a circulation depending on the sheet length and, consequently, the nucleation rate. Finally, the cloud collapses with an intensity depending on the circulation.