We use high-speed imaging to observe the dynamics of cavitation, caused by the impact and subsequent rebound of a sphere from a solid surface covered with a thin layer of highly viscous liquid. We note marked qualitative differences between the cavitation structures with increase in viscosity, as well as between Newtonian and non-Newtonian liquids. The patterns observed are quite unexpected and intricate, appearing in concentric ring formations around the site of impact. In all cases, we identify a distinct radius from which the primary bubbles emanate. This radius is modelled with a modified form of Hertz contact theory. Within this radius, we show that some fine cavitation structure may exist or that it may be one large cavitation bubble. For the non-Newtonian fluids, we observe foam-like structures extending radially with diminishing bubble sizes with increase in radial position. Whereas for the Newtonian fluids, the opposite trend is observed with increasing bubble size for increasing radial position. Finally, we compare our experimental observations of cavitation to the maximum tension criterion proposed by Joseph (J Fluid Mech 366:367–378, 1998) showing that this provides the lower limit for the onset of cavitation in our experiments.
Cavitation Impact Velocity Liquid Bridge High Impact Velocity Minimum Separation
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in to check access.
This work was initiated while W. Yong was attached to ICES from NUS during an undergraduate industrial attachment scheme under J.O. Marston. The work was supported by the Science and Engineering Research Council of A*STAR (Agency for Science, Technology and Research), Singapore. The authors would like to thank Ng Junwei for technical support and Professors T.G. Etoh & K. Takehara at Kinki University for use of their laboratory for some early experiments in this work.
Ardekani AM, Joseph DD, Dunn-Rankin D, Rangel RH (2009) Particle-wall collision in a viscoelastic fluid. J Fluid Mech 633:475–483zbMATHCrossRefGoogle Scholar
Ashmore J, Del Pino C, Mullin T (2005) Cavitation in a lubrication flow between a moving sphere and a boundary. Phys Rev Lett 94:124501CrossRefGoogle Scholar
Barnocky G, Davis RH (1988) Elastohydrodynamic collision and rebound of spheres—experimental verification. Phys Fluids 31:1324–1329CrossRefGoogle Scholar
Davis RH, Serayssol J-M, Hinch EJ (1986) The elastohydrodynamic collision of two spheres. J Fluid Mech 163:479–497CrossRefGoogle Scholar
Davis RH, Rager DA, Good BT (2002) Elastohydrodynamic rebound of spheres from coated surfaces. J Fluid Mech 468:107–119zbMATHCrossRefGoogle Scholar
Donahue CM, Hrenya CM, Davis RH, Nakagawa KJ, Zelinskaya AP, Joseph GG (2010) Stokes’ cradle: normal three-body collisions between wetted particles. J Fluid Mech 650:479–504zbMATHCrossRefGoogle Scholar
Lian G, Xu Y, Huang W, Adams MJ (2001) On the squuze flow of a power-law fluid between rigid spheres. J Non-Newt Fluid Mech 100:151–164zbMATHCrossRefGoogle Scholar
Marston JO, Yong W, Thoroddsen ST (2010) Direct verification of the lubrication force on a sphere travelling through a viscous film upon approach to a solid wall. J Fluid Mech 655:515–526zbMATHCrossRefGoogle Scholar
Prokunin AN, Slavin RV (2006) Cavitation-induced particle-wall interactions in Newtonian and non-Newtonian fluids. Rheol Acta 45:348CrossRefGoogle Scholar