Shock wave emission from laser-induced cavitation bubbles in polymer solutions

Time-resolved dynamics of laser-induced micro-jets from thin liquid films

“…Their internal propagation appears to be inhibited by shear stresses from the more dominant downward flow into the main jet (Yu et al 1995). This is consistent with similar observations that the velocity of a re-entrant jet can be reduced or even entirely suppressed by viscous forces (Chahine and Fruman 1979;Brujan et al 1996;Popinet and Zaleski 2002;Liu et al 2009;Minsier et al 2009). …”

Spherical bubble collapse in viscoelastic fluids

“…The evolution of in time can be determined using (12). Subsequently, the integral equation (2) can be solved to determine ∂ /∂n and hence the velocity field.…”

“…The equation of motion with the inclusion of the material Maxwell model is given by (12) with = 0, where T nn is found from the constitutive equation…”

Cavitation-Enhanced Mechanical Effects and Applications

“…Before collapsing adiabatically, a bubble expands to a maximum radius and then at the final stage of a symmetric collapse, the bubble content is compressed into a very small volume. Thus, the bubble rebounds due to the compressed interior gas and leads to the emission of a very high-pressure transient into the surrounding liquid that can evolve into a shock wave (Vogel et al 1989;Brujan 2008;Ohl et al 1999). A single spherical cavitation bubble can be easily produced by a focused laser, and these bubbles have been used to study the dynamics of bubble collapse.…”

“…As non-Newtonian fluids are more prevalent in biomedicine and bioengineering application, in his book Brujan (2011) systemically discussed cavitation and bubble dynamics in non-Newtonian fluids from the standpoint of non-Newtonian fluid mechanics, physics, chemical engineering, and biomedical engineering. Figure 5.21 shows a series of high-speed photographic records of bubble motion in water, a 0.5 % carboxymethylcellulose (CMC) solution with a weak elastic component, and a 0.5 % polyacrylamide (PAM) solution with a strong elastic component for the case where γ = 3.17 (Brujan et al 1996). The liquid jet, which developed on the upper side of the bubble leading to the protrusion of the lower bubble wall, can be seen in the case of bubbles situated in water (top sequence).…”