The surface instability observed during the growth phase of a laser-induced bubble in agarose gels was examined utilizing the stability analysis method introduced by Yang et al. (2021). The agarose gel was modeled as the qKV model for viscoelastic fluids. Initially, the shear modulus G and the viscosity μ of the gel were determined by comparing the temporal evolution of bubble radii between experimental measurements and simulations based on the Rayleigh-Plesset equation for viscoelastic fluids. Utilizing G, μ, alongside experimentally obtained data on bubble radius, velocity, and acceleration, two types of instability parameters were computed for each surface oscillation mode, expanded using spherical harmonics. The analysis successfully predicted the instability of low-degree surface oscillation modes but was less accurate for high-degree modes. Additionally, the findings indicated that increasing shear modulus and viscosity tended to stabilize surface oscillation modes, with this effect being particularly significant for high-degree modes.
OHSHIMA et al. (Sun,) studied this question.