In the case of setting the mass ratio of HMSPP to PP at 7 ∶93, the density of the foam article reached 0.12 g/cm3 and, the article featured uniform dimension of bubble, thin bubble wall and trim appearance.

In this paper the Gilmore's equation for the fluid compressibility is employedas the mathematical model for bubble wall motion,and Gill's method is also used tocompile the programs to solve initial value problems of nonlinear differential equations.

We have derived a dynamical equation of shape instability for a spherical bubble,where water vapor evaporation and condensation at a sonoluminescencing bubble wall are considered.

Numerical simulation shows that a negative pressure region appears in the vicinity of the bubble wall for those bubbles with a larger maximum radius, when the bubble is in its compressed phase, and which makes the bubble in the position of unstable equilibrium.

A correlation to predict the critical bubble collapse is proposed under the condition of the zero initial bubble wall moving velocity and compared with the results in the existing references.

The size of the bubble is determined by a balance between the zero-point energy of the electron, the surface energy of the bubble wall, and the polarization energy of the helium in the electric field of the electron.

We show that if the electron is optically excited from the 1s to the 1p state, the bubble wall will be set into motion, and that the inertia of the liquid surrounding the bubble can be sufficient to lead to the break-up of the bubble into two pieces.

Numerical analysis is performed of the bubble dynamics and acoustic losses (the profile and amplitude of the radiation wave generated on the bubble wall from the side of the liquid).

It is shown that small (:about 1%) additives of an incondensable gas lead to a considerable decrease in mass transfer on the bubble wall.

It is found that at the stage of collapse, intense condensation occurs on the bubble wall, which results in a significant (more than 15‐fold) decrease in bubble mass and an increase in pressure (to 105 atm) and temperature (to 104 K(.

The formation of hard bubbles by single-pulse bias field in epitaxial garnet films was investigated in some detail. It was verified by experiments and calculations that, in general, VBL in hard bubble walls are not generated by the way that one Bloch line pair is produced per pulse. The dependence of the hardening of soft domain segments on their movements was revealed by means of the method of double exposure photography. Two kinds of favorite movements for hard bubble formation were discovered...

The formation of hard bubbles by single-pulse bias field in epitaxial garnet films was investigated in some detail. It was verified by experiments and calculations that, in general, VBL in hard bubble walls are not generated by the way that one Bloch line pair is produced per pulse. The dependence of the hardening of soft domain segments on their movements was revealed by means of the method of double exposure photography. Two kinds of favorite movements for hard bubble formation were discovered and the physical meaning of the" demarcation field for soft and hard bubble formation" H_[b] was elucidated.

High-speed photography is an effective tool for the study of cavitation phenomenon. The effects of fluid viscosity,sediment concentration and fluid velocity on bubble collapse process as generated by electronic sparks was investigated. Main conclusions are:the viscosity of fluid tends to slow down and then prolong the process of collapse and growth ; effect of sediment concentration on bubble collapse and growth is similar to that of fluid viscosity; the fluid velocity tends to slow down the process of bubble...

High-speed photography is an effective tool for the study of cavitation phenomenon. The effects of fluid viscosity,sediment concentration and fluid velocity on bubble collapse process as generated by electronic sparks was investigated. Main conclusions are:the viscosity of fluid tends to slow down and then prolong the process of collapse and growth ; effect of sediment concentration on bubble collapse and growth is similar to that of fluid viscosity; the fluid velocity tends to slow down the process of bubble growth but speed up the process of collapse ; the high-velocity microjet is directed to the wall when the bubble collapses near the wall ; but in the case of a highly resilient wall or free surface, the direction of high-velocity microjet will move away from the wall or the free surface; in the process of bubble collapse, the bubble wall motion would induce the motion of sediments around the bubble. Representative high-speed photogrophs are given

Employing the Rayleigh's method, the collapse of a vaporous bubble in an incompressible liquid with surface tension is analysed. The expressions of time versus radius, bubble-wall velocity and pressure developed at collapse are thus introduced.