[en] The concept of the critical nucleus is the basis of the homogeneous nucleation theory which enables the upper limit of a superheat to be calculated. Only nucleus formation is considered. It is as if nuclei that reach the critical dimensions are removed from the system and replaced by an appropriate mass of liquid. The theory does not give any information concerning the dynamics of bubble growth either. Nevertheless, some researchers use the concept of the critical nucleus as the initial condition in a descritpion of the bubble growth in superheated liquid. A bubble begins to grow after the disturbance of the balance, when the pressure difference exceeds the surface tension. According to this scheme, the initial bubble growth results from the fact that the vapor pressure in the bubble is higher than that in the surrounding liquid

[en] Filming technology at 5,000 frames/second is presented in this paper for the determination of the volume and the expension speed of a gas bubble in water. The high speed 16 mm movie camera, fitted with ultra-wide angle lenses, is placed in front of a side light facing the bubble. Ten 60 ms fast flashes, released in succession, illuminate the bubble

[en] Highlights: •A theoretical correlation for the bubble lift-off diameter on a horizontal tube. •Growth and lift-off phenomena of bubbles generated on a horizontal tube. •Bubble lift-off diameter depends on the azimuthal position of the horizontal tube. -- Abstract: In this study, experiments and a theoretical analysis on the lift-off diameter of bubbles generated on a horizontal tube were conducted. A force balance analysis in the direction normal to the heated surface at the moment of the bubble lift-off was performed to develop the model. According to the developed model, the bubble lift-off diameter strongly depends on the azimuthal position of the horizontal tube, the relative velocity between a bubble and the surrounding liquid, and the properties of the bubble and liquid. To validate the prediction performance of the proposed model, the dynamics of the bubble growth and sliding process was visualized using a high-speed digital video camera. The proposed model agrees well with the experimental data within an averaged relative deviation of 19.6%.

[en] The paper reviews a problem of vapor particle propagation velocities in a bubble under its radial compression. This problem is of interest due to a necessity of correct assignment of a convective member of the equation of thermal conductivity in the vapor phase, when studying interphase heat and mass transfers in bubble media

[en] In this investigation an anlytical solution is derived for a bubble growth equation originally obtained by Plesset and Zwick (1954) for a conduction-controlled growth. For a long time only approximate solutions to this equation were presented by solving for the bubble as though it was of plane shape with a correction factor to compensate for sphericity (author)

[en] Bubble evolution in liquid under the diffusion effect is investigated. A linear stage in which emergence of bubble oscillations is shown has been studied. A nonlinear growth and collapse stage is analysed in the case of domination of diffusion processes

[en] The bubble growth rate and microlayer behavior were simultaneously visualized for an isolated boiling regime of saturated water. The increase rate of the bubble volume dropped sharply when the microlayer was totally depleted. However, the contribution of the superheated liquid layer evaporation to the bubble volume increase was comparable to or even higher than that of the microlayer evaporation during the time when the microlayer evaporation was active. The microlayer under the coalesced bubble was much thicker than that under single isolated bubble. (author)

No abstract available

[en] The nature of vapour bubble shape stability is calculated on the basis of application of pressure distribution obtained around the vapour bubble growing in a boiling liquid. Stability regions of the vapour bubble shape, determined by a bubble size and by the values of dynamic characteristics of bubble growth, have been found

[en] Weakly Interacting Massive Particles (WIMPs) are one of the most promising cold dark matter (CDM) candidates. Direct detection experiments for dark matter (DM) search look for signatures of nuclear recoils produced due to WIMP-nucleus elastic scattering. In the present study, attempts are made to understand the scintillation characteristics of nuclear recoil events in scintillation crystals for possible application in DM search experiments. The nature of the recoil energy distribution of neutron-induced recoiling Cs/I nuclei is studied using the GEANT4.10.02 simulation toolkit and the behaviour of the quenching factor of the Cs/I nuclei in CsI crystal as a function of the recoiling nucleus energy is studied using the SRIM software