Effects of surface tension on bubble growth in an extensive uniformly superheated liquid

Abstract

The study of bubble growth in an extensive pool of liquid provides considerable insight into the mechanisms that play a role in bubble growth near a heated surface and in the cavitation phenomenon. This work focuses on analyzing the effects of surface tension on the growth rate for the thermally controlled stage of a single bubble in such a liquid. The conservation of energy equations, including the internal energy term for the bubble and that within boundary layer around it, are numerically solved. The complete temporal variations of the bubble in water and liquid nitrogen are investigated based on the assumption that the bubble growth is controlled only in sequence by inertia and heat. Thus, the two stages are subject to the continuity of the bubble growth, while the inertia-controlled stage is only formulated by the well-known Rayleigh solution. The thickness of the boundary layer around the bubble is also determined. The results are comparable with the Plesset-Zwick models and Forster-Zuber models, as well as available experimental data. It is found that the influence of internal energy on the rate of bubble growth is small enough to be ignored; however, the accumulative effects of the surface tension are significant and increase with a decrease in the degree of superheat.

Selective laser melting 3D printing of Ni-based superalloy: understanding thermodynamic mechanisms

“…8d), respectively, and the resultant densification was reduced sharply to 89.3 % (Fig. 9d), caused by the lower surface tension of melt flow in this instance [45].…”

Intensive evaporation and boiling of a heterogeneous liquid droplet with an explosive disintegration in high-temperature gas area

“…This effect will allow increasing the evaporation area of liquid composition within the actual fire situation zone in several times. At first the insufficient study of this effect can be explained, as a rule, by difficult [11,12] processes of the formation and growth of bubbles at internal interfaces, high speeds of processes at intensive heat exchange -especially at the typical (more than 600 K) temperatures of fires, possible vaporization at external surface and internal interfaces. Currently, there are not any even simplified models to predict the conditions of an explosive vaporization of heterogeneous droplets.…”

Numerical study of surface tension effects on bubble detachment in a submerged needle

“…For the case of CFD simulation methods for multi-phase flows, Eulerian-Eulerian (E-E), Eulerian-Lagrangian (E-L) and direct numerical simulation (DNS) methods have been employed (Delnoij et al [1], Krishna and van Baten [2], Yang et al [3], Das et al [4], Di Bari and Robinson [5]). One of the most important parameters in formation and dynamics of bubbles is surface tension, especially in boiling process (Weinberg [6], Loubière and Hébrard [7], Zhang et al [8]).…”