Bubble growth models in saturated pool boiling of water on a smooth metallic surface: Assessment and a new recommendation

A Review of Pool-Boiling Processes Based on Bubble-Dynamics Parameters

“…The measurements were conducted using a high-speed, highresolution camera, and the complete cycle of bubbles from nucleation, growth, detachment to nucleation again is shown in Figure 10. They also evaluated existing uniform and non-uniform bubble growth models based on experimental data [66]. They found that the existing models are difficult to unify after summarizing these studies, most of which are only applicable under the experimental conditions employed by the proposers themselves, and suggested that the phenomenon may be caused by the excessive differences in the mechanisms affecting bubble kinetics (bubble growth rate, bubble detachment diameter, bubble growth period, etc.…”

“…The homogeneous nucleation of bubbles was categorized into three distinct phases by Mahmoud [66]: surface tension growth, inertial growth, and thermal diffusion growth, as shown in Figure 11.…”

“…The homogeneous nucleation of bubbles was categorized into three distinct phases by Mahmoud [66]: surface tension growth, inertial growth, and thermal diffusion growth, as shown in Figure 11. In the surface tension growth phase, the initial equilibrium radius of the bubble is R0, which is obtained from the pressure difference between inside and outside the bubble, and the surface tension equilibrium is pv − pl∞ = 2σ/R, i.e., the Young-Laplace equation.…”

“…Although the above differential equation does not have an analytical solution, each of the individual growth stages in it has an approximate solution or a numerical solution. Rayleigh [66] neglected the surface tension phase as well as the vapor-liquid density ratio (ρ v /ρ l ), and assumes that the bubble grows isothermally to obtain a Rayleigh solution (Equation ( 18)) to inertia-controlled growth, which shows that radius is proportional to time.…”

“…In Figure 12d, the growth of the bubble comes from the combined effect of the micro-fluid layer and the thermal boundary layer around the bubble. Mahmoud et al [66] concluded that models based only on micro-fluid layer evaporation are insufficient to explain bubble growth, and can only reach good agreement with the results under certain specific experimental conditions after a detailed evaluation of several mathematical models of the micro-fluid layer. Bubble growth is mainly promoted by evaporation from the thermal boundary layer around the bubble, and the effect of the micro-liquid layer is relatively small for some fluids such as water.…”