Bubble characteristics on surface boiling: experiments and implementation of numerical models
Boiling heat transfer under highly unsteady thermal conditions is critical for many advanced energy systems, yet the predictive capability of existing models remains limited due to a lack of experimental data under rapid heating. This work presents new experimental data on nucleate boiling of subcooled water at surface temperature rise rates from 500 to 20,000 K/s, initial liquid temperatures from 30 to 110 °C, mass flow rate 0.1 kg/s, and an absolute pressure of 0.29 MPa. A total of 97,091 high-speed video frames were processed, yielding 917,198 individual bubbles with their characteristics. The RPI model of near-wall heat transfer was used for numerical simulation of unsteady heat transfer at nucleate boiling. The results demonstrate that while the incipience of boiling under dynamic conditions can be described by classical steady-state correlations, the subsequent bubble dynamics are governed by the transient thermal state of the superheated layer and correlate strongly with the Fo number, necessitating dynamic models for accurate prediction of heat transfer. The study conclusively demonstrates that the missing element in current models is the dynamic evolution of the superheated layer thickness, which must be determined numerically. © 2026 Elsevier Ltd.
Библиографическая ссылка
Levin A.A., Khan P.V., Safarov A.S., Chernov A.A.¶ Bubble characteristics on surface boiling: experiments and implementation of numerical models // Applied Thermal Engineering. Vol.301. No.131610. 2026. DOI: 10.1016/j.applthermaleng.2026.131610
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