关键词: 冰晶结冰, 非球形, 形状演化, 融化模型, 多相传热

Abstract: This study investigates the melting characteristics and shape evolution of non-spherical ice crystals in hot airflow environment. A melting model for non-spherical ice crystals was developed based on a decoupling strategy for flow and phase-change heat transfer, enabling a solution to the complex heat transfer problem involving gas-liquid-solid coupling. The results demonstrate that the proposed model accurately predicts the shape evolution process during ice crystal melting, and the predicted melting times agrees well with experimental results, with a deviation of ±15%. The shape evolution of non-spherical ice crystals undergoes three distinct stages: an initial warming stage where the shape remains stable, a partial water coverage stage where liquid water partially covers the ice core surface, and a complete water coverage stage where the ice core is fully enveloped. The initial aspect ratio is identified as the key factor governing the shape evolution during melting. A larger initial aspect ratio results in a longer time re-quired for the ice crystal to evolve into a spherical shape. Furthermore, an empirical correlation between dimen-sionless sphericity and the melting ratio was established, overcoming the limitations of the traditional linear approx-imation model for high-aspect-ratio ice crystals (aspect ratio λ > 2) and significantly improving computational accu-racy.

Key words: ice crystal icing, non-spherical, shape evolution, melting model, multiphase heat transfer