We present an original model describing the transient flow boiling crisis of water at high subcooling and atmospheric pressure. We hypothesize that in such conditions, the mechanism of the boiling crisis is the prevention of the bubbles recondensation when a thin fluid layer near the heated wall reaches temperature saturation conditions. To capture this phenomenon, we propose an energy model describing the heat exchanges in the thin fluid layer throughout the entire transient from the initiation to the boiling crisis. We bring to light a non-dimensional mathematical relation capturing 168 working points in the investigated range of power escalation period (from 5 to 500 ms), subcooling (from 25 to 75 K) and Reynolds number (8,500 to 35,000) at atmospheric pressure. Its fitting accuracy is excellent for the high subcooling (50 K and above): more than 75 % of these points are predicted with $\pm$ 5 % error. This relationship enables the prediction of the transient critical heat flux based on the steady-state value or a single tuning constant. The non-dimensional groups deduced from the study are relevant tools to identify the major physical phenomena involved in transient boiling crisis and to quantify the impact of the different operating parameters.

我们提出了一个原始模型，描述了在过冷和大气压下水的瞬态流动沸腾危机。我们假设在这样的条件下，沸腾危机的机理是当加热壁附近的薄流体层达到温度饱和条件时，防止气泡再凝结。为了捕获这种现象，我们提出了一个能量模型，该模型描述了从引发到沸腾危机的整个瞬变过程中，薄流体层中的热交换。我们揭示了一个无量纲的数学关系，该关系捕获了在大气压下的功率提升周期（从5到500 ms），过冷（从25到75 K）和雷诺数（从8500到35,000）的研究范围内的168个工作点。高过冷度（50 K及以上）的装配精度非常出色：$\pm$5％的错误。这种关系使得能够基于稳态值或单个调整常数来预测瞬态临界热通量。从研究中得出的无量纲组是相关工具，可用于识别与瞬时沸腾危机有关的主要物理现象，并量化不同操作参数的影响。