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首页> 外文期刊>International Journal of Heat and Mass Transfer >The effect of natural convection in a liquid layer and the thermal inhomogeneity of vapor on the stability of a vapor film on a flat horizontal heater
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The effect of natural convection in a liquid layer and the thermal inhomogeneity of vapor on the stability of a vapor film on a flat horizontal heater

机译：液体层中的自然对流和蒸气的热不均匀性对水平卧式加热器上蒸气膜的稳定性的影响

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摘要

The linear stability of a vapor film, formed on the surface of a flat horizontal heater in a subcooled film boiling regime under conditions of terrestrial gravity, is studied. The study is aimed to estimate the role of natural convection in a liquid cooled from above, which is influenced by an additional flow caused by the redistribution of matter in the phases, in the process of stabilization of a stationary base state with a balanced heat flux at the interface between the two media. A modification of the conventionally used model of convective heat transfer (Newton-Rikhman's law) is proposed. The calibration of the presented model, which is characterized by a dependence of the local coefficient of convective heat transfer on the rate of phase transition, is carried out on the basis of the experimental data available in the literature. The modified model allows to avoid the underestimation of the critical value of the heat flux in the subcooled liquid, at which a complete suppression of the Rayleigh-Taylor instability by a phase transition is achieved. In addition, it is demonstrated that the inhomogeneity of thermophysical properties of vapor and heat transfer by radiation at the boundaries of the vapor layer exert, respectively, stabilizing and destabilizing effects under the condition of a significant overheating of the heater surface.
机译：研究了在地面重力条件下在过冷膜沸腾状态下在水平卧式加热器表面上形成的蒸气膜的线性稳定性。该研究旨在评估自然对流在从上方冷却的液体中的作用，该自然对流在平衡热通量稳定稳态基态的过程中受相中物质再分布引起的附加流动的影响在两种媒体之间的界面上。提出了对流传热模型（牛顿-里克曼定律）的一种改进。根据现有的实验数据，对所提出的模型进行校准，其特征在于对流传热的局部系数与相变速率之间的关系。修改后的模型可以避免过低估计过冷液体中热通量的临界值，在该处可以通过相变完全抑制瑞利-泰勒不稳定性。此外，已经证明，在加热器表面明显过热的情况下，蒸汽的热物理性质的不均匀性和通过辐射在蒸汽层的边界处的传热分别发挥稳定和去稳定的作用。

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