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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermodynamic analysis of near-wall effects on phase stability and homogeneous nucleation during rapid surface heating
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Thermodynamic analysis of near-wall effects on phase stability and homogeneous nucleation during rapid surface heating

机译：快速加热过程中近壁对相稳定性和均相成核作用的热力学分析

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Rapid heating of a liquid by a thin film heater surface may initiate homogeneous nucleation of vapor in the liquid in contact with the surface. In such circumstances, nucleation is generally expected to be most likely in the hottest liquid closest to the surface. It is known, however, that in many cases the liquid molecules closest to the surface will experience long-range attractive forces to molecules in the solid, with the result that the equation of state for the liquid near the surface will differ from that for the bulk liquid. In the investigation summarized here, a statistical thermodynamics analysis was used to derive a modified version of the Redlich-Kwong fluid property model that accounts for attractive forces between the solid surface molecules and liquid molecules in the near-wall region. In this model, the wall-fluid attractive forces are quantified in terms of Hamaker constants. This feature makes it possible to assess the effect of wall-fluid force interactions on the spinodal conditions for a variety of fluid and surface material combinations. The variation of pressure near the wall predicted by this model agrees well with the predictions of a hydrostatic model and molecular dynamics simulations. The results of the thermodynamic model analysis indicate that force interactions are important for a wide variety of fluids only within a few nanometers of the solid surface. The model specifically predicts that these forces increase the spinodal temperature in the near-surface region. The implications of this increase for nucleation near a solid surface during rapid heating are explored for circumstances similar to those in inkjet printer heads. The results of the analysis imply that during rapid transient heating, wall effects can result in homogeneous nucleation occurring first at a location slightly away from the solid surface. The results further suggest that on rough surfaces, wall effects may play a role in making some cavities preferred sites for homogeneous nucleation.
机译：通过薄膜加热器表面对液体的快速加热可引发与表面接触的液体中蒸汽的均匀成核。在这种情况下，通常最可能在最靠近表面的最热液体中发生成核。但是，众所周知，在许多情况下，最靠近表面的液体分子将对固体分子产生长距离的吸引力，其结果是，靠近表面的液体的状态方程将不同于表面的液体的状态方程。散装液体。在这里总结的研究中，使用统计热力学分析来得出Redlich-Kwong流体性质模型的修改版本，该模型考虑了近壁区域中固体表面分子和液体分子之间的吸引力。在此模型中，根据Hamaker常数对壁流体吸引力进行了量化。此功能使得可以评估各种流体和表面材料组合中壁力相互作用对旋节线条件的影响。该模型预测的壁面附近压力变化与流体静力学模型的预测和分子动力学模拟非常吻合。热力学模型分析的结果表明，力相互作用仅对于固体表面几纳米范围内的多种流体都非常重要。该模型专门预测这些力会增加近地表区域中的旋节线温度。在类似于喷墨打印机头的情况下，探索了这种增加对于快速加热期间固体表面附近成核的影响。分析结果表明，在快速瞬态加热期间，壁效应会导致均匀成核首先发生在稍微远离固体表面的位置。结果进一步表明，在粗糙表面上，壁效应可能在使某些型腔成为均匀成核的首选​​位置方面起作用。

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