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根据反射光谱可用于分析固体表面介质凝聚状态的原理,理论分析了不锈钢表面上不同厚度薄液膜对表面反射率的影响,确定了在冷凝过程中该表面上冷凝液形成和更新过程导致相应反射率变化的范围.通过分析滴状冷凝实验过程反射光谱的文献数据,研究了滴状冷凝过程壁面上蒸气分子凝聚特征,发现在实际的滴状冷凝传热过程中,液滴脱落后形成的裸露表面上存在反射特征介于液膜与体相蒸气分子之间的介质.结合蒸气冷凝过程的分子团聚模型,得到了在滴状冷凝过程中近壁面附近的蒸气分子形成分子团聚分布的合理性.此外,分析发现表面微观结构将改变团聚体分布密度,从而影响冷凝核化过程的现象.这为冷凝传热强化方法的研究提出了新的思路.
According to the principle that the reflection spectrum can be used to analyze the cohesive state of the solid surface media, the influence of thin film with different thickness on the surface reflectivity of stainless steel was theoretically analyzed, and the formation and renewal process of condensate on the surface of the stainless steel caused the corresponding reflections Through analyzing the literature data of the reflection spectra of drop condensation experiments, the condensation characteristics of vapor molecules on the wall of droplet condensation process were studied. It was found that the droplet formed during the actual droplet condensation heat transfer There is a reflection medium on the surface between the liquid film and the vapor phase of the vapor phase.With the molecular agglomeration model of the vapor condensation process, the reasonableness of molecular agglomeration distribution of the vapor molecules in the vicinity of the wall near the wall is obtained. In addition, it is found that the microstructure of the surface will change the distribution density of aggregates and thus affect the phenomenon of nucleation process, which brings forward a new idea for the study of condensation heat transfer enhancement.