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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Effect of Substrate Wettability on Frost Properties
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Effect of Substrate Wettability on Frost Properties

机译：基材润湿性对结霜性能的影响

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摘要

Microscopic observations of frost deposition on clean glass (hydrophilic) and polytetrafluoroethylene (PTFE) (hydrophobic) substrates allow the quantification of frost growth and characterization of structure. In contrast to early growth behavior, the thickness of the frost layer during the mature growth increases faster on substrates that have lower contact angles, and the frost density is less than that measured for high-contact angle substrates. This behavior is explained in terms of the effects of substrate wettability and its impact on condensate distribution, the initial condition for frost growth. A higher conductivity layer is formed on the hydrophilic than on the hydrophobic substrate. Modeling that is based on a relation between thermal conductivity and frost structure is used to predict the growth rate and density on the two different substrates. These predictions agree with the experimental data and support the explanation that substrate wettability affects mature frost growth through its effect on condensate distribution at frosting incipience.
机译：在干净的玻璃（亲水性）和聚四氟乙烯（PTFE）（疏水性）基材上的霜沉积物的显微镜观察可以量化霜的生长和结构特征。与早期生长行为相反，在成熟生长过程中，霜层的厚度在具有较低接触角的基材上增长更快，并且霜密度小于对高接触角基材测得的霜密度。用基质润湿性的影响及其对凝结水分布的影响（霜冻生长的初始条件）来解释这种现象。在亲水性上形成比在疏水性基底上形成更高电导率的层。基于热导率和霜结构之间关系的建模用于预测两种不同基材上的生长速率和密度。这些预测与实验数据一致，并支持以下解释：基质的可湿性通过其在结霜初期对冷凝物分布的影响而影响成熟的霜冻生长。

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