This study modified a model based on the Euler-Euler model to describe the frosting performances of the AAV (Air Ambient Vaporizer) heat transfer process in the LNG (Liquefied Natural Gas) industry at ultra-low temperatures. The moisture and temperature contours were presented to illustrate the impacts of moisture and temperature fields on the frosting performances. The performances including the frost layer thickness, ice volume fraction, and thermal conductivity coefficient as affected by the fin number of AAV were compared and analyzed. Results showed that the fin number of 8 had the highest frost layer thickness (average of 3.44 mm at the frosting time of 300 s) and frost growth rate (average of 0.69 mm/min), whereas the fin number of 6 had the lowest frost layer thickness (average of 1.46 mm at the frosting time of 300 s) and frost growth rate (average of 0.29 mm/min). The average ice volume fraction was the highest (4.03 × 10) for the fin number of 8 and was the lowest (2.14 × 10) for the fin number of 6. The maximum thermal conductivity coefficient for the fin number of 8 increased from 0.15 W/(m·K) to 0.26 W/(m·K) with an average growth rate of 0.027 W/(m·K·min) when the frosting time changed from 50 s to 300 s. The study can provide a guide for the design and application of the AAV.

中文翻译：

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不同翅片数的LNG环境空气汽化器结霜性能

本研究在Euler-Euler模型的基础上修改了模型，以描述超低温下LNG（液化天然气）行业AAV（空气环境汽化器）传热过程的结霜性能。给出了湿度和温度等值线，以说明湿度和温度场对结霜性能的影响。比较分析了AAV翅片数对霜层厚度、冰体积分数、导热系数等性能的影响。结果表明，翅片数为8时，霜层厚度最高（结霜时间300 s时，平均为3.44 mm），霜生长速率最高（平均为0.69 mm/min），翅片数为6时，霜层厚度最低（平均为0.69 mm/min）。层厚度（结霜时间为 300 秒时平均为 1.46 毫米）和霜生长速率（平均为 0.29 毫米/分钟）。翅片数为8时平均冰体积分数最高(4.03×10)，翅片数为6时平均冰体积分数最低(2.14×10)。翅片数为8时最大导热系数从0.15W增加当结霜时间从50 s变为300 s时，/(m·K)增加到0.26 W/(m·K)，平均增长率为0.027 W/(m·K·min)。该研究可为AAV的设计和应用提供指导。