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首页> 外文期刊>Journal of Thermal Science and Engineering Applications: Transactions of the ASME >Numerical Simulation of Frosting on Fin-and-Tube Heat Exchanger Surfaces
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Numerical Simulation of Frosting on Fin-and-Tube Heat Exchanger Surfaces

机译：翅片管热交换器表面磨砂的数值模拟

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摘要

Frost on heat exchanger fin surfaces increases the thermal resistance and blocks the air flow passages, which reduce the system energy efficiency. Therefore, investigations of frost formation especially simulations of frosting on the heat exchanger surfaces are essential for designing heat exchangers that operate with frosting. In this paper, the frost growth and densification processes on fin-and-tube heat exchanger surfaces are numerically investigated using a mass transfer model implemented as a user-defined function (UDF) in FLUENT. The model predicts the frost distributions on the heat exchanger surfaces, the temperature distributions, and the air flow pressure drop. The results show that the frost is thicker and the frost density is higher on the fin surfaces on the windward side near the tubes, while the frost is thinner and the density is lower near the inlet. Very little frost appears in the tube wake region. Frost on the fin-and-tube heat exchanger surfaces restricts the airflow and about doubles the pressure drop after frosting for 50 min. The simulated frost distributions and pressure drops are in good agreement with experimental data, which means that the frosting model can be used to predict frost layer growth on heat exchanger surfaces and the resulting airflow resistance.
机译：热交换器翅片表面上的霜会增加热阻并阻挡空气流动通道，这降低了系统能量效率。因此，对霜形成的调查特别是在热交换器表面上磨砂的模拟对于设计以磨砂操作的热交换器来说是必不可少的。在本文中，使用作为流畅的用户定义函数（UDF）实现的传质转移模型来数值研究了翅片管热交换器表面上的霜生长和致密化过程。该模型预测热交换器表面，温度分布和空气流量压降的霜分布。结果表明，霜冻较厚，在管道附近的迎风侧的翅片表面上较高，霜侧较薄，霜较薄，并且在入口附近较低密度。管唤醒区域出现很少的霜。翅片管热交换器表面上的霜限制了气流，并且在冻结后的压力下降50分钟。模拟霜分布和压降与实验数据很好，这意味着结霜模型可用于预测热交换器表面上的霜层生长和所得到的气流抗性。

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