波纹翅片型换热器结霜过程模拟

Frost simulation of the heat exchanger with wavy plates

基于波纹翅片霜层的形成过程,建立二维CFD模型,运用欧拉多相流模型结合UDF对不同工况下霜层生长过程进行数值模拟。对水蒸气质量分数分布、冰的体积分数、温度分布、湿空气速度分布和霜层密度分布以及空气速度和冷表面温度对霜层厚度的影响进行了分析。结果表明:沿湿空气流动方向,水蒸气的质量分数逐渐降低。霜层温度沿高度方向逐渐增加,波峰冰的体积分数大于波谷。靠近冷表面区域霜层的密度最大,60 min时,霜层的平均密度为97 kg/m^(3)。冷表面温度为-13℃时霜层厚度比-10℃增加了39.8%,进口速度由0.6 m/s增加至0.8 m/s,霜层厚度增加了3.2%。

Based on the formation process of frost layer of a wavy plates,a two-dimensional CFD model was established,an Euler multi-phase flow model was combined with UDF to simulate the frost process of frost layer with different working conditions.The water vapor mass fraction distribution,volume fraction of ice,temperature distribution,humid air velocity distribution,frost layer density distribution,and the influence of air velocity and cold surface temperature on frost layer thickness were analyzed.The results show that the mass fraction of water vapor gradually decreases along the direction of wet air flow.The frost layer temperature is gradually increased along the height direction,and the volume fraction of the ice at the peak is larger than in the trough.The density of the frost layer is greatest near the cold surface area,and the average density of the frost layer is 97 kg/m^(3)at 60 min.When the cold surface temperature is -13℃,the frost layer thickness increases by 39.8% compared to -10℃,the inlet velocity increases from 0.6 m/s to 0.8 m/s,and the frost layer thickness is increased by 3.2%.