湿工况下平直翅片管换热器空气侧传热传质特性研究

Study of airside heat and mass transfer characteristics of plain finned tube heat exchangers in wet conditions

建立了湿工况下2排叉排平直翅片管换热器空气侧对流传热传质模型,利用Fluent软件进行了模拟,通过编写UDF(User-Defined Function)添加潜热换热质量源项、能量源项。模拟结果表明空气迎面风速、相对湿度以及壁面过冷度对显热换热系数的影响不大,但会对冷凝对流换热系数产生重要影响。

A three-dimensional numerical model was built up to study the airside heat and mass transfer characteristics of a two rows staggered plain finned tube heat exchanger in wet conditions. The simulations were carried out using Fluent software,and source terms were added to mass conservation equation and energy conservation equation using UDF( User-Defined Function). The simulation results showthat air velocity,relative humidity,wall temperature have little effects on the sensible heat transfer coefficient,but have important effects on the condensation heat transfer coefficient.