| 摘要: |
| 刘易斯因子是反映湿工况下空气侧热质传递特性的重要参数。在此提出了可计算湿工况下翅片侧刘易斯因子的数值模型和适用于工程应用的关联式，通过建立相间传质数值模型、潜热传递数值模型，利用CFD分别计算出空气侧的热质传递系数，从而求得刘易斯因子的数值解。利用数值仿真方法分析了翅片管换热器结构和运行工况对刘易斯因子的影响和已有热质传递类比关系的适用性；同时采用刘易斯因子的数值计算结果拟合得到关联式。传热和传质数值计算结果和实验的相对误差分别为6.93%和12.1%；关联式与数值模型之间的相对误差为5.52%。该数值模型有足够的精度与适用面，所得关联式可代替数值模型。 |
| 关键词: 热工学 刘易斯因子 数值仿真 热质传递 类比关系 翅片管式换热器 |
| DOI： |
| 投稿时间：2012-02-01
|
| 基金项目: |
|
| A Numerical Study of Lewis Factor for Fin-and-tube Heat Exchangers under Dehumidifying Conditions |
|
Han Weizhe, Ding Guoliang, Hu Haitao, Zhuang Dawei
|
| (Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiao Tong University) |
| Abstract: |
| Lewis factor is an important parameter for heat and mass transfer process at dehumidifying conditions. A numerical model for calculating the Lewis factor and a correlation for engineering calculation are established. The Lewis factor is obtained through the numerical model of heat and mass transfer of air-side including the mass transfer between phases and the latent heat transfer using CFD. The effects of fin-and-tube heat exchanger geometries and working conditions as well as the feasibility of existing heat and mass transfer analogies are analyzed. Also the Lewis factor correlation is established through the numerical results. The heat and mass transfer deviations between numerical model and experimental data are 6.93% and 12.1% respectively. The correlation has relative deviation of 5.52% compared with numerical model. The results show that the obtained correlation has sufficient accuracy and applicability instead of numerical model. |
| Key words: pyrology lewis factor numerical simulation heat and mass transfer analogy relationship fin-and-tube heat exchangers |
