板翅式换热器封头结构的物流分配特性

数值研究了传统型封头结构对板翅式换热器内部物流分配的影响。数值计算结果表明,换热器内部存在严重的物流分配不均匀性,当平均雷诺数为1 000时,最大不均匀度达0.56。在对物流分配不均匀性分析的基础上,首次提出了曲面孔板封头结构,并对改进型封头结构进行了数值计算。计算结果表明,改进的封头结构可以有效地改善换热器内部的物流分配,并且比平面孔板封头结构更加有效,绝对不均匀度已从3.47减小到0.32。实验结果与数值计算结果对比表明二者吻合较好,说明了数学模型及算法建立的可靠性。

Flow distribution properties of header configuration in plate-fin heat exchangers

The influences of the conventional header configuration on the fluid flow distribution in plate-fin heat exchanger were numerically investigated.The numerical calculation results show that the fluid flow maldistribution is very serious in the heat exchanger.The maximal degree of flow nonuniformity can reach 0.56 when the average Reynolds is 1 000.On the basis of the analysis of the fluid flow maldistribution,the header configuration with curving perforated baffle was brought forward for the first time.The c...