0 引言
1 换热器计算模型与边界条件
1.1 计算模型
Fig. 1 Schematic diagram of the trefoil expansion tube图1 三叶膨胀管结构示意图 |
Fig. 2 Schematic diagram of the trefoil expansion tube heat exchanger图2 三叶膨胀管换热器结构示意图 |
Fig. 3 Physical model of the trefoil expansion tube heat exchanger图3 三叶膨胀管换热器计算物理模型 |
Fig. 4 Grids system图4 网格图 |
1.2 边界条件
1.3 网格无关性验证
Fig. 5 Grid independence validation图5 网格无关性验证 |
2 计算方法验证
Fig. 6 Diagram of the experimental system图6 实验测试流程图 |
Fig. 7 Comparison of experimental value and numerical value图7 实验值与模拟值对比:(a)壳程换热系数;(b)壳程压降 |
3 结果与讨论
Fig. 8 Relation between shell-side heat transfer coefficient with velocity图8 壳程换热系数与流速之间的关系 |
Fig. 9 Relation between shell-side pressure drop with velocity图9 壳程压降与流速之间的关系 |
Fig. 10 Relation between shell-side h/ΔP with velocity图10 壳程h/ΔP与流速之间的关系 |
Fig. 11 Relation between shell-side h/ΔP with volume flow rate图11 壳程h/ΔP与体积流量之间的关系 |
Fig. 12 Relation between shell-side Nu/f1/3 with volume flow rate图12 壳程Nu/f1/3与体积流量之间的关系 |
4 流场显示与分析
Fig. 13 Shell-side stream traces of trefoil expansion tube heat exchanger图13 三叶膨胀管换热器壳程流线图 |
Fig. 15 Temperature distribution of outlet图15 出口处温度云图分布 |
Fig. 16 Velocity distribution of outlet图16 出口处速度云图分布 |
Fig. 17 Secondary flow distribution of outlet图17 出口处二次流云图分布 |