螺旋折流板菱形翅片管换热器的传热与流阻性能

Experimental investigation of heat transfer and flow resistance performance on heat exchanger with lozenge fin tubes supported by helical baffles was carried out. Under the experimental conditions,curves of relation between heat transfer film coefficient and flow velocity,relation between flow resistance coefficient and velocity were obtained,which provides references for industrial application of this type of heat exchanger. Experimental results indicated that within the range of diesel oil flow velocity 0.22-0.85 m·s -1,heat transfer film coefficient in shell side of heat exchanger with lozenge fin tubes supported by helical baffles was 512-1378?W·m -2·K -1,which was 54%-108% higher than that of heat exchanger with smooth tubes supported by helical baffles,while flow resistance coefficient was lower by 5%-30%,which showed that heat exchanger with lozenge fin tubes supported by helical baffles had favorable heat transfer and flow resistance performance.

菱形翅片管的强化传热特性

简要介绍了一种新型强化传热管———菱形翅片管的结构和强化传热机理 ,并通过两组对比试验研究其强化传热特性。研究结果表明 :菱形翅片管的三维翅片可以较大幅度提高换热器总传热系数和壳侧传热膜系数 ,对于对流和冷凝传热都有较好的强化效果。菱形翅片管加工成本较低 ,传热性能较好 ,在石油化工等行业推广应用前景广阔。

空心环支承菱形翅片管油冷凝器传热性能

以柴油蒸气为工质,通过对比试验,研究1种壳程结构采用空心环管间支承的新型油冷凝器的传热性能,得到了2种油冷凝器的总传热系数和壳侧冷凝对流传热系数随热负荷变化的关系曲线。在本实验研究的条件范围内,空心环支承菱形翅片管油冷凝器具有较好的冷凝传热效果。