内嵌百叶板换热器的壳程流动与传热特性

针对普通弓形板换热器折流板后易出现流动死区的现象,对折流板进行优化设计,并提出一种内嵌百叶板换热器.应用计算流体力学软件Fluent得到内嵌百叶板换热器壳程流场分布,并与普通弓形板换热器进行对比,分析百叶角度与百叶数量对换热器性能的影响.结果表明:与普通弓形板换热器相比,百叶可引流部分流体通过折流板,使内嵌百叶板换热器内流动死区面积明显减小,流场分布更加均匀,具有明显的减小壳程流体压降及提高壳程传热系数的作用;在研究范围内,当百叶角度为60°,百叶数量为每组4片时,换热器的综合性能最佳,综合评价因子可达1.76~2.05.

Flow and Heat Transfer Characteristics of Shell Side of Embedded Louver Heat Exchanger

Aiming at the phenomenon that the flow dead zone is easy to form behind the baffle plate of the common bow plate heat exchanger, the optimization design of the baffle plate was carried out, and an embedded louver heat exchanger was proposed. The computational fluid dynamics software Fluent was used to obtain the flow field distribution of shell side of the embedded louver heat exchanger, which was compared with the common bow plate heat exchanger. The effects of louver angle and number on the performance of the heat exchanger were analyzed. The results show that compared with the common bow plate heat exchanger, the louver guides part of the fluid through the baffle plate, so that the area of the dead zone in the embedded louver heat exchanger is significantly reduced, and the flow field distribution is more uniform. The effect of reducing the shell-side fluid pressure and increasing the shell-side heat transfer coefficient is obvious. In the scope of study, when the louver angle is 60° and the number is 4 pieces per group, the comprehensive performance of the heat exchanger is the best, and the comprehensive evaluation factor can reach to 1.76-2.05.