连续螺旋折流板换热器壳侧传热与流动特性的数值研究  

Numerical Investigation on Heat Transfer and Flow Properties in Shell-side of Heat Exchanger With Continuous Helical Baffles

作　　者：汲水[1] 杜文静[1] 程林[1] 

机构地区：[1]山东大学热科学与工程研究中心,山东省济南市250061

出　　处：《中国电机工程学报》2009年第32期66-70,共5页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2007CB 206900)~~

摘　　要：基于连续螺旋折流板换热器的三维模型,采用RNGk-ε湍流模型,借助计算流体力学(computational fluid dynamics,CFD)软件对壳侧流动与传热进行了数值模拟。结果表明:同壳侧流量下,螺旋角为15°的连续螺旋折流板换热器的壳侧换热系数和压降略大于弓形折流板换热器,其余各连续螺旋折流板换热器的壳侧换热系数和压降均小于弓形折流板换热器;随螺旋角的增大,连续螺旋折流板换热器的壳侧换热系数和压降减小。通过对连续螺旋折流板换热器壳侧流体温度和速度分布的分析发现,靠近中心假管的换热管换热性能优于其他区域的换热管。最后对连续螺旋折流板换热器螺旋角的选择提出了建议。Based on the 3-dimensional physical model of the heat exchanger with continuous helical baffles （HXsHB）, by means of computational fluid dynamics （CFD） software, the RNG k-ε turbulent model was adopted to simulate the heat transfer and flow properties in the shell side. The numerical results show that the HXsHB with 15° helix angle offer a higher heat transfer coefficient and pressure drop than that of heat exchanger with segmental baffles （HXsSB） under the same flow rate condition. The HXsHB with other helix angles offer lower heat transfer coefficient and pressure drop compared with that of HXsSB. With the increasing of helix angle, heat transfer coefficient and pressure drop in the shell side of HXsHB decrease. The local distributions of temperature and velocity vector in the shell side fluid were analyzed. The results indicate that heat exchange tubes adjacent to central dummy tube have a better heat transfer performance. Selection method on helix angles for HXsHB was discussed in the end.

关 键 词：连续螺旋折流板 换热器 数值模拟 螺旋角 传热 压降 

分 类 号：TK124[动力工程及工程热物理—工程热物理]