摘要
通过合理简化,建立管壳式换热器的实体模型,用大型CFD(computational fluid dynamics)软件FLUENT对于管壳式换热器壳程的流体流动与传热性能进行数值模拟研究.利用判断周期性充分发展段的3个主要特征,分别从压力差、无因次温度、速度3个方面,分析具有不同流体速度、不同流体介质、不同折流板间距时几种折流板管壳式换热器模型的进出口段对于壳程流体流动与传热性能的影响.结果表明,管壳式换热器结构一定的情况下,进出口段对壳程流体流动和传热周期性充分发展段的影响长度不随壳程流体性质、流动速度的变化而变化;随着折流板间距与筒体内径的比值增大而增大.
Numerical simulations for the shell-and-tube heat exchanger were carried out using the physical model with the CFD （computational fluid dynamics） software FLUENT. The characteristics of the fluid flow and the heat transfer in the shell side under different conditions were analyzed. The three main characteristics such as pressure gradient, dimensionless temperature and velocity were selected to ascertain the length of periodic fully developed section of the shell-and-tube heat exchanger. Some influence factors including fluid medium, fluid velocity in the shell side, and baffle pitch were analyzed. The affecting length of the inlet section and the outlet section on the fluid flow and the heat transfer is independent from the fluid physical properties, the fluid velocity in the shell side increases with the increase of the ratio of the baffle pitch to the distance of the inner diameter of the shell.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2009年第5期52-57,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
河南省杰出人才创新基金项目(0621001600)
关键词
管壳式换热器
数值模拟
进出口段
充分发展段
shell-and-tube heat exchanger
numerical simulation
inlet section and outlet section
fully developed section
