摘要
对于单管程管壳式换热器的研究已经非常深入,但对于三种双管程管壳式换热器内部流动和传热机理的研究文献较少,本文建立了单管程换热器、固定管板式双管程换热器、U型管式双管程换热器、浮头式双管程换热器数值计算模型,通过获得的速度场、温度场等参数分析其壳程和管程流动与传热特性的异同。研究结果表明,双管程换热器强化传热根本机理是管程同等质量流量下,双管程换热器管程流速和流程相较于单管换热器皆提升一倍。单管程换热器和固定管板式双管程换热器不适用于温差较大的场合,U型管式双管程换热器和浮头式双管程换热器的管束一端可自由伸缩,适用于大温差场合。三种双管程换热器的壳程h/Δp远大于单管程换热器,管程h/Δp远小于单管程换热器。本研究可为热力系统中双管程换热器的使用和应用提供理论参考。
There have been many studies on single tube and shell heat exchangers,but there is little research on the internal flow and heat transfer mechanisms of three types of double tube and shell heat exchangers.This article establishes numerical calculation models for single tube heat exchangers,fixed tube double tube heat exchangers,U-shaped tube double tube heat exchangers,and floating head double tube heat exchangers.Through the obtained velocity and temperature fields,the differences and similarities in the flow and heat transfer characteristics of the shell and tube sides are analyzed.The research results indicate that the fundamental mechanism for enhancing heat transfer in dual tube heat exchangers is that,under the same mass flow rate on the tube side,both the flow rate and flow rate are doubled.Single tube heat exchangers and fixed tube sheet double tube heat exchangers are not suitable for situations with large temperature differences.U-shaped tube double tube heat exchangers and floating head double tube heat exchangers have one end of the tube bundle that can be freely extended and extended,making them suitable for situations with large temperature differences.The shell side comprehensive performance of the three types of double tube side heat exchangers is much higher than that of single tube side heat exchangers,while the tube side comprehensive performance is much lower than that of single tube side heat exchangers.This study can provide theoretical reference for the use and application of dual tube heat exchangers in thermal systems.
作者
徐义程
XU Yi-cheng(School of Mechanical Engineering,Anhui University of Technology,Maanshan 243000,China)
出处
《山东工业技术》
2024年第3期74-81,共8页
Journal of Shandong Industrial Technology
关键词
管壳式换热器
双管程换热器
U型管
计算流体力学
shell and tube heat exchanger
dual tube heat exchanger
U-tube
computational fluid dynamics
