恒壁温工况下螺旋管内流体强化传热数值模拟研究  

Numerical simulation of fluid enhanced heat transfer in a helical tube under constant wall temperature condition

作　　者：张周卫[1,2] 李跃[1] 汪雅红 李河[1] 

机构地区：[1]兰州交通大学环境与市政工程学院 [2]甘肃中远能源动力工程有限公司

出　　处：《制冷与空调》2016年第2期43-48,共6页Refrigeration and Air-Conditioning

基　　金：国家中小企业创新基金项目(12C26216207017;13C26216205878)

摘　　要：恒壁温条件下,以螺旋管内流体的流动及传热状况为模拟研究对象,并通过综合性能评价因子,比较不同几何参数下螺旋管的强化传热性能,得到沿轴向不同截面螺旋管内流体的速度场、温度场分布规律,及综合性能评价因子随螺旋直径、螺距、管道直径等几何参数的变化曲线。结果表明:转角增大,二次流作用加强,导致垂直于轴向截面的最大速度向管的外侧移动,同时在热边界层和二次流的共同作用下使得热量由内侧边界层逐渐向流体核心区传递,温度分布成内凹的圆弧形状。螺旋管的强化传热随其几何参数的变化呈现不同的变化规律,与螺旋直径、管道直径相比,螺距对强化传热的影响基本可忽略不计,另外从强化传热角度考虑,对螺旋管选型时应优先考虑管道直径。Under constant wall temperature condition,the flow and heat transfer of the fluid inside the tube are simulated,And through the comprehensive performance evaluation factor,the enhanced heat transfer performance of the helical pipe with different geometrical parameters is compared.It is obtained that the velocity field and temperature field distribution of the fluid in different section of the spiral pipe along the axial direction.Andthe change curves of the helical diameter,pitch,diameter of the pipe and other parameters of the spiral pipe.The results show that：with the increase of the angle,the two flow is enhanced,and the maximum speed of vertical axial section gradually move to the outside of the tube,At the same time,Under the common action of the thermal boundary layer and the two flow,the heat is transferred from the inner boundary layer to the core region of the fluid,and the temperature is distributed into the concave arc shape.With the enhancement of heat transfer parameters of spiral tube changes have different variation,Compared with diameter pipe diameter,the influence of pitch on heat transfer is negligible,and the pipe diameter is preferred in the selection of helical tube.

关 键 词：螺旋管 数值模拟 评价因子 强化传热 

分 类 号：TE965[石油与天然气工程—石油机械设备]