内置螺旋线圈换热管换热分析及数值模拟

摘要

概述了螺旋线圈装置的强化传热原理。通过建立光管和内置螺旋线圈换热管的三维流动模型，利用Fluent软件以黏性流体变压器油为研究对象对换热管内速度场、温度场、压力场以及换热过程进行了数值模拟。对比两种模拟结果表明，内置螺旋线圈的换热管内流体流动比较复杂，流体在近壁面处呈明显的螺旋流动，流体的径向速度和切向速度都有提高。总的来说，换热管内布置了螺旋线圈以后流体在其中的流动比在光管内有更强的湍流度，且能够打破流体的速度边界层，增强了流体的对流换热，极大提高了传热系数。%The strengthening heat transfer principle of the wire coil equipment is summarized. The three-di-mensional simulation of the plain tube and heat exchange tube with wire coil has been performed using the FLUENT software. The velocity,temperature and pressure distribution as well as thermal process is obtained. The results showed that the flow characteristics in the heat exchange tube with wire coil was more complex than that in the plain one and the fluid near the wall presented apparent spiral flow. Meanwhile,the radial and tan-gential velocity both increased obviously. In general,the turbulence intensity was strengthened in the heat ex-change tube with wire coil. Moreover,the velocity boundary layer was broken,and the heat convection was en-hanced. So,the heat coefficient was improved tremendously.