波纹型螺旋板式热交换器的传热性能研究

Study on Heat Transfer Performance of the Corrugated Spiral Plate Heat Exchanger

目的:本文将波纹结构应用到螺旋板式换热器设计中,使流道为“非平行换热通道”,增大流体垂直于壁面方向的速度分量,提高螺旋板式换热器的综合性能。方法:通过正交试验,应用有限元分析软件,模拟九组波纹板参数组合的波纹型螺旋板式热交换器的阻力和传热性能。结果:在九组试验中,当雷诺数为33 278,波纹半径为14.3 mm、波高为3.5 mm和波距为68.0 mm时,波纹型结构螺旋板式热交换器的综合评价系数是1.494。波高对综合性能影响最大,波距次之,波纹半径最小;归纳总结得到H/h与Nu的准则关系式。结论:波高h为影响综合评价系数的主要因素。雷诺数在12 799~46 079区间内,波纹结构对螺旋板式换热器的综合评价系数具有积极影响,有利于提高螺旋板式换热器的综合性能。

Purpose:In this paper,the corrugated structure is applied to the design of the spiral plate heat exchanger,so that the flow channel is a“non-parallel heat exchange channel”,which increases the velocity component of the fluid perpendicular to the wall surface and improves the comprehensive performance of the spiral plate heat exchanger.Method:The resistance and heat transfer performance of the corrugated spiral plate heat exchanger with 9 groups of corrugated plate parameters are simulated by orthogonal test and finite element analysis software.Results:In nine groups of tests,when the Reynolds number is 33278,the corrugation radius is 14.3 mm,the wave height is 3.5 mm and the wave pitch is 68.0 mm,the comprehensive evaluation coefficient of the corrugated spiral plate heat exchanger is 1.494.The wave height has the greatest impact on the overall performance,followed by the wave pitch,and the corrugation radius has the least impact;the criterion relationship between H/h and Nu is obtained by induction.Conclusion:The wave height h is the main factor affecting the comprehensive evaluation coefficient.When the Reynolds number is in the range of 12799~46079,the corrugated structure has a positive impact on the comprehensive evaluation coefficient of the spiral plate heat exchanger,which is beneficial to improve the comprehensive performance of the spiral plate heat exchanger.