一种强化换热流道的传热特性及流体扩散性分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Characteristics of Heat Transfer and Fluid Diffusion in a Heat Transfer Enhanced Duct

作者:: 王永庆; 朱冰; 赵頔; 靳遵龙; 1.郑州大学河南省过程传热与节能重点实验室,河南郑州,450001,2.河南化工职业学院化工系,河南郑州,450042

Author(s):: Wang Yongqing1; Zhu Bing2; Zhao Di1; Jin Zunlong1; 1. Henan Key Laboratory of Process Heat Transfer and Energy Saving, Zhengzhou University, Zhengzhou, Henan, 450001,2. Department of Chemical Engineering, Henan Vocational College of Chemical Engineering, Zhengzhou, Henan, 450042

Keywords:: laminar; heat transfer enhancement; diffusion character; convective heat transfer

摘要:: 以一种正交波纹流道为研究对象,应用CFD软件Fluent对其在低雷诺数下的特性进行了数值研究,并对数值结果进行了实验验证.研究表明,流体在较小的流速下,获得较好的传热效果.受流道的影响和流体黏性力的作用,随流体在流道中几何位置变化,流线间的相对位置与速度大小分布变化明显,在截面上形成了比较明显的二次流.流体受到了较大程度的拉伸与折叠作用,横截面内具有较大的横向速度分量且变化明显,流体在不同的几何位置处速度的大小与方向各不相同,不同位置处的流体质点受到不同的拉伸与折叠强度,形成复杂三维速度场,流道内形成较强的对流,增大了流体间的混合与传热.所得结论与研究方法可以为低雷诺数下流道内的传热、混合强化机理分析与结构优化提供参考.

Abstract:: The characteristics of a flow duct with orthogonal waves were numerical studied by using CFD code Fluent with a lower Reynolds number.The numerical simulations were verified by experimental results.The result indicated that heat transfer was enhanced in the duct with a lower fluid velocity.With the impact of duct geometry and fluid vicious force,the relative positions between streamlines and distribution of fluid velocity varied greatly with the fluid locations.Second flow came into being on cross sections along the duct.Fluid continually received strong function of stretching and folding,bearing varied bigger transverse velocity component.The magnitude and direction of fluid changed with the locations,and the intensity of stretching and folding changed as well.A complex 3D flow field was formed in the duct,which enhanced fluid mixing and heat transfer.The results and method could provide references for mechanism analysis and structure development.