磁场诱导矩形通道内铁磁流体流动及强化传热
Flow and heat transfer enhancement of ferrofluid in rectangular channels induced by magnetic field
王翠华 1贾泽鹏 1隋佳旭 1王鑫皓 1张先珍 1龚斌1
作者信息
- 1. 沈阳化工大学机械与动力工程学院,辽宁 沈阳 110142
- 折叠
摘要
为深入研究外加磁场作用下矩形通道中铁磁流体的流动及换热性能,基于有限体积法对其进行数值仿真计算.分析铁磁流体在不同雷诺数Re、磁场强度B下对努塞尔数Nu及流体阻力系数f的影响,重点对比3种热边界条件下磁场诱导铁磁流体旋流流动的特点、强化传热效果及综合强化性能.结果表明:当外加磁场作用于铁磁流体时,由于磁场-流场-温度场的协同作用,3种热边界条件下,矩形通道内的铁磁流体均产生不同结构的旋流流动,明显强化其传热效果,且施加的磁场强度越大,强化传热效果越好,综合性能更优.在研究范围内,通过对3种热边界条件的比较,四面受热、上下两面受热和底面受热的综合强化因子最大值分别达到了 1.372、2.277、2.299.
Abstract
In order to comprehensively investigate the flow and heat transfer performance of ferrofluid in rectangular ducts under external magnetic field,numerical simulations were conducted based on the finite volume method.The impact of Reynolds number Re and magnetic field strength B on Nusselt number Nu and fluid friction factor f was analyzed.The characteristics of swirling flow induced by magnetic field,the effect of heat transfer enhancement and the comprehensive enhancement performances were emphatically compared under three different thermal boundary conditions.The results indicate that when an external magnetic field acts on the ferrofluid,the swirling flow with different structures of the ferromagnetic fluid in the rectangular channel for three different thermal boundary conditions is generated due to the synergistic effect of magnetic field,flow field and temperature field,which enhances heat transfer significantly.Moreover,the greater the applied B,the better the enhanced heat transfer effect and the better overall performance.Within the scope of the study,the comparison of the results for three thermal boundary conditions shows that the maximum comprehensive strengthening factors for four sides heating,upper and lower surface heating,and bottom surface heating are 1.372,2.277 and 2.299,respectively.
关键词
铁磁流体/矩形通道/磁场/强化传热/旋流流动Key words
ferrofluids/rectangular channel/magnetic/heat transfer enhancement/swirling flow引用本文复制引用
基金项目
辽宁省教育厅面上项目(LJKZ0447LJKMZ20220775)
出版年
2024
国家科技期刊平台
NSTL
万方数据