磁场作用下弯管内铁磁流体涡流发展及其强化传热  

Eddy development and heat transfer enhancement of ferrofluid in curved pipe under magnetic field

作　　者：王翠华[1] 王鑫皓 隋佳旭 张先珍[1] 龚斌[1] WANG Cuihua;WANG Xinhao;SUI Jiaxu;ZHANG Xianzhen;GONG Bin(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning Province,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142

出　　处：《化学工程》2025年第4期48-53,共6页Chemical Engineering(China)

基　　金：辽宁省教育厅面上项目(LJKZ0447,LJKMZ20220775)。

摘　　要：为深入研究外磁场对弯管内铁磁流体传热的影响规律,基于有限元法采用CFD模拟方法对不同曲率(K=0.014—0.02)弯管在不同雷诺数(Re=800—2000)下施加不同磁感应强度(B=0—0.1 T)的外磁场时的强化传热特性进行研究,重点对比分析K=0.02时B=0—0.1 T外磁场作用下弯管内铁磁流体的涡流特点及传热特性。结果表明:低雷诺数时施加较大的外磁场后,离心力和磁场力的耦合作用使管中流体产生了复杂的旋流流动,Nu增大明显,在所研究的K和Re的范围内,与不加磁场时相比,对弯管施加B=0.1 T的磁场,其Nu最C_(3)N_(4)大增加了42.36%,且曲率越小,强化传热效果越明显。当Re较大时,对3种曲率的弯管施加B=0.1 T的磁场都会轻微抑制流体传热。综上考虑,雷诺数较低、曲率较小时,对弯管施加一定的外磁场可以显著强化其传热。In order to comprehensively study the effect of the external magnetic field on the heat transfer of ferrofluid in the bend,the enhanced heat transfer characteristics of the bending pipe with different curvature(K=0.014-0.02)and different magnetic field intensity(B=0-0.1 T)under different Reynolds number(Re=800-2000)were studied by CFD simulation method based on the finite element method.The eddy current and heat transfer characteristics of ferromagnetic fluid in a bend tube with K=0.02 and B=0-0.1 T external magnetic field were mainly analyzed.The results show that after applying a large external magnetic field at low Reynolds number,the coupling effect of centrifugal force and magnetic force causes the fluid in the tube to produce a complex swirl flow,and Nu increases significantly.In the studied range of K and Re,compared with no magnetic field,Nu increases by 42.36%to the maximum when applying a magnetic field of B=0.1 T to the curved pipe,and the smaller the curvature,the more obvious the heat transfer effect.When Re is large,applying a magnetic field of B=0.1 T to the three curved pipes can slightly inhibit the fluid heat transfer.To sum up,when the Reynolds number is low and the curvature is small,applying a certain external magnetic field to the bent pipe can significantly enhance its heat transfer.

关 键 词：弯管 铁磁流体 磁场 强化传热 多场耦合 

分 类 号：TK121[动力工程及工程热物理—工程热物理]