磁场强化竖直平板自然对流传热特性研究  

Research on heat transfer characteristics of natural convection of vertical plate strengthened by magnetic field

作　　者：姜昌伟[1] 郑佩佳 谢云峰 曹志超 罗铭宏 JIANG Changwei;ZHENG Peijia;XIE Yunfeng;CAO Zhichao;LUO Minghong(School of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2023年第1期95-103,共9页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(11572056、51674042)。

摘　　要：【目的】研究梯度磁场对竖直平板自然对流散热的影响,以提供一种强化竖直平板对流散热的新方法。【方法】构建磁致自然对流数学模型并编制相应的有限元程序;分析不同磁体剩余磁通密度、不同磁体位置情况下磁场强化竖直平板自然对流的传热规律;比较有无梯度磁场情况下竖直平板自然对流的传热特征。【结果】当磁体剩余磁通密度B_(r)>1 T时,竖直平板的对流传热能力随着磁体剩余磁通密度的增大而增强;当磁体位于竖直平板下端时,磁体对自然对流散热影响最大;两组磁体情况下比单组磁体情况下竖直平板的对流散热能力强。【结论】施加磁场可以强化或控制竖直平板自然对流散热。[Purposes]The paper aims to study the influence of gradient magnetic field on natural convection heat dissipation of the vertical plate,which provides a new method to strengthen convection heat dissipation of the vertical plate.[Methods]The mathematical model of magnetically induced natural convection was constructed and the corresponding finite element program was written.The heat transfer law of magnetic field strengthening natural convection of the vertical plate under different magnet remanent flux density,different magnet position were analyzed.The heat transfer characteristics of the vertical plate with or without gradient magnetic field were compared.[Findings]When the magnet remanent flux density B_(r)>1 T,the convective heat transfer capacity of the vertical plate increases with the increasing of the magnet remanent flux density of the magnet.When the magnet is located at the bottom of the vertical plate,it has the greatest influence on natural convection heat dissipation.The convective heat dissipation capacity of the vertical plate with two groups of magnets is stronger than that with single group of magnets.[Conclusions]The natural convection heat dissipation of the vertical plate can be strengthened or controlled by applying magnetic field.

关 键 词：热磁对流 竖直平板 传热特性 梯度磁场 磁体位置 

分 类 号：TK124[动力工程及工程热物理—工程热物理]