突扩管中磁流体在电磁场作用下的流动模拟(英文)  

Modelirig of magnetic fluids in an abrupt expansion:behaviors under electromagnetic field

作　　者：蒋峻峰[1] 洪若瑜[1,2] 李洪钟[2] 

机构地区：[1]苏州大学材料与化学化工学部,江苏省有机合成重点实验室,江苏215123 [2]中国科学院过程工程研究所多相反应国家重点实验室,北京100080

出　　处：《计算机与应用化学》2009年第12期1609-1613,共5页Computers and Applied Chemistry

基　　金：国家自然科学基金(编号:20876100,20736004);国家重点基础研究发展计划(973项目,编号:2009CB219904);中国科学院过程工程研究所多相反应国家重点实验室基金(编号:2006-5);江苏省有机合成重点实验室基金;国家教委留学回国基金;江苏省博士后科学基金;国家博士后基金(20090451176);苏州市科技局项目(YJS0917,SG0978)

摘　　要：随着电磁场学技术的发展与完善,在流体动力学研究方面已经得到越来越广泛的关注.作为非牛顿流体,我们讨论了在电磁场作用下磁性流体在突扩管中的流动行为.模型中突扩管比例设定为4并给定边界条件.通过以往研究我们发现在突扩管中当雷诺数增大到一定程度时,管内流动会出现对称涡流,非对称涡流等影响流动效率与性能的现象.本文主要通过使用典型二维稳态与参变量求解模拟方法研究了突扩管中磁流体在磁场作用下的流动行为,使用FVM方法离散动量方程。通过耦合求解磁场与流场来观察突扩管中涡流出现与消失.通过流场等值线图来分析涡流现象.结果表明电磁场的加入的确能使涡流消失.这在注磨工艺,管道运输的效率提高有非常广泛的应用前景.With the development and improvement of techenology of electromagnetism, the application of electromagnetic field in fluid dynamics is increasing nowadays. As a kind of non-Newtonian fluids, the magnetic fluids （MFs） flowing through an abrupt expansion under influence of electromagnetic field was studied numerically. Geometry with a given ratio of four and specified boundary conditions were provided in this paper. It is known that with the increase of Reynolds number （Re）, appearance of symmetrical and asymmetrical vortexes will influence the efficency and performace of fluid flowing across an expansion. The finite volume method （FVM） was applied to discrete the Navier-Stokes equation, in which the electromagnetic force was added as source item. The problem under typical two-dimensional stationary or parametric laminar flow was investigated. Results showed that the vortexes would disappear after the addition of electromagnetic force, which offered us a better approach to solve cavities formed in tubes.

关 键 词：非牛顿流体 磁流体 层流 参变法 突扩管 电磁场 

分 类 号：TQ015.9[化学工程] O6-39[理学—化学]