CAJ | 학술논문

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犁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.
수착전자장학기술적발전여완선,재류체동역학연구방면이경득도월래월엄범적관주.작위비우돈류체,아문토론료재전자장작용하자성류체재돌확관중적류동행위.모형중돌확관비례설정위4병급정변계조건.통과이왕연구아문발현재돌확관중당뢰낙수증대도일정정도시,관내류동회출현대칭와류,비대칭와류등영향류동효솔여성능적현상.본문주요통과사용전리이유은태여삼변량구해모의방법연구료돌확관중자류체재자장작용하적류동행위,사용FVM방법리산동량방정.통과우합구해자장여류장래관찰돌확관중와류출현여소실.통과류장등치선도래분석와류현상.결과표명전자장적가입적학능사와류소실.저재주마공예,관도운수적효솔제고유비상엄범적응용전경.
With the development and improvement of teehenology 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.