Magneto-hydrodynamic stirrer for stationary and moving fluids
Magneto-hydrodynamic stirrer for stationary and moving fluids
复制标题
DOI：
10.1016/j.snb.2004.07.011
复制
发表时间：
2005-05-13
影响因子：
8.4
通讯作者：
Bau, HH
中科院分区：
文献类型：
--
作者：
Qian, S;Bau, HH
设计了一种具有混沌平流特性的磁流体动力（MHD）硬体，并对其进行了建模和测试。刚性可以作为一个独立的组件操作，也可以合并到mhd控制的网络中。刚性板由一个导管组成，该导管沿其相对的壁面装有单独控制的电极。导管内充满电解质溶液，并置于均匀磁场中。当一对或一组电极之间施加电位差时，产生的电流与磁场相互作用，引起洛伦兹力和流体运动。当电位差作用在彼此相对的电极上时，流体就会沿着导管的长度被推进。当电位差施加在对角线位置的电极上时，就会产生循环运动。当电位差在两个或多个这样的构型之间周期性交替时，混沌运动就会发展，从而获得有效的混合。这个装置既可用作搅拌器又可用作泵。与之前设计的MHD搅拌器相比，该设备的优势在于它不需要将电极放置在远离导管壁的地方。由于该装置没有活动部件，因此该概念特别适用于微流体应用。(c) 2004 Elsevier B.V.版权所有
A magneto-hydrodynamic (MHD) stiffer that exhibits chaotic advection is designed, modeled, and tested. The stiffer can operate as a stand-alone component or it can be incorporated into a MHD-controlled network. The stiffer consists of a conduit equipped with individually controlled electrodes positioned along its opposing walls. The conduit is filled with an electrolyte solution and positioned in a uniform magnetic field. When a potential difference is applied across pairs or groups of electrodes, the resulting current interacts with the magnetic field to induce Lorentz forces and fluid motion. When the potential difference is applied across opposing electrodes that face each other, the fluid is propelled along the conduit's length. When the potential difference is applied across diagonally positioned electrodes, a circulatory motion results. When the potential difference alternates periodically across two or more such configurations, chaotic motion evolves and efficient mixing is obtained. This device can serve as both a stirrer and a pump. The advantage of this device over previous designs of MHD stirrers is that it does not require electrodes positioned away from the conduit's walls. Since this device has no moving parts, the concept is especially suitable for microfluidic applications. (c) 2004 Elsevier B.V. All rights reserved.