On natural solutal convection in magnetic fluids
On natural solutal convection in magnetic fluids
复制标题
DOI：
10.1063/1.4930601
复制
发表时间：
2015-09
影响因子：
4.6
通讯作者：
A. S. Ivanov;A. Pshenichnikov
中科院分区：
文献类型：
--
作者：
A. S. Ivanov;A. Pshenichnikov
进行了一项实验，研究由垂直 Hele-Shaw 池中胶体颗粒的非均匀初始分布引起的磁流体中的自然溶液对流。在实验中，我们使用了“磁铁矿-煤油-油酸”类型的稀磁性流体。颗粒的初始分布是通过滴状聚集体的磁泳及其在位于细胞中心的抗磁性盘表面上的沉积而形成的。在系统上施加磁场导致瑞利-泰勒不稳定性的开始和下降对流喷流的形成。针对不同的细胞厚度值（高达 0.18 毫米）和产生滴状聚集体的磁场强度（高达 21 kA/m），测量了下降射流前端的流速。溶质瑞利数在 Ra = 50–105 范围内变化。结果表明，对流的强度以雷诺数 Re 为特征，随着瑞雷数的增加而增加......
An experiment was carried out to investigate natural solutal convection in a magnetic fluid caused by non-homogeneous initial distribution of colloidal particles in a vertical Hele-Shaw cell. For experiment, we used a dilute magnetic fluid of the “magnetite–kerosene–oleic acid” type. The initial distribution of particles was formed by magnetophoresis of the drop-like aggregates and their sedimentation on the surface of the diamagnetic disk located in the center of the cell. Application of the magnetic field on the system led to the onset of the Rayleigh-Taylor instability and formation of descending convective jets. The velocity of the flow at the front of descending jets was measured for different values of cell thickness (up to 0.18 mm) and strength of the magnetic field generating the drop-like aggregates (up to 21 kA/m). The solutal Rayleigh numbers varied in the range Ra = 50–105. It was shown that the intensity of the convective flow characterized by the Reynolds number Re, increases with the Raylei...