磁流体浸没物磁场力分析及磁浮特性

物体浸没于磁流体中表现出磁浮特性，对其受力状态分析是准确描述其悬浮状态的前提和基础。基于非线性磁流体应力张量模型和稳态Bernoulli方程，建立磁流体中浸没物受力模型。借助非磁性体受力模型的简化计算方法以及磁性体与磁流体之间的多场效应关系，分别对非磁性体、磁性体两类浸没物在磁流体中所受磁浮力进行分析，结果表明非磁性浸没物在磁流体中仅受到外加磁场贡献的一次磁浮力，而磁性浸没物除受到一次磁浮力外，还受到其自身激发磁场贡献的二次磁浮力．永磁体在磁流体中位置决定的磁浮力满足一定条件时，永磁体能够自悬浮于磁流体中。

Magnetic force analysis of immersed body in magnetic fluids and its magnetic levitation characteristic

The magnetic levitation phenomenon is present when the body is immersed in the magnetic fluids. The force analysis on the body is premise and basis to depict its levitation state exactly. Based on the stress tensor of nonlinear magnetic fluids and the Bernoulli equation, the force model for immersed body in magnetic fluids is proposed. At the same time, the magnetic buoyancy force on magnetic and nonmagnetic immersed bodies is analyzed separately in virtue of the force model of immersed body and multi-field coupling effect between magnetic body and magnetic fluids, it is show that nonmagnetic immersed body only suffers first magnetic buoyancy force by applied magnetic field, while magnetic immersed body bears secondary magnetic buoyancy force by self-excitation magnetic field included first magnetic buoyancy force. Specially, permanent magnet can self-levitate in magnetic fluids as the condition of magnetic buoyancy force which is influenced by the position of permanent magnet in magnetic fluids is satisfied.