【摘要】 为提供铁磁流体轴承的材料选择、结构设计和优化的依据 ,在 KRUSS K12表面张力仪上用 Wilhelmy法对几种铁磁流体的表面张力进行了测试 ,考察了铁磁流体的表面张力随温度和磁场强度及方向的变化规律。实验结果表明 :铁磁流体的表面张力随温度的升高而减小。而磁场对铁磁流体表面张力的影响与磁场的方向有关。当磁场方向平行于吊片时 ,表面张力随磁场强度的增加而增大 ;而当磁场方向垂直于吊片时 ,表面张力随磁场强度的变化不明显。铁磁流体表面张力的变化与其流变性质无关更多还原

【Abstract】 Wilhelmy method was used to study the surface tension of several kinds of ferrofluids with a KRUSS K12 tensiometer for various temperatures and magnetic field strengths and directions. The experimental results indicate that the surface tension of ferrofluids decreases with increasing temperature. The effects of the magnetic field depend on its direction. When the magnetic field direction is parallel to the Wilhelmy plate, the surface tension increases with increasing magnetic field strength. When it is perpendicular to the plate, the surface tension variation is not obvious. The variation of the surface tension of ferrofluids is not related to its rheological performance. The measurement results provide the basis for the design of ferrofluid bearings.更多还原