Study on the Manufacturing Process of Magneto-Rheological Fluids

• Main Authors: Kuang-Hong Hsu, 徐光宏
• Other Authors: Chao-Kuang Chen
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/awfj3q

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 90 === ABSTRACT The application of the magnetorheological fluid （MR）is very board, especially in the chemical, optical, and mechanical industry. In contrast to the traditional viscoplastic fluid, the flow characteristic of the MRF could be changed when applying an external magnetic field. The hydrodynamic mechanism altered when the strength of the applying field decreased or increased. From the theoretical and experimental result, the shear rate and the viscosity of the MRF will follow a certain pattern or rule as the strength of the field changed. It could be explained as the magnetic property of the MRF changed due to the magnetic suspension particles added into the dispersed carrier fluid re-structured. The inter-particle force between these suspension ferro-particles will interact with the hydrodynamic force and compete with each other. The co-precipitation method has been used to prepare the ultrafine particles, which are further dispersed in the kerosene with the surfactant oleic acid. Several process variables have been tried for testing the interaction between the ultrafine particles, and surfactants, and their effects on the stability of magnetic fluid have been also discussed.