Abstract
Thermophysical property of magnetic fluid is varied by applying external magnetic field related with magnetic field intensity, magnetic field direction and elapsed time of applying magnetic field because of the cluster formation. In this study, dependence of time variation in thermal diffusivity of magnetic fluid on magnetic field intensity was investigated experimentally. Forced Rayleigh scattering method, which has high temporal and high spatial resolution, was applied to measure time variation of the thermal diffusivity of magnetic fluid. The results show that the strong anisotropy of thermal diffusivity is obtained by applying strong magnetic field and thermal diffusivity changes over the time of applying magnetic field. In contrast, anisotropy of thermal diffusivity is hardly observed when the weak magnetic field is applied to magnetic fluid.
