強制対流時における感温磁性マイクロカプセル分散液の流動場の可視化

抄録

In this study, the effect of the flow by the force of temperature-sensitive magnetic microcapsules caused when supplied magnetic field investigated. The multifunctional working fluid used this experiment was the water contained temperature-sensitive magnetic fluid were microencapsulated. The temperature-sensitive magnetic microcapsules containing the temperature-sensitive ferrofluid and fluorescent dye were created by the in-liquid drying method. The temperature-sensitive magnetic microcapsule dispersion flowed through a flow path to which a magnetic field was supplied by a syringe pump. A microscope and a CMOS camera were used for observation, and particle images were taken. The velocity was calculated with PIV software using the captured image and the velocity field was visualized. The effect of temperature-sensitive magnetic microcapsules on forced convection was observed when a magnetic field was applied. Clusters were observed to form on the walls and be attracted to the direction of the strong magnetic field, facilitating the flow. By changing the position where the magnetic field is applied, there was a tendency for the flow promotion to weaken. Also, increasing the temperature of the channel decreased the effect of the magnetic field on the flow. This response to temperature is due to the decrease in magnetization with temperature that is characteristic of thermosensitive magnetic fluids. This suggests the possibility that temperature-sensitive magnetic microcapsules can promote heat transport in the same way as temperature-sensitive magnetic fluids.