感温磁性流体を用いた小型熱輸送機器に関する研究(熱工学,内燃機関,動力など)

概要

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In the present paper, experimental studies were performed on a mini-heat transport device incorporating a thermosensitive magnetic fluid. Heat transport systems using magnetic fluids have already been proposed by several researchers, but micro-sized devices of this type have not yet been developed. The device under discussion is made of a Teflon tube of 2mm inner diameter and is formed in the shape of a loop. The operation of the device is based on the thermo-magnetic characteristics of the fluid, a suspension of Mn-Zn ferrite particles in kerosence, the magnetization of which is known to decrease with increasing temperature. The experimental parameters were magnetic force, the position of the magnet, and the temperature of the magnetic fluid. It was found that the velocity of the thermosensitive fluid could be controlled by changing the magnetic force and the position of the magnet. When there is a temperature difference in the magnetic fluid, the fluid flows automatically in the direction that reduces the non-equilibrium of the magnetic force. Furthermore, it was found that the maximum velocity of the thermosensitive magnetic fluid, without the use of a pump, was about 20mm/s.
2006-11-25