磁性流体を用いた磁場制御熱輸送装置に関する研究  [in Japanese] Study for Magnetically Controlled Heat Transport Device Using Magnetic Fluid  [in Japanese]

A magnetically controlled heat transport device, which consists of a concentric pipe and a ring magnet, has been designed and developed. In the present investigation, the basic structure of the device is introduced and the results of heat transporting characteristics, which are obtained from basic experimental device of vertical position, are presented. In order to estimate experimental data one dimentional analysis is carried out, considering the natural convection and the increase of apparent viscosity caused by the magnetic field. Data of the heat transport characteristics show that a relatively high amount of heat can be transported when an appropriate magnetic field, taking in account of the magnetic field distribution, strength of the field and position of the imposition, is applied. However, in some experimental conditions only limit heat can be transported due to the increase of local apparent viscosity, blocking the flow passage and thus reducing the capability of heat transport. The proposed relation obtained from the one dimensional analysis yields reasonable account for estimating the experimental data when thermomagnetic cycle based on the working principle is satisfied.