Abstract
A study of direct-heat-to-power energy conversion device, using temperature-sensitive magnetic fluid, was conducted. Numerial simulation was carried out in order to obtain fundamental characteristics of the device. The working principle of the device is based on the thermo-magnetic effect of magnetic fluid, in which the driving force (the driving pressure) needed to circulate magnetic fluid in the thermodynamical power cycle can be derived from the magnetization difference in a temperature field. When a magnetic field is imposed on the rectangle box in which a magnetic fluid is enclosed, a magnetic fluid is made to circulate so that a rotation disc inside the rectangle box is rotated by the friction of the fluid flow. Magnetic fluid is modeled by Rosensweig equation and its magnetization is calculated with Langivin type equation. results of numerical analysis showed various aspects of the device, indicating that the device is feasible as thought by the theory (power generating thermo dynamical system). Optimization of the device is also considered to gain sufficient shaft output and the efficiecy. It is concluded that further development of the device is possible with different structure of the device as well as the direction of imposing magnetic field.
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