Investigation of heat transfer characteristics of the self driving temperature-sensitive magnetic fluid through a nonmagnetic porous in a heating pipe

Abstract

A temperature-sensitive magnetic fluid (TSMF) is a functional fluid that can be driven by both a magnetic field and a temperature difference. In this research, non-magnetic porous materials are inserted into a circular pipe to enhance heat transfer and increase the driving force. To evaluate heat transfer performance, measurements are conducted on flow rates and thermal resistance for different lengths and porosity of porous materials. A one-dimensional numerical simulation is employed to compare and predict the heat transfer performance under various porosity conditions also used in this study. As a result, when the porosity of the porous body is 80 % and the length is 10 mm, the flow rate is maximized. This is because the effect of increasing the driving force is stronger than the flow-blocking effect of the porous materials. The numerical results show the same trend as the experiment, and the decrease in flow rate is directly dependent on the length of the porous material.