Investigation On Heat Transfer Characteristics Of An Automatic Cooling Device Using Temperature-Sensitive Magnetic Fluid

Temperature-sensitive Magnetic Fluid has the same magnetism and liquidity as the other magnetic fluids. But its special property is that the magnetization largely depends on temperature, so even a very small change of temperature can induce obvious change of magnetization, and accordingly produce a large force on the magnetic fluid to make it flow. The automatic cooling device depends on the thermal and magnetic properties of the magnetic fluid, and uses some temperature-sensitive magnetic fluid, The fluid's Curie temperature should be as lower as possible. It can make the magnetic fluid flow continuously without another pump using only the external thermal and magnetic fields.This paper establishes the macroscopic model of the flow and heat transfer of the temperature-sensitive magnetic fluid in the automatic cooling device. The flow and heat transfer characteristics of the cooling device are investigated theoretically and experimentally. This paper analyzes the magnetic fluid's flow and heat transfer characteristics with or without magnetic field. The effects of volume fraction of magnetic particles, magnetic field strength, magnetic field gradient, power of heating and cooling and the relative position of the heater etc. on the flow and heat transfer characteristics of the automatic cooling device are discussed in detail.