Experimental Study On Heat Transfer Characteristics Of Nano Fluid Heat Pipe

With the rapid development of technology, ordinary working fluid heat pipe has been unable to meet cooling requirements of the miniature, integrated and high heat flux density of electronic components, the research of nanofluid heat pipe has obtained more and more attention, which has gradually become the hot spot in the research of heat transfer at home and abroad. The nanofluid preparation method and nanofluid heat pipe research theory were summarized by consulting a large number of domestic and foreign literatures in this paper. Al2O3-H2 O nanofluid was prepared by adding Al2O3 nanoparticles to deionized water. Fill the nanofluid into the heat pipe casing and study on micro-channel flat heat pipe of Al2O3-H2 O by experiments.First, Al2O3-H2 O nanofluid whose volume share are 0.5%, 1%, 1.5% and 2% were prepared by two-step processes. The particle suspension stability of nanofluid was evaluated by suspension stability of nanofluid characterization method. The experiments show that the dispersing technique to add Al2O3 nanoparticles to deionized water is two hours ultrasonic vibration.The production technique of heat pipe was introduced in this paper. Wire cutting technology was used to machining micro- rectangular channel flat heat pipe. The Al2O3- H2 O nanofluid was filled into tube with the working fluid filling device. Heat transfer performances in different conditions were tested by heat pipe heat transfer performance laboratory apparatus.The paper study that the heat transfer performance of nanofluid micro-channel flat heat pipe is best when filling rate is 20% and volume share is 1.5%. Under the same condition, the thermal conductivity of Al2O3- H2 O nanofluid heat pipe is increased by15.6% than deionized water; thermal conductivity is increased by 26.4% when heat pipe placed vertically than horizontally. The heat transfer performance of the nanofluid micro-channel flat heat pipe will achieve the optimal when the volume share of nanoparticles is the best. Nanofluid is a new kind of heat transfer working fluid which is suitable for micro-channel flat heat pipe, and it has a good application prospect and development potential in strengthening heat transfer of micro-channel flat heat pipe.