Synthesis Of Copper Oxide Nanofluid And Its Application In Heat Pipes

The energy transfer process and application technology of nanofluid is an important part for the application of nanotechnology. Through a long time for the study of nano fluid, we find an effective way of improving the thermal conductivity of fluids is to suspend small nano solid particles in the carrier fluids in order to change transport properties, flow and heat transfer features of liquids. Due to the small size of nano particles, nanofluid does not clog flow channels,erode pipelines and cause severe pressure drops.This study aims at prepared a new copper oxide / water nanofluid have excellent heat transfer performance,then apply it to the field of heat transfer and to further expand the nanotechnology application in actual production, then explore the existence problem of nanotechnology in the field of heat energy engineering, finally further development of high efficiency and low resistance compact heat exchange equipment in the future.The main research work of this paper is as follows:(1) Synthesized six kinds of copper oxide nanoparticles with different morphologies by hydrothermal method and co precipitation method, the morphology of nano particles were urchinlike, straw-like, silkworm-like, rice-like, flower,-like, flower ring-like. In the course of study, we select different reation reagents and use different synthetic methods in the optimum reaction conditions by controlling the impact factors such as pH of reaction solution, temperature, reaction time, finally synthesized different morphologies of CuO nanoparticles.(2) By using single- step method and two- step method, we prepared copper oxide / water nanofluid have stability and dispersion of different mass fraction. Then analyzed the effects of preparation methods and particle properties on the suspension stability, thermal conductivity and surface tension. Results show that the stability of nanofluid suspension prepared by single step method is better, and the thermal conductivity is also excellent, the thermal conductivity of nanofluid increased about 12.59%~81.96% contrasted with aqueous phase. The surface tension of rice shaped copper oxide / water nanofluid prepared by two step is the biggest change, the surface tension compared with pure water. is increased by about 1.95%.(3) Encapsulated a core heat pipe with copper oxide / water nano fluid as working substance, built s heat pipe heat transfer enhancement test platform and explored the effect of addition of copper oxide nanoparticles, inclination of the heat pipe and the heating temperature on the heat transfer performance of the heat pipe. Experimental results show that, in the heat pipe, the higher the mass fraction of copper oxide nanoparticles, the smaller the inclination angle of the heat pipe, the higher the heating temperature, the starting temperature of the heat pipe is higher, and the starting time is shorter, indicating that the heat transfer performance of the heat pipe is better.