The Materials Self-healing Principle Experiment And Flow Characteristics Investigation

In the using of materials (such as polymer materials, concrete, etc.), kinds of injury which is sometimes difficult to repair or too costly to repair may appear in the surface and interior, which will shorten the life of the materials. Self-healing technology can be used to improve material reliability and extend the service life. It means that the emergence of the material damage (such as micro-cracks) can automatically repair itself without the need for human intervention or only with very little intervention of human.Firstly, the principle of pressure-driven self-repairing material working process is analyzed in this article. Experimental device which can simulate the generation of cracks and filling process of repair agent is established. Experimental tests with different kinds of conditions are carried out. Experimental results show that, repairing agent can be smoothly filled into the fissures and maintained on the fractured surface; the process of pressure-driven materials self-repairing process is feasible in principle.Secondly, the flow resistance of power law fluid which flow in the networks has been researched through the analysis and numerical simulation. The results show that, when the fluid flows steadily in the networks from the center (the thick-thick point) to the around, the resistance of two-scale flow is less than the uniform-scale flow. For shear thickening fluids, the advantages of two-scale flow is more obvious. Unstable emission or filling in network channels, when the discharge point is thick-thick point, two-scale flow channel is superior to uniform scale. When the discharge point is thick-thin point, two-scale flow channel is superior to uniform scale. When discharge point is thin-thin point, uniform-scale flow is superior to two-scale flow.Third, the experimental device of a two-scale micro-channel flow resistance characteristic is established. Flow resistance with a typical condition is measured. The changing trend of flow in symmetrical exports is much the same with different pressure.Finally, the heat transfer characteristic of power law fluid which flows in the networks has been researched with numerical simulation. The results show that, power consumption has many critical values. When the power consumption is greater than the critical value, with the increase of power consumption, the increase in the heat transfer of two-scale flow is greater than the uniform flow with the same power consumption.