Surface Profile Control And Anti-Drag Property Of Three-Dimensionally Self-Assembly

Along with the development of energy-saving society, pipeline undercoat drag reduction technology becomes more widespread concern. This paper take the mechanism of bionic nonsmooth pits surface drag reduction as basis and get a kind of large ceramic polymer particles nonsmooth pits self-assembly coating in the way of macromolecules self-assembly. And the anti-drag property is tested in the self-restraint differential pressure experiment table.The traditional indentation nonsmooth surface processing production has many disadvantages such as the cost is high, processing base material has limitations and the working area is very narrow. Commensurate with that, in this paper, macromolecules self-assembly is simple and convenient. First, the intercalation kaolin is made into different size ceramic polymer particles by way of graph-gelling. And then, using the polyurethane-epoxy(IPN) as assembling varnish, put the different size ceramic polymer particles into the varnish together with the accessory ingredient. In the purpose of controlling the surface feature of the coating, it changes the size and the content of the ceramic polymer particles into six groups. At last, it find that distribution coefficient of pits due to the reason of the content of the ceramic polymer particles, and the size of it leads to the change of the size of pits. As the view, the surface of the self-assembly coating with the size(10±0.5μm) and the content(10%) coincides with the ideal model.With the study of former technical information, a improved drag-reduction test table is made in this paper. The basic theory is differential pressure experiment, in which tne anti-drag efficiency is remarked by the difference of the pressure between the two end of the testing pipeline. The material, processing method and the pressure sensor are all different with formers. To avoid the waste of material, it use rectangular groove 64# channels for the main body parts, and at the same time both ends link with bigger size steel tube in order to avoid local turbulent flow of fluid pressure effects. In order to avoid the accumulated error, one pressure sensor with large span and high-precision, and one differential pressure transducer with small span and high-precision, are used to test the pressure. The experimental data is collected and analysed by pressure sensor supporting data acquisition software.The anti-drag property of different coatings, such as no coating smooth steel inwall, normal coatings and large ceramic polymer particles nonsmooth pits self-assembly coating, is tested in the last of the paper. According to the comparison, the best pits nonsmooth surface is analysed and corresponding size and content of the ceramic polymer particles. So it gives some theory and experiment experience about the using of large self-assembly in making functionality coatings.