Study And Application On Drag-Reduction Characteristic Of Internal Coatings On Product Pipeline

At present the product pipeline is rapidly developing in China. This paper focus on studying the drag-reduction characteristic of epoxy coatings on the product pipeline, and investigate the law of coating drag-reduction in the product oil. Indepently design and establish a set of evaluation circular pipeline device base on the differential pressure fluid resistance measuring principle. Practise shows that the device has good repeatability and comparability. Experimently prepare epoxy resin-based coatings of different surface properties by adding low suface energy filler. Use indirect and direct method respectively to evaluate the drag reduction effect of epoxy coatings on three kind of product oil. The results indicate that the epoxy coating showed different degrees of drag reduction effect on all kind of product oil. When the Reynolds number is 3475, the maximum drag-reduction rate of 3% PTFE coatings is up to 23.1%, as the fluid medium is recombined oil of 5.0mPa·s viscosity(30℃). The drag-reduction effect of coatings is in relation to oil viscosity and surface energy of coating. In the same Reynolds number, the greater oil viscosity and the lower coating surface tension, the drag-reduction effect of coatings is better. Modeling and experimental design by using of dimensional analysis, this paper theoretical derived the empirical expression of skin friction of pipeline inner coated with resin coating according to experiment results. In order to optimize drag reduction property of the coating, this study employ orthogonal method to design the drag-reduction coating formulations for product pipeline, and obtain the optimum coating formulations in the end.