NUMERICAL ANALYSIS OF SPECIFIC FRICTION FOR RECTANGULAR PIPES

The basic theory and engineering application of the undergraduate textbook of Engineering Fluid Mechanics are applicable to circular pipelines, while for the calculation of non-circular pipelines, the equivalent diameter method is mentioned in the textbook, which considers that the resistance of non-circular pipelines is similar to that of circular pipelines with the same equivalent diameter, so that non-circular pipelines are calculated according to circular pipelines. But the resistances of circular pipelines with the same equivalent diameter and non-circular pipelines behave very differently under different conditions. Therefore, this paper uses numerical calculation method to analyze the factors affecting the specific friction of rectangular section pipelines, and provides a basis for the resistance calculation of special-shaped pipelines.