Relations between the Characteristics of Pipeline Internal Surface and the Friction of Fluid(2)

By adopting the comparing tests of small diameter pipings in laboratory, the author has proved that the charact eristics of pipeline internal surface has influence on the frictiin of fluid and that the pipe wall has different characteristics of fluid edging coating under the conditions of adhesive fluid or non-adhesive fluid. The paper briefly introduces the whole process of five comparing tests and the results of these tests.