Abstract:

The law of contradiction, the dialectical relationship between the dynamic and the static state, and that between the whole and the part were used to solve the qualitative problems of fluid flow. The problems include the variations of friction loss, static pressure and flowrates in simple and complicated pipelines. The teaching practice showed that solving the above problems by philosophy principles has the characteristics of clear principles, accurate and quick judgement, and could enhance the students' dialectical ability. This method was approved and received by the greater part of the students.

Key words: Dialectical thinking, Law of contradiction, Fluid flow, Qualitative analysis