Mutual Similarity in Laminar Pipe Flows with Secondary Flows. Curved Pipe and Orthogonally Rotating Pipe.

Similarity between the fully developed laminar flows in a curved pipe and an orthogonally rotating pipe is discussed. Two nondimensional parameters are obtained properly for each flow. When the second parameters become large, it is shown that friction factors for these two flows are in accord with each other and flow characteristics become very similar.