Abstract
Numerical investigations of laminar flow in the entrance region of a straight pipe developing from fully developed laminar flow in a helical pipe are presented. The flow development is investigated in a modified Dean number range of 1 to 400. The results show that the development of the average friction ratio with length is not significantly affected by the dimensionless pitch or curvature ratio at the same modified Dean number. However, the average friction ratio develops differently at different Reynolds numbers, even at the same modified Dean number. New correlations are proposed for the development of the average friction ratio and for the fully developed length. These correlations can be used to estimate the developing flow in straight pipes connected to helical pipes of various shapes under various flow conditions at modified Dean numbers between 1 and 400.
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