Desing of Energy-Efficient Pipe-Size Expansion
Publication: Journal of Irrigation and Drainage Engineering
Volume 109, Issue 1
Abstract
Fluid flow is analyzed through a two‐stage conical diffuser used to reduce the velocity of pipe flow. An analytical approach is described for determining the optimum diameter at the interface between the first stage, a conical diffuser, and the second stage, an abrupt enlargement, such that, for given approach and exit diameters and for a given diffuser length, the energy loss coefficient is the lowest possible. Over a practical range of diameter and length ratios (ratios of exit diameter and diffuser length, respectively, to approach diameter), the analysis demonstrates that the optimal internal planar angle varies from to (0.101 rad–0.300 rad), and the energy loss coefficient to be applied to the approach velocity head varies from 0.01–0.25. The energy loss coefficients for the optimally designed two‐stage conical diffuser are considerably less than for a single‐stage diffuser and for an abrupt enlargement. Equations are presented showing the interrelationship among coefficients used variously to express energy loss in a pipe‐diameter expansion as a function of approach and exit velocities.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 109 • Issue 1 • March 1983
Pages: 13 - 28
Copyright
Copyright © 1983 ASCE.
History
Published online: Mar 1, 1983
Published in print: Mar 1983
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