Calculating Flow in Manifold and Orifice System
Spatial distribution of water discharge can be obtained through a manifold consisting of main pipes and perforated laterals. This study formulates the problem of discharge distribution among lateral pipes and from laterals through orifices uniformly spaced along them. A nonlinear difference equation...
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Published in: | Journal of environmental engineering (New York, N.Y.) Vol. 118; no. 4; pp. 585 - 596 |
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Main Authors: | , |
Format: | Journal Article |
Language: | English |
Published: |
Reston, VA
American Society of Civil Engineers
01-07-1992
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Subjects: | |
Online Access: | Get full text |
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Summary: | Spatial distribution of water discharge can be obtained through a manifold consisting of main pipes and perforated laterals. This study formulates the problem of discharge distribution among lateral pipes and from laterals through orifices uniformly spaced along them. A nonlinear difference equation for flow in the pipes is solved numerically to determine the driving head as a function of the number of ports and a geometrical ratio. A dimensionless solution for simple manifolds is developed to obtain a direct method of evaluating discharges through all the orifices. The approach presented in this paper makes it possible to formulate the problem of restricting the maximum outlet-discharge variation through a dividing-flow manifold. A graphical solution to this problem is obtained that permits one to indicate the lateral-to-manifold diameter ratio for limiting this variation to a prescribed value. The results of this paper offer a means for comparing the uniformity of distribution expected from various combinations of the number of orifices and laterals and their sizes for a given manifold. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0733-9372 1943-7870 |
DOI: | 10.1061/(ASCE)0733-9372(1992)118:4(585) |