Unformatted text preview: small because of the low density. | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.7 Minor Losses in Pipe Systems 6.7 Minor Losses in Pipe
Systems7 367 For any pipe system, in addition to the Moody-type friction loss computed for the length
of pipe, there are additional so-called minor losses due to
5. Pipe entrance or exit
Sudden expansion or contraction
Bends, elbows, tees, and other fittings
Valves, open or partially closed
Gradual expansions or contractions The losses may not be so minor; e.g., a partially closed valve can cause a greater pressure drop than a long pipe.
Since the flow pattern in fittings and valves is quite complex, the theory is very
weak. The losses are commonly measured experimentally and correlated with the pipeflow parameters. The data, especially for valves, are somewhat dependent upon the particular manufacturer’s design, so that the values listed here must be taken as average
design estimates [15, 16, 35, 43, 46].
The measured minor loss is usually g...
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- Spring '08
- Fluid Dynamics, e-Text Main Menu, Osborne Reynolds