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# Minor Losses in Pipe Systems

الكلية كلية الهندسة/المسيب     القسم هندسة الطاقة     المرحلة 2
أستاذ المادة سناء عبد الرزاق جاسم       22/04/2017 10:20:18
Minor Losses in Pipe Systems
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:
1. Pipe entrance or exit
2. Sudden expansion or contraction
3. Bends, elbows, tees, and other fittings
4. Valves, open or partially closed
The measured minor loss is usually given as a ratio of the head loss
hm= ?p/(?g) through the device to the velocity head V2/(2g) of the associated piping system.

Loss coefficient K=hm/(V^2/2g)=(?p/?g)/(V^2/2g)=?p/(1/2 ?V^2 )
K is a dimensionless factor.

The minor losses could be written on another way:
the minor loss as if it were an equivalent length Leq of pipe, satisfying the Darcy friction-factor relation:
Minor Losses in Pipe Systems
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:
1. Pipe entrance or exit
2. Sudden expansion or contraction
3. Bends, elbows, tees, and other fittings
4. Valves, open or partially closed