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Minor Losses in Pipe Systems

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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
5. Gradual expansions or contractions
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 )
hm is minor head losses
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
5. Gradual expansions or contractions
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 )
hm is minor head losses
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:


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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