Calculation of Head Loss at Bend Entry.

Keyword

Head Loss at Bend Entry,Diameter,Radius of curvature,Mean velocity,Angle of Bend,Reynolds number.

Reference

・『機械工学便覧 基礎編 A5 流体工学』(日本機械学会編).

Remarks

・Re(d/p)2<364:ζb=0.00515*α*θ*Re-0.2*(p/d)0.9.
・Re(d/p)2>364:ζb=0.00431*α*θ*Re-0.17*(p/d)0.84.
・θ=45° :α=1+5.13*(p/d)-1.47.
・θ=90° :α=0.95+4.42*(p/d)-1.96.※p/d<9.85.
     :α=1.0※p/d>9.85.
・θ=180°:α=1+5.06*(p/d)-4.52.
・Head Loss=ζb*v2/(2*g).

History

・2009/06/09:Upload.