配管摩擦損失係数:ムーディー線図/Moody chart

PDF Document:Four areas of Moody chart

DateFile NameSize(KB)MD5 Hash
2011/06/1520110615-002.pdf3113f22b7673acad470ac6db5af50e60f5f

Keyword

Smooth pipes,Head loss,Loss coefficient for straight pipe,Length of pipe,Pipe diameter,Reynolds number,Roughness height

Reference

[1]:LEWIS F.MOODY:『Friction Factors for Pipe Flow』,TRANSACITONS OF THE A.S.M.E NOVEMBER,1944
[2]:Brian Nesbitt:『Handbook of Pumps and Pumping: Pumping Manual International』,Elsevier Science,2006,pp.99-100
[3]:Darcy friction factor formulae:WIKIPEDIA
[4]:Institute of Fluid Mechanics and Heat Transfer,Vienna University of Technology:『Pipe flow』

Remarks
ZoneRemarks
Laminar Flow・『Here the flow is fully stabilized under the control of viscous forces whichi damp out turbulence, permitting a completely rational solution』(Reference[1])
・Friction factor(λ) is independent of Roughness.
Critical Zone・『the conditions depend upon the initial turbulence due to such extraneous factors as sudden changes in section, obstructions, or a sharp edged entrance corner prior to the reach of pipe considered and the conditions are probably also affected by pressure waves initiating instability.』(Reference[1])
Transition Zone・This zone extends upward from the perfect smooth pipe line to boundary of the complete turbulence zone(Bule solid or dotted line on graph) and the curves follow the Colebrook-White Equation.
Complete Turbulence Zone・Friction factor (λ) is independent of Reynolds Number(Re) and becomes a constant quantity above the zone.
・Loss coefficient for straight pipe,Friction factor:λ
・Roughness height:ε
・Pipe diameter:d
・Reynolds number:Re