Hey guys!!!!!!: Friction Head loss

Friction Head Loss estimation using Hagen-Poiseuille and Darcy-Weisbach equation..

Friction Head Loss can be estimate using this two formula:

Hagen-Poiseuille formula:for Laminar Flow...

-In fluid dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the pressure drop in a fluid flowing through a long cylindrical pipe.

-The assumptions of the equation are that the fluid is incompressible and Newtonian; the flow is laminar through a pipe of constant circular cross-section that is substantially longer than its diameter; and there is no acceleration of fluid in the pipe. For velocities and pipe diameters above a threshold, actual fluid flow is not laminar but turbulent, leading to larger pressure drops than calculated by the Hagen–Poiseuille equation.

Formula Darcy-Weisbach : for Turbulent Flow....

-In fluid dynamics, the Darcy–Weisbach equation is a phenomenological equation, which relates the head loss — or pressure loss — due to friction along a given length of pipe to the average velocity of the fluid flow.

-The Darcy–Weisbach equation contains a dimensionless friction factor, known as the Darcy friction factor.

In Laminar Flow:
-relative roughness is not significant friction but depend on viscosity.
-friction factor can be calculated using formula above.

In Turbulent Flow:
-relative roughness contribute a significant part besides Reynolds No.
-can be calculated using:

SMOOTH PIPES FLOW...

(I) Colebrook