Before revision: In this expression, the properties of the fluid itself are reduced to the kinematic viscosity ν where μ = viscosity of the fluid (SI kg / m / s) Friction loss in straight pipe The friction loss in uniform, straight sections of pipe, known as "major loss", is caused by the effects of viscosity, the movement of fluid molecules against each other or against the (possibly rough) wall of the pipe.
After revision: In this expression, the properties of the fluid itself are reduced to the kinematic viscosity ν where μ = viscosity of the fluid (SI kg • m / s) Friction loss in straight pipe The friction loss in uniform, straight sections of pipe, known as "major loss", is caused by the effects of viscosity, the movement of fluid molecules against each other or against the (possibly rough) wall of the pipe.