The liquid flow in the relevant pipe.
The actual inside diameter of the pipe.
Specifies how quickly a liquid spreads relative to its mass if it is poured out on a flat surface. In the original case, set to air at 20˚C.
Are proportionality factor for the force it takes to parallel displace a surface relative to another, if the gap between these surfaces is filled with a viscous liquid or gas.
Density or volume of the mass is an SI unit and is a measure of a specific substance density, ie mass per unit volume. A synonym for density that can sometimes occur is specific gravity.
Pipe pressure drop corresponds to the force required to move the medium in the relevant pipe of 1 meter.
The velocity of the medium in the tube.
A material constant that indicates how smooth tube material is.