The flow of a viscous liquid provokes, by friction, the degradation of the mechanical energy in the form of HEAT. This degradation is expressed by a pressure variation ∆P (or a fluid height variation ∆H). ∆P or ∆H are called pressure losses.
Singular pressure losses are those induced by piping such as valves, elbows, reductions and other in-line equipment… in which the average Speed Vector varies in size and direction.
Note :
Pressure losses, being in line or singular, are born from the flow and disappear when the flow is cancelled. Coefficients will thus be used to characterize the relation between the pressure loss of a valve or a network and the fluid flow which goes through them in stabilized mode.
