Major head losses pressure drop

The major head losse or pressure drop represent energy losses due to friction of the fluid in a conduit of constant section. They are expressed in fluid heights (in meters) and pascals.

DH is the pressure drop of major head loss in meter column fluid

l is the major head loss coefficient

pressure drop of major head losses

V is the average flow velocity
D is the diameter of the flow
L is the length of the flow (pipe length)
g is graity (9.81)

Here is an example of how to calculate major head loss with software mecaflux:

To calculate the energy losses, certain information is required, enter the information in the "Parameters area"

Pipe diameter (or equivalent diameter if the cross section is not round) mm.
Flow in the selected unit.
Length of the pipe in meters
Select a fluid And in the viscosity chart , select a température
Select a pipe material

Press calculate.. (if a required parameter is missing a message "insufficient parameters will warn) During the calculation:

You may be offered a choice of two equations, the results are similar, but you can compare different methods of calculation.
You may be offered a choice between two flow regimes when you are close to the limits of transition between laminar and turbulent flow.. This transition is often brought into reality by defects in roughness. (if you restart the calculation by slightly modifying the roughness you switch to a regime or another)

Calculation results are displayed in the software's results area":

the pressure drops are given in fluid heights (in meters) and pascals.
the section of the conduit in m²
the average fluid velocity in ms
the maximum flow velocity in ms
the coefficient of head loss (dimensionless coefficient )
flow type
Equation used
Reynolds number

The inventory of head loss, allows you to add the results of several calculations, perform test debits, research points operating pumps and graphical analysis: See inventory pressure drop

CALCUL DES PERTES DE CHARGE REGULIERES

The pressure in one point of the network is the sum of energies of dynamic and static pressures These transformations of energy are reversible or irreversible

the pressure drops and head losses are irreversible loss of pressure because the head loss is converted into heat or noise that we do not know re-transformed into pressure.

The pressure generated by changing altitude or height of load (hydrostatic pressure) is reversible: If the duct up of 1 meter, and down of 1 meter, the balance is zero:

the pressure generated by the change in velocity (dynamic pressure) is reversible:If for a given flow a converging cone accelerates the fluid the pressure decreases (see Bernoulli), but if another diverging cone, positioned downstream, slows down the fluid to its original speed, the balance of dynamic pressure is zero:

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Major head loss pressure drop