To model and embed a junction and separation (tee or y fittings) in a branch portion of a network of fluid, Mecaflux standard provides a simplified method to cover all the cases encountered.

head loss calculation in junction and separation (tee or y fittings) in fluids networks , can be useful if you want to compare the pressure drop of two branch portions of a network. (Reminder: The flow in each branch / segment of an separation of stream, meet the condition of equal pressure drop in each downstream branch, together with the condition : total of the downstream flows = flow upstream. If two conditions are met we solved the flow of each branch)

• If you frequently need to modelize branched networks mecaflux "pro 3D Networks" is better suited.

Start by recalling that a segment has a given flow rate which remains constant throughout its length. If there is a flow rate change (separation or junction of flows), there is change of segment. This implies that a connection must only be in the first or last position of a segment...

7 objects fittings are available in the tab "elements pressure losses", under the category "fittings":

 Junction 135° (plus or minus 20 degrees) output 135° (plus or minus 20 degrees) input ou output 45° (plus or minus 20 degrees) Passage 135 ° (plus or minus 20 degrees) Passage 45° (plus or minus 20 degrees) input ou output 90° (plus or minus 20 degrees) Passage 90° (plus or minus 20 degrees)

Combinations of these 7 connections objects facility allows to model all 14 situations, separation and reunions fluid stream, gas or liquid:

 reunions fluid stream Separations fluid stream 1: Junction 135° + Passage 135 ° (fittings placed at the end of segment) 2: Junction 135° + Junction or output 45 (fittings placed at the beginning of segment) = + = + 3: output 135° + Junction or output 45° (fittings placed at the end of segment) 4: output 135° + Passage 135 °(fittings placed at the beginning of segment) = + = + 5: Junction or output45 + Passage 135 ° (fittings placed at the end of segment) 6: Junction or output 45 + Passage 135 °(fittings placed at the beginning of segment) = + = + 7:Junction 135° +Junction 135° (fittings placed at the end of segment 8: output 135° +output 135°(fittings placed at the beginning of segment = + = + 9: Junction or output 45 + Junction or output 45 (fittings placed at the end of segment) 10: Junction or output 45 + Jonction or output 45 (fittings placed at the beginning of segment) = + = + 11: Junction or output 90° + Passage 90° (fittings placed at the end of segment) 12: Junction or output 90° + Passage 90°(fittings placed at the beginning of segment) = + = + 13 : Junction or output 90° + Junction or output 90° (fittings placed at the end of segment) 14: Junction or output 90° + Junction or output 90° (fittings placed at the beginning of segment) = + = +

Modeling fittings is subject to three rules that evaluate all the cases encountered Exemple:

In reality the connection may have different diameters, to model these cases, insert cones, narrowing or widening to reduce the diameter to the fitting's size.

Rule 1: 3 branches in direct contact with the fitting must have the same diameter.

Rule 2: The flow separation are always placed at the beginning of a section, the flow rate calculation is that of the section

If you follow these basic rules, calculations of pressure losses connecting sections, of all situations encountered is possible