This topic is generally deals with investigation of head loss (pressure loss) and flow rate suffered by the flow after
passing through T-junction and to study the accuracy of classical engineering formulas used to find head loss for T-junction of
pipes. In this topic we have compared our results with software packages with classical formula. In this work we have studies
head loss in T-junction of pipes with different inlet injectary angles and different inlet velocities, head loss in T-junction of pipes
when the angle of the junction is slightly different from 90 degrees and T-junction with different radius of curvature of branches
in junction. One of the important purposes of this study is study the change in pressure loss with change in angle of T-junction
