The local head loss of tee could be calculated with the determination of local resistance coefficient by CFD
simulation and test. Based on the mesh-independent feature identified, the flow field inner tee was numerically simulated
by the standard k - ε turbulent model and SIMPLEC algorithms, which has revealed the mainstream was obliged to turn to
the opposite side of tee junction, and a rise in pressure drop between upstream and downstream was caused as a result.
Furthermore, the frictional resistance coefficient was calculated for eliminating the frictional head loss of model, which
decreased from 0.0207 to 0.0133 when the inlet velocity increased from 1 m/s to 12 m/s. Additionally, the local resistance
coefficients of tee at flow conditions were attained, and the quadratic polynomial between the local resistance coefficient
and flux ratio was presented due to the influence of branch on mainstream. Through the test, the simulation result has been
compared and the effectiveness of simulation has been verified.