The flow rate 〖(Q〗_1) at the pipe inlet was maintained constant at 1.2 l/min (2 × 〖10〗^(-5) m^3/s) and measured by KAT meter at the inlet of the pipe whose diameter is (D = 1.27 cm). The velocity V1 at the pipe inlet is determined as equal to Q1/A, where A is the cross sectional area of the pipe. Assuming the diameter (d) of each nozzle is the same and equal to 3 mm, the flow rate is (Q_1/16) per nozzle, provided that the number of nozzles is 16. The velocity at each nozzle is v_n=(Q_1/16)/A_n, where A_n is the cross sectional area of nozzle.