The pressure heads in the first manometer ~Point A ! and in the tee ~Point B! were fixed in respectively 50 and 21.60 m H2O. The suction and discharge valves were manipulated to obtain various discharges in the secondary flows. Further, the primary flow was also fixed for each ejector in view of the fact that at driving pressure heads higher than 40 m H2O, the pressures as well as the driving flows did not change when the valves were adjusted. With a fixed number of 12 experimental data points, efficiency ~h! versus flow ratio ~M! curves were obtained and the head-loss
coefficients in each component of the ejectors were determined by fitting a one-dimensional model.