These limits were applied on the basis of the values of Cd , f, and hd obtained from Engel ~1963!, Mueller ~1964!, and Silvester and Mueller ~1968!. As the type B ejectors were without throat, Kt50 and their efficiency was lower. Hence, the limits of Kn and Kd considered for these ejectors corresponded to smaller values of Cd and hd . In both cases, a lower bound for Ks of 0.90 was the loss in the suction chamber, whereas it was larger than the loss in
a 90° PVC elbow. The variable c in the sum of squared deviations in Eq. ~9! corresponded to the number of experimental points in which the flow entered the cavitation regime. These points were considered to be in the region in which efficiency suffers a sudden decline and which is characterized by typical cavitation phenomenon
noises. To evaluate the level of adjustment of the theoretical curves, the coefficient of determination r2 was calculated by the following equation: