It was assumed that the jet influences the suction flow only at the throat entrance, that the mixing flow was one-dimensional, the pressure was constant at the throat entrance and exit, that the average throat velocity was constant and equal to the velocity at the diffuser entrance, and that the primary and secondary fluids were of the same density, incompressible, and were at the same temperature.
The terms Kn , Ks , Kt , and Kd respectively correspond to the head-loss coefficients in the driving nozzle entrance, suction
chamber, throat, and diffuser. Whereas the coefficient Ks depends on the geometry of the suction chamber, Kn , Kt , and Kd can be expressed in the following forms: