The theoretical maximum ideal pumping efficiency of a water jet pump is 50% at a flow ratio of unity. Pump performance can be predicted theoretically. With a pump designed with theoretically obtained optimum dimensions, a maximum efficiency of 39.8% was achieved. Efficiencies on the order of 42% could be obtained by selecting proper materials to reduce friction losses to a minimum. If a jet pump with fixed nozzle is constructed for maximum efficiency, the area ratio should be between 0.33 to 0.543; for adjustable nozzle pumps, the area ratio should be about 0.205, and the pump should be operated at a nozzle distance of one to two nozzle diameters.
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Reddy et al. (1968) studied this question.