424 Chapter Four Eductors

Design The elements of an eductor design are shown in Figure 1. Quantities involved are defined as follows:

P1 = static pressure upstream, lb/ft2 (N/m2)

Ps = static pressure at suction (nozzle tip), lb/ft2 (N/m2)

g1 = specific weight (force) of motive fluid, lb/ft3 (N/m3)

Ps = static pressure at suction, lb/ft2 (N/m2)

P2 = static pressure at discharge, lb/ft2 (N/m2)

g2 = specific weight (force) of mixed fluids, lb/ft3 (N/m3)

The head ratio RH is defined as the ratio of the operating head to the discharge head:

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