A jet-ejector pump, shown schematically in Fig. P7.172, is
Chapter 7, Problem 172HP(choose chapter or problem)
Problem 172HP
A jet-ejector pump, shown schematically in Fig. P7.172, is a device in which a low-pressure (secondary) fluid is compressed by entrainment in a high-velocity (primary) fluid stream. The compression results from the deceleration in a diffuser. For purposes of analysis, this can be considered as equivalent to the turbine-compressor unit shown in Fig. P7.165 with the states 1, 3, and 5 corresponding to those in Fig. P7.172. Consider a steam jet pump with state 1 as saturated vapor at 35 kPa; state 3 is 300 kPa, 150° C; and the discharge pressure, P5, is 100 kPa.
a. Calculate the ideal mass flow ratio, m1/m3.
b. The efficiency of a jet pump is defined as η = (m1/m3)actual / (m1/m3)ideal for the same inlet conditions and discharge pressure. Determine the discharge temperature of the jet pump if its efficiency is 10%.
FIGURE P7.172
FIGURE P7.165
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