Question 5.9: Consider a diffuser as shown in Figure 5.11a with inlet and ...
Consider a diffuser as shown in Figure 5.11a with inlet and exit pressures of90 and 94 kPa, respectively. The inlet air temperature, the entrance area and the inlet air velocity are 10 °C, 6.4 m^2 and 94 m/s. Treat air as an ideal gas and use its properties. (a) Write the mass, energy, entropy, and exergy balance equations, (b) find the mass flow rate and exit temperature of the air leaving the diffuser, and (c) calculate the entropy generationrate and exergy destruction rate.
In addition, there is a nozzle, as shown in Figure 5.11b, with helium flowing through an entrance area of 0.6 m^2 at a velocity and temperature of 24 m/s and 25 °C. The exit area is measured to be 0.1 m^2 and the pressure is measured to be 90 kPa. The exit density is given as 0.142 kg/m^3. (a) Write the mass, energy, entropy, and exergy balance equations, (b) find the mass flow rate and exit velocity of helium, and (c) calculate the entropy generation rate and exergy destruction rate. Both of these units can be treated as adiabatic devices.
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