Questions from Thermal Fluid Science

Q: Air at 80 kPa, 27°C, and 220 m

Air at 80 kPa, 27°C, and 220 m/s enters a diffuser at a rate of 2.5 kg/s and leaves at 42°C. The exit area of the diffuser is 400 cm2. The air is estimated to lose heat at a rate of 18 kJ/s during thi...

Q: Consider an adiabatic turbine operating steadily. Does the work output of

Consider an adiabatic turbine operating steadily. Does the work output of the turbine have to be equal to the decrease in the energy of the steam flowing through it?

Q: Will the temperature of air rise as it is compressed by an

Will the temperature of air rise as it is compressed by an adiabatic compressor? Why?

Q: Somebody proposes the following system to cool a house in the summer

Somebody proposes the following system to cool a house in the summer: Compress the regular outdoor air, let it cool back to the outdoor temperature, pass it through a turbine, and discharge the cold a...

Q: Consider a device with one inlet and one outlet. If the

Consider a device with one inlet and one outlet. If the volume flow rates at the inlet and at the outlet are the same, is the flow through this device necessarily steady? Why?

Q: Air is expanded from 1000 kPa and 600°C at the

Air is expanded from 1000 kPa and 600°C at the inlet of a steady-flow turbine to 100 kPa and 200°C at the outlet. The inlet area and velocity are 0.1 m2 and 30 m/s, respectively, and the outlet veloci...

Q: Air enters a gas turbine at 150 psia and 700°F

Air enters a gas turbine at 150 psia and 700°F and leaves at 15 psia and 100°F. Determine the inlet and outlet volume flow rates when the mass flow rate through this turbine is 5 lbm/s.

Q: Refrigerant-134a enters a compressor at 180 kPa as a saturated

Refrigerant-134a enters a compressor at 180 kPa as a saturated vapor with a flow rate of 0.35 m3/min and leaves at 900 kPa. The power supplied to the refrigerant during the compression process is 2.35...

Q: Steam flows steadily through an adiabatic turbine. The inlet conditions of

Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 4 MPa, 500°C, and 80 m/s, and the exit conditions are 30 kPa, 92 percent quality, and 50 m/s. The ma...

Q: Consider a U-tube whose arms are open to the atmosphere

Consider a U-tube whose arms are open to the atmosphere. Now water is poured into the U-tube from one arm, and light oil (ρ = 790 kg/m3) from the other. One arm contains 70-cm-high water, w...