SpecialProblems16-18

SpecialProblems16-18 - Assume constant specific heat values...

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Special Problems for ME 200 - Spring 2011 Problems Due on February 25, 2011 SP16: Two streams enter an adiabatic, rigid mixing chamber: one stream is water with 90% quality flowing at the rate of 2000 kg/hr and the other is steam at 280 C flowing at the rate of 2790 kg/hr. Mixing occurs at constant pressure of 10 bar and a single stream exits the mixing chamber with velocity of 8.9 m/s. (a) What is the temperature ( C) of the stream leaving the mixing chamber? (b) Calculate the diameter (cm) of the exit pipe. SP17: Air enters the diffuser at 0.7 bar and 57 C with a velocity of 200 m/s. The exit area of the diffuser is 20% greater than the inlet area. Heat loss of 40 kJ/kg occurs from the diffuser to the surroundings and air leaves the diffuser at 1 bar.
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Unformatted text preview: Assume constant specific heat values for air at 27 C. (a) What is the temperature of air ( C) at the diffuser exit? (b) Calculate the velocity of air (m/s) at the diffuser exit. SP18: In a turbojet engine, air enters a poorly-insulated turbine at 4.3 bar and 1320 K and exits at 2.2 bar. The turbine produces 200 kJ/kg of work. Air then enters an adiabatic nozzle and is discharged at 640 K and 0.25 bar with a velocity of 1040 m/s. Neglect velocity change of air through the turbine and consider variable specific heats for air. (a) What is the temperature of air ( C) at the nozzle inlet? (b) Determine the heat transfer (kJ/kg) and its direction for the turbine....
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