mech3020-s11-hw10 - (a Assuming constant specific heats at...

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MECH 3020 Thermodynamics II: Homework Set 10 1. A gas mixture consists of 6 parts helium to 2 parts octane vapor on a volumetric basis. The mixture is initially at 300 K, 1 atm. (a) Using tabulated specific heat data, calculate the specific gas constant and mass-based specific heat c P for the mixture. (b) Say the mixture is compressed adiabatically and reversibly to 5 atm pressure. Assuming constant specific heats, calculate the temperature of the mixture at the end of the compression process. 2. A 0.2 m 3 /s flow of CO 2 at 5 atm, 350 K is adiabatically mixed with a 0.1 m 3 /s flow of N 2 at 500 K, 5 atm pressure. The mixed stream leaves at 5 atm pressure.
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Unformatted text preview: (a) Assuming constant specific heats at room temperature, calculate the exit temperature of the mixed flow. (b) Again assuming constant specific heats, calculate the rate of entropy generation for the mixing process. 3. An inventor claims to have a device which will take 0.1 m 3 /s of air at 300 K, 1 atm, and produce separate streams, each at 300 K and 1 atm, of pure O 2 and N 2 . The device exchanges heat only with the environment and consumes 5 kW of power. Assuming air is 0.21 O 2 , 0.79 N 2 on a mole basis, and taking the environment temperature to be 300 K, determine the validity of this claim. 1...
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