mech3020-s11-hw10

# 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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