midterm2008SummerB

# midterm2008SummerB - tank’s filling the contents are...

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DREXEL UNIVERSITY MECHANICAL ENGINEERING AND MECHANICS Thermodynamics Analysis II (MEM-410) Midterm 1 take-home – Due 08/15/2008 NAME________________________________________ 1. Methane is to be adiabatically and reversibly compressed from 50 psia and 100 F to 500 psia. Calculate the specific work required for this compression treating methane a) as an ideal gas with variable specific heats b) and using the departure charts. c) compare with ideal gas behavior with constant specific heats 50 psia 100 ° F Methane 500 psia

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2. A mixture of gases is assembled by first filling an evacuated 0.15 m 3 tank with neon until the pressure is 35kPa. Oxygen is added next until the pressure increases to 105kPa. Finally, nitrogen is added until the pressure increases to 140kPa. During each step of the
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Unformatted text preview: tank’s filling, the contents are maintained at 60C. a) Determine the mass of each constituent in the resulting mixture, and the apparent molecular weight of the mixture. A portion of the gas in the tank is placed in a spring loaded piston-cylinder device. The piston diameter and spring are selected for this device such that the volume is 0.1 m 3 when the pressure is 200kPA and 1.0 m 3 when the pressure is 1000kPa (a linear change of the pressure with volume). Initially, the gas is added to this device until the pressure is 200kPA and the temperature is 10C. The device is now heated until the pressure is 500kPA. b) Calculate the total work and heat transfer for this process. Q 25% Ne 50% O 2 25% N 2 (by pressure) 0.1 m 3 10 ° C, 200 kPa...
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## This note was uploaded on 10/27/2008 for the course MEM 410 taught by Professor Husanu during the Summer '08 term at Drexel.

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midterm2008SummerB - tank’s filling the contents are...

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