HW_35_Soln - ME 309 Fall 2008 Section 2 Homework # 35 Due...

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ME 309 Fall 2008 Section 2 Homework # 35 Due Monday 1 December 2008 Problem 35-1 Air is throttled from an initial pressure at one-hundred atmospheres to 50 atmospheres by an adiabatic process. The kinetic energy change across the throttle can be neglected. For the initial temperature conditions given below, estimate the temperature on the downstream side of the throttle and the temperature change across the throttle assuming that the change in temperature can be estimated by replacing the Joule Thompson coefficient, h J p T = μ on the upstream side of the valve by the linear relation: J downstream upstream downstream upstream p p T T - - on a line of constant enthalpy. Note that this is a rough approximation, but gives an indication of the type of temperature change that can be expected in a throttling process. Note that for a perfect gas, the Joule-Thompson coefficient is zero and for reference, the compressibility coefficient is given. A perfect gas has a compressibility coefficient of unity and a Joule-Thompson coefficient of zero. The Joule-Thompson coefficient for air in this range changes from positive to negative, indicating both heating and cooling. Temperature
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This note was uploaded on 03/09/2010 for the course ME 309 taught by Professor Merkle during the Spring '08 term at Purdue University-West Lafayette.

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HW_35_Soln - ME 309 Fall 2008 Section 2 Homework # 35 Due...

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