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HW_35_Soln

# 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 μ - - 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.

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

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