L18_Nonideal_Gases - Material and Energy Balances...

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CAB1064 – Material and Energy Balances 1 Material and Energy Balances 10/13/11 Single-Phase Systems Non-ideal gases
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CAB1064 – Material and Energy Balances 2 Material and Energy Balances 10/13/11 Objectives At the end of this chapter, you should be able to understand the following : Critical temperature and pressure The compressibility factor EoS Equations of state for non-ideal gases
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CAB1064 – Material and Energy Balances 3 Material and Energy Balances 10/13/11 Introduction The ideal gas is the basis of the simplest and most convenient EoS Its shortcoming is that it can be seriously inaccurate At a sufficiently low temperature and/or sufficiently high pressure, a value of specific molar volume predicted with the ideal gas equation can be highly inaccurate The level of inaccuracy differs for different species Several more complex but more accurate EoS for single species and for gas mixtures will be dealt with in this lecture.
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CAB1064 – Material and Energy Balances 4 Material and Energy Balances 10/13/11 Critical State Early experiments found that at the critical point all substances are in approximately the same state of molecular dispersion Consequently, their thermodynamic and physical properties should be similar The law of corresponding states expresses the idea that in the critical state all substances should behave alike.
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CAB1064 – Material and Energy Balances 5 Material and Energy Balances 10/13/11 Critical State The critical state for the gas-liquid transition is the set of physical conditions at which the density and other properties of the liquid and vapor become identical. The highest temperature at which a species can
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L18_Nonideal_Gases - Material and Energy Balances...

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