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Chapter 3 Properties-post

Chapter 3 Properties-post - Chapter 3 Properties of Pure...

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Chapter 3 Properties of Pure Substances Objective: Determine the state (all properties) of a system with a pure substance
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Topics to be discussed Phase-Change of Pure Substances Properties Diagrams for Phase-Change Processes Property Tables Compressed liquid, Saturated Liquid-Vapor Mixture, Superheated vapors Equation of State- Ideal, non-ideal
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A thermodynamic system consisting of a pure substance State Postulate: The state of a system with a pure substance are determined entirely by TWO independent properties. Which two properties are independent? ! dependent on the phase of the substance in the system: single –phase or multiphase
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A pure substance and its phases Pure substance: a substance with a fixed chemical composition throughout all the thermodynamic processes under consideration. • Three principle phases
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Phase-Change Processes water liquid liquid vapor vapor Log(v [m 3 /kg]) v1=0.00099 m3/Kg V2=0.001 V4=1.67 V5=2.64
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Classification of system state COMPRESSED LIQUID : NOT about to vaporize (Sub-cooed liquid) e.g., water at 20 o C and 1 atmosphere SATURATED LIQUID : about to vaporize e.g., water at 100 o C and 1 atmosphere SATURATED MIXTURE : a system consisting of saturated multiple phases e.g, liquid-vapor, solid- vapor SATURATED VAPOR : about to condense e.g.,
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