MINE2500 - Lecture 3 - MINE2500 – Fluid Mechanics and...

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Unformatted text preview: MINE2500 – Fluid Mechanics and Thermodynamics May 13, 2008 M I NE2500 – Thermodynamics (Lecture 3) Pure Substance Any substance with a fixed chemical composition throughout E.g. air is considered a pure substance, even though it has many elements. Phase-Change Process of Pure Substances T h e r m o d y n a m i c s 1 MINE2500 – Fluid Mechanics and Thermodynamics May 13, 2008 Heat (state 1) temp rises until 200 o C slight displacement of piston Saturated Liquid (State 2) Let piston move to keep pressure the same, letting temp rise. (specific volume increases) Saturated Liquid/Vapour mixture (State 3) keep adding more heat, it turns into vapour. Saturated Vapour (State 4) All is vapour. T h e r m o d y n a m i c s 2 MINE2500 – Fluid Mechanics and Thermodynamics May 13, 2008 o During a change in phase (no change in temp), heat is used to break the bonds – latent heat. State 5 pressure remains the same, but temperature rises. Graph: if pressure changes, same trend but not same path Saturation Temperature and Pressure Boiling point depends on pressure. T h e r m o d y n a m i c s 3 MINE2500 – Fluid Mechanics and Thermodynamics May 13, 2008 o E.g. pressure cooker is faster than cooking using heat methods....
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MINE2500 - Lecture 3 - MINE2500 – Fluid Mechanics and...

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