Lec_10_Wk_6_Energy_conservation

Lec_10_Wk_6_Energy_conservation - 1 Chapter 3 Chapter 3 -...

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Unformatted text preview: 1 Chapter 3 Chapter 3 - Revision Revision Chapter 3 Chapter 3 - Revision Revision General mass balance: Accumulation = Creation – Destruction + Flow in – Flow out • For Non-reacting system: Accumulation = Flow in – Flow out • Difference between open and closed systems • Universe=system + surroundings • Steady state mass balance MZA@UTPChemEFluidMech • Unsteady state mass balance • Continuity equation Conservation of Energy Conservation of Energy Conservation of Energy Conservation of Energy Chapter 4&5 Lecture 10&11 Week 6 MZA@UTPChemEFluidMech 2 Outline Outline Outline Outline • Concept of First Law of Thermodynamics • General energy balance equation • Bernoulli’s equation • Application of energy balance: • Tank system • Nozzle and diffuser • Fluid flow measurement MZA@UTPChemEFluidMech The First Law of Thermodynamics The First Law of Thermodynamics The conservation of energy principle Energy cannot be created nor destroyed, but can be transferred from one form to another MZA@UTPChemEFluidMech 3 Types of energy Internal, u Kinetic, ke Apply in Fluid Mechanics Potential, pe Electrostatic Magnetic Surface MZA@UTPChemEFluidMech Nuclear • Energy is transferred in 3 ways: – By matter entering / leaving the system • (u + pe + ke) dm (u+pe+ke) in dm in MZA@UTPChemEFluidMech (u+pe+ke) out dm out 4 • Energy is transferred in 3 ways: – Via heat e.g. through the heating or cooling jacket • dQ MZA@UTPChemEFluidMech • Energy is transferred in 3 ways: – Via work of various forms • dW Compression Expansion MZA@UTPChemEFluidMech Electrical 5 Accumulation = Flow in – Flow out Δ E sys = E in – E out MZA@UTPChemEFluidMech d[m (u+pe+ke)] (u+pe+ke) in dm in (u+pe+ke) out dm out dQ in dQ out dW in dW out V dm 2 V gz u 2 V gz u m d 2 2 sys 2 ⎤ ⎡ ⎛ ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + = ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + in dW dQ dm 2 V gz u – out + + ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜...
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Lec_10_Wk_6_Energy_conservation - 1 Chapter 3 Chapter 3 -...

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