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 [email protected] • 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 [email protected] 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 [email protected] 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 [email protected] 3 Types of energy Internal, u Kinetic, ke Apply in Fluid Mechanics Potential, pe Electrostatic Magnetic Surface [email protected] Nuclear • Energy is transferred in 3 ways: – By matter entering / leaving the system • (u + pe + ke) dm (u+pe+ke) in dm in [email protected] (u+pe+ke) out dm out 4 • Energy is transferred in 3 ways: – Via heat e.g. through the heating or cooling jacket • dQ [email protected] • Energy is transferred in 3 ways: – Via work of various forms • dW Compression Expansion [email protected] Electrical 5 Accumulation = Flow in – Flow out Δ E sys = E in – E out [email protected] 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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