EGN_3358_Notes_Ch_5_Part 2

EGN_3358_Notes_Ch_5_Part 2 - EGN 3358 Thermo-Fluids-Heat...

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1 EGN-3358 – Thermo-Fluids-Heat Transfer EGN 3358 Thermo-Fluids-Heat Transfer Chapter 5: Control Volume Analysis Part 2
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2 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of the SSSF Energy Equation – Bernoulli Equation Valid for: 1)Steady state 2)Flow is reversible and adiabatic, that is it is inviscid and HT = 0 and 3) 4) Incompressible flow 0 = l h 0 = W Equation Bernoulli z g V g P z g V g P d i + + = + + 2 2 2 2 ρ
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3 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of the SSSF Energy Equation – Bernoulli Equation Define streamline : line in the flow along which the fluid velocity vectors are tangent at a given instant of time When the flow is steady state, the streamlines also represent the path of the fluid particles.
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4 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of the SSSF Energy Equation – Bernoulli Equation Consider flow in a horizontal tube: 2 1 z z = T P V P V P = + = + 2 2 2 2 2 2 1 1 ρ pressure static pressure dynamic pressure total Physically, stagnation pressure is the static pressure that will occur at a point in a fluid if the fluid at that point is brought to rest (V = 0) by a reversible and adiabatic process.
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5 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of the SSSF Energy Equation – Bernoulli Equation Techniques for measuring static and stagnation pressure: The pilot-static probe is used to measure velocity: ( 29 ρ P P V T - = 2 2 2 V P P From T + =
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6 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of the SSSF Energy Equation – Bernoulli Equation Solve: 5-40E (HW)
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7 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of SSSF Energy Equation – Fluids at Rest (Fluid Statics) 0 = V Examples: 1.) Determination of the pressure variation and, hence, the force behind a dam 2.) The use of manometers to measure the pressure at a point in a moving fluid Equation Bernoulli and SSSF 2 2 2 2 1 2 1 1 2 2 z g V g P z g V g P + + = + + ⋅ ρ ρ 0 2 1 = = V V Where ( 29 1 2 2 1 z z g P P - = - ρ
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8 EGN-3358 – Thermo-Fluids-Heat Transfer Special Case of SSSF Energy Equation – Fluids at Rest (Fluid Statics) Solve: 5-42E 5-49 (HW) 5-53 (HW) 5-59 (HW)
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9 EGN-3358 – Thermo-Fluids-Heat Transfer 5.7: The Second Law of Thermodynamics for a Control Volume T Q dt dS sys RTT D One to in s M and S With - = Φ = = Φ ϕ ( 29 ( 29 i d sys s m s m dt dS - = dt dS dt dS Where CV sys =
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10 EGN-3358 – Thermo-Fluids-Heat Transfer
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This note was uploaded on 11/25/2011 for the course EGN 3358 taught by Professor Sleiti during the Fall '07 term at University of Central Florida.

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EGN_3358_Notes_Ch_5_Part 2 - EGN 3358 Thermo-Fluids-Heat...

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