ch7 part 1 - Thermo-Fluids Heat Transfer Chapter 7 Internal...

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Unformatted text preview: Thermo-Fluids Heat Transfer Chapter 7: Internal Flows – Fluid Viscous and Thermal Effects Part 1 .1: Introduction 7.1: Introduction Consider: If the duct exits to the atmosphere, the steady, incompressible one-D energy equation (1 st law of thermodynamics) becomes: L d d a i i a h z g V g P z g V g P + + + = + + 2 2 2 2 ρ ρ 2 EGN 3358 - Thermo-Fluids Heat Transfer .1: Introduction 7.1: Introduction EGN 3358 - Thermo-Fluids Heat Transfer 3 .1: Introduction 7.1: Introduction Where: ≡ L h Total head loss in the system ∫∫ ≡ d A d d d d dA r y u A V ) , ( 1 A 1 (Averages) ∫∫ ≡ i A i i i i dA r y u A V ) , ( negligible → V i is negligible → The exit loss is due to expansion of the fluid from the duct of the diameter, d, to a reservoir of infinite diameter EGN 3358 - Thermo-Fluids Heat Transfer 4 7.2: Viscous Effects in the Entrance Region of a Duct h L is composed of: 1) Major loss (due to friction) 2) Minor loss (associated with the entrance and exit of the flow) μ ρ Ud = Re (V mean , Re cr = 2300) Hydraulic diameter: P A perimeter wetted area tional cross d c h 4 ) sec ( 4 = − ≡ EGN 3358 - Thermo-Fluids Heat Transfer 5 7.2: Viscous Effects in the Entrance Region of a Duct Entrance length:...
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This note was uploaded on 04/02/2010 for the course EGN 3358 taught by Professor Sleiti during the Spring '07 term at University of Central Florida.

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ch7 part 1 - Thermo-Fluids Heat Transfer Chapter 7 Internal...

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