EGN_3358_Notes_Ch_7_Part 1

EGN_3358_Notes_Ch_7_Part 1 - 1 EGN-3358 –...

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Unformatted text preview: 1 EGN-3358 – Thermo-Fluids-Heat Transfer EGN 3358 Thermo-Fluids-Heat Transfer Chapter 7: Internal Flows – Fluid Viscous and Thermal Effects Part 1 2 EGN-3358 – Thermo-Fluids-Heat Transfer 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 a h z g V g P g V g P + + + ⋅ = + ⋅ 2 2 2 2 ρ ρ 3 EGN-3358 – Thermo-Fluids-Heat Transfer Introduction 4 EGN-3358 – Thermo-Fluids-Heat Transfer Introduction ( 29 ( 29 ∫ ∫ ∫ ∫ ≡ ≡ ≡ i d A i i i i A d d d d L dA r y u A V dA r y u A V h , 1 , 1 system the in loss head total : Where diameter infinite of reservoir a to d, diameter, of duct the from fluid the of expansion to due is loss exit The negligible is → → i V 5 EGN-3358 – Thermo-Fluids-Heat Transfer 7.2: Viscous Effects in the Entrance Region of a Duct flow) the of exit and entrance the with d (associate loss minor (2) friction) to (due loss major (1) : of composed is L h μ ρ Ud = Re ( 29 2300 Re , = cr mean V ( 29 P A d c h 4 perimeter wetted area sectional- cross 4 : diameter Hydraulic = ≡ 6...
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EGN_3358_Notes_Ch_7_Part 1 - 1 EGN-3358 –...

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