Ch 6 and 8-pipe flows SP 13-1 - Convection Chapters 6 7 8 9...

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Elementary and Intermediate Algebra
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Chapter 2 / Exercise 100
Elementary and Intermediate Algebra
Tussy/Gustafson
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Convection Chapters 6, 7, 8, 9, 10, and 11 Chapter 6 Introduction Chapter 8 Internal Flows Chapter 7 External Flows 9 Free Convection Chapter 10 Condensation Chapter 11 Heat Exchangers
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Elementary and Intermediate Algebra
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Chapter 2 / Exercise 100
Elementary and Intermediate Algebra
Tussy/Gustafson
Expert Verified
Introduction to Convection: Flow and Thermal Considerations Chapter Six
Chapter 1 Review: Newton’s Cooling Law - Definition of convective heat transfer coefficient, h
Boundary Layer Features Boundary Layers: Velocity Boundary Layer What is the boundary layer? What is the shear stress at wall?
Boundary Layer Features (cont.) Thermal Boundary Layer ( ) 0.99 s t s T T y T T δ = What is the thermal boundary layer?
Velocity profiles in Laminar and Turbulent Flows
Local and Average Coefficients Local and Average Heat Transfer Coefficients Local Heat Flux and Coefficient : ( ) ʹ′ʹ′ = s s q h T T Average Heat Flux and Coefficient for a Uniform Surface Temperature : ( ) s s q hA T T = For a flat plate in parallel flow : 1 L o h hdx L =
Transition Transition from Laminar to Turbulent Flow (Chapter 7) Transition criterion for a flat plate in parallel flow: , critical Rey nolds number c x c u x Re ρ μ location at which transition to turbulence begins c x 10 5 < Re x , c < 3 × 10 6
Q: Does heat transfer increase or decrease with x?
Transition (cont.) Effect of transition on boundary layer thickness and local convection coefficient: Why does transition increase the boundary layer thickness? Why? Why?
Boundary Layer Equations How to Characterize the Boundary Layer Flows? Velocity Boundary Layer: 2 2 2 2 , u u p dp x dx x y << Thermal Boundary Layer: 2 2 2 2 T T x y <<
Example 6.5 Objectives: Determine h, the convective heat transfer coefficient on the outer wall of the blade. Given: Local heat flux = 95 kW/m 2 . T s = 800 o C through internal cooling.