class 14 new

# class 14 new - External Flow The Flat Plate in Parallel...

This preview shows pages 1–6. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: External Flow: The Flat Plate in Parallel Flow Chapter 7 Section 7.3 • Subject to prescribed boundary conditions, numerical solutions to the momentum and energy equations yield the following results for important local boundary layer parameters : ( 29 ( 29 1/ 2 1/ 2- with / 0.99 at 5. 5.0 5 / R e , ∞ ∞ = = = = x x u u vx u η δ 2 2 and / 0.332, d f d η η = = , 1/ 2 , 2 0.664Re / 2 x s x f x C u τ ρ- ∞ ≡ = ( 29 ( 29 1/ 2 * *- with / / / / x s s y h q T T k T y k u vx dT d η η ∞ ∞ = = ′′ =- = ∂ ∂ = * 1/ 3 and / 0.332 Pr for Pr 0.6, dT d η η = = 1/ 2 1/ 3 0.332 Re Pr x x x h x Nu k = = 1/ 3 r and P t δ δ = • Average Boundary Layer Parameters : 1/ 2 , 1.328 Re x f x C- = 1/ 2 1/ 3 0.664 Re Pr x x Nu = The effect of variable properties may be considered by evaluating all properties at the film temperature . Steel (AISI 1010) plates of thickness 6 mm and length L = 1 m on a side are cooled by atmospheric air of velocity u ∞ = 10 m/s and T ∞ = 20 o C in parallel flow. For an initial temperature of 300 o C, what is the rate of heat transfer from the plate? SCHEMATIC: Air T = 20 C...
View Full Document

{[ snackBarMessage ]}

### Page1 / 19

class 14 new - External Flow The Flat Plate in Parallel...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online