class 23

# class 23 - Free Convection General Considerations and...

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Click to edit Master subtitle style 8/13/11 Free Convection: General Considerations and Results for Chapter 9 Sections 9.1 through 9.6.2

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8/13/11 Pertinent Dimensionless Parameters Ø Grashof Number: = Buoyancy force/viscous force Ø Rayleigh Number: 2 3 ) ( ν β L T T g Gr s L - να 3 ) ( Pr L T T g Gr Ra s L L - =
8/13/11 Vertical Plates Free Convection Boundary Layer Development on a Heated Plate : Ø Ascending flow with the maximum velocity occurring in the boundary layer and zero velocity at both the surface and outer edge. ( 29 ? s T T < The fluid close to the plate is _________ the fluid beyond it. a) Less dense than b) More dense than c) As dense as

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8/13/11 Form of the x -Momentum Equation for Laminar Flow Net Momentum Fluxes ( Inertia Forces) Buoyancy Force Viscous Force Ø Temperature dependence requires that solution for u ( x,y ) be obtained concurrently with solution of the boundary layer energy equation for T ( x,y ). The solutions are said to be coupled .
If we need to couple these two equations, what do we need to use? a)

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## This note was uploaded on 08/13/2011 for the course CHEM 3210 taught by Professor Degrazia during the Fall '10 term at Colorado.

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class 23 - Free Convection General Considerations and...

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