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Intro. to Convection

# Intro. to Convection - Introduction to Convection ME 114...

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Introduction to Convection ME 114

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Flow around a cylinder http://www.featflow.de/album/circles.html
Merger of Pipe Flows http://www.featflow.de/album/pipes.html

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Instability of a Jet From “An Album of Fluid Motion” Van Dyke

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Categories of Convection In convection, heat flow is caused by a combination of conduction and fluid motion (advection) Forced or Free Convection Forced: flow caused by pump, fan, wind, etc. Free (natural): motion caused by buoyancy (hot air rises) Internal or External Flow Internal: inside pipes or other enclosures External: flow around the outside of a surface What are some products that rely on convection?
Basic Equation Newton’s Law of Cooling h: average heat transfer coefficient over a surface Remember that h is high where boundary layers are thin and decreases as the boundary layer thickness grows h=f( ) h x = local heat transfer coefficient (at one specific point) For a flat plate ( 29 - = T T hA Q s s A z , y , x s dA h A 1 h s = = L 0 x dx h L 1 h

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Non-dimensionalization Nusselt number Where δ = some length scale such as length L or diameter D What does Nu stand for physically??
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Intro. to Convection - Introduction to Convection ME 114...

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