Laminar_versus_turbulent_flow - swirling eddies which are...

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Laminar Versus Turbulent Flow – A Comparison (Section 8-2, Ç engel and Cimbala) Laminar Flow Turbulent Flow Can be steady or unsteady. (Steady means that the flow field at any instant in time is the same as at any other instant in time.) Is always unsteady . Why? There are always random, swirling motions (vortices or eddies) in a turbulent flow. Note : However, a turbulent flow can be steady in the mean . We call this a stationary turbulent flow . Can be one-, two-, or three-dimensional. Is always three-dimensional . Why? Again because of the random
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Unformatted text preview: swirling eddies, which are in all directions. Note : However, a turbulent flow can be 1-D or 2-D in the mean . Has regular, predictable behavior Has irregular or chaotic behavior (cannot predict exactly – there is some randomness associated with any turbulent flow. Analytical solutions are possible (see Chapter 9). No analytical solutions exist! (It is too complicated, again because of the 3-D, unsteady, chaotic swirling eddies.) Occurs at low Reynolds numbers. Occurs at high Reynolds numbers....
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This note was uploaded on 07/23/2008 for the course ME 33 taught by Professor Cimbala during the Fall '05 term at Penn State.

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