Turbulent Jets

Turbulent Jets - Tornado So, simplify Empirical laws from...

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Turbulent Jets AME 341b Spring04
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Boundary-free shear flows ± Propulsion ± Mixing ± Transport
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Characteristics of FSF ± Technologically-important ± ± Hard to study ± Unstable, usually turbulent ± Poorly-understood!!!
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Characteristics of turbulence ± Complex, irregular ± Large range of scales ± High dissipation ± High diffusivity ± Large Re ± Governing equations well known ± Mathematical nightmare
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Turbulence and Re Re inertia viscosity ul ul ρ µ ν = =
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How to estimate Re ± Denominator is 0.15 in air, 0.01 in water (for cm) ± Multiply top line by 6 or 7 for air, 100 for water ± Cigarette ± Smokestack ±
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Unformatted text preview: Tornado So, simplify Empirical laws from experiment Greatly simplified physical models based on these results Evolution of a plane turbulent jet A simple model Potential core, unmixed Turbulent flow, mixed Potential flow Growth rate is self-similar Real jets (from Album of Fluid Motion) Summary Large number of problems in fluid mechanics have well-known governing equations, but complex solutions. Do experiments to construct simplified predictive models. To avoid unpleasant surprises, remember the assumptions....
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Turbulent Jets - Tornado So, simplify Empirical laws from...

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