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Unformatted text preview: Less than mm: Boundary layers - Sometimes we wish flows were more turbulent: to increase heat transfer or premix reactants. 1- And sometimes we wish we could decrease the levels of turbulence (to decrease drag). - And sometimes we just want to watch nature. Several methods exist for each desire. Turbulent control. Compliant coatings, suction Flow straighteners, Electromagnetic dampers Trip wires, nozzle shapes Roughening surfaces Understanding Turbulence has been called the last unsolved problem of classical physics Sir Horace Lamb (1932) said: “ I am an old man now and when I die and go to heaven there are two matters on which I hope for enlightenment. One is Quantum electrodynamics and another is the turbulent motion of fluids. And about the former I am optimistic.” 2...
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- Spring '09
- Mechanical Engineering