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To my knowledge the only reason the flow is adhering is because you're pouring energy into that air to make it rotate into a vortex. Yes, it's pressing against the surface, but no, it's not reducing drag. In general you don't want to induce vortexes. You want to curve the surface gently enough to preserve laminar flow.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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