MEC ENG 106 Lecture Notes - Lecture 1: Newtonian Fluid, Hydrostatics, Shear Stress
24 Aug 2016
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Suppose you are washing the dishes and you ve wiped a plate clean. While the plate is still a little wet, sprinkle some flour over. While your breath may blow over and against it, now flow will pass under the water and cannot lift the water up. Golf balls have dimples that allow that allow them to travel faster with lower resistance, but pollen whiskers have an increased resistance. The key difference is that golf balls are typically hit to high speed motion whereas the pollen puffs are much slower. Consider that you can blow a candle out, but you cannot suck it out. Suspension (not quite liquid because of tiny blood cells, about 40 micrometres diameter) Cold water is more viscous than hot water. Even plane engines perform better through cold denser air than in hot air. Fluid definition: substance that deforms continuously under shear force. Shear stress (tau) = viscosity (mu) * velocity (u) / distance (y)
