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FLUID FLOW MOTION OF OBJECTS IN FLUIDS How can a plane fly? Why does a cricket ball swing or a baseball curve? Why does a golf ball have dimples? web notes:

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Presentation on theme: "FLUID FLOW MOTION OF OBJECTS IN FLUIDS How can a plane fly? Why does a cricket ball swing or a baseball curve? Why does a golf ball have dimples? web notes:"— Presentation transcript:

1 FLUID FLOW MOTION OF OBJECTS IN FLUIDS How can a plane fly? Why does a cricket ball swing or a baseball curve? Why does a golf ball have dimples? web notes: lect6a.ppt flow4.pdf flight.pdf

2 Lift F L drag F D Resultant F R Motion of object through fluid Fluid moving around stationary object FORCES ACTING ON OBJECT MOVING THROUGH FLUID

3 C D B A Uniform motion of an object through an ideal fluid (  = 0) The pattern is symmetrical  F R = 0

4 Drag force frictional drag (viscosity) pressure drag (eddies – lower pressure)

5 low pressure region high pressure region rotational KE of eddies  heating effect  increase in internal energy  temperature increases Drag force due to pressure difference NO CURVE Drag force is opposite to the direction of motion motion of air motion of object

6 low pressure region high pressure region Drag force due to pressure difference v v flow speed (high) v air + v  reduced pressure flow speed (low) v air - v  increased pressure v air (v ball ) Boundary layer – air sticks to ball (viscosity) – air dragged around with ball MAGNUS EFFECT motion of air motion of object

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8 Professional golf drive Initial speed v0 ~ 70 m.s-1 Angle ~ 6° Spin  ~ 3500 rpm Range ~ 100 m (no Magnus effect) Range ~ 300 m (Magnus effect)

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10 How can a plane fly?

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15 F Lift = C L ½  v s 2 A

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