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FLUID FLOW MOTION OF OBJECTS IN FLUIDS

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. Resultant F R. Lift F L. drag F D. Motion of object through fluid .

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FLUID FLOW MOTION OF OBJECTS IN FLUIDS

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  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. Resultant FR Lift FL drag FD Motion of object through fluid Fluid moving around stationary object FORCES ACTING ON OBJECT MOVING THROUGH FLUID

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

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

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

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

  7. 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)

  8. How can a plane fly?

  9. FLift = CL½ vs2A

  10. NO !!! rest in peace

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