Drag And Lift Civil Engineering (CE) Notes | EduRev

Civil Engineering SSC JE (Technical)

Civil Engineering (CE) : Drag And Lift Civil Engineering (CE) Notes | EduRev

The document Drag And Lift Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Civil Engineering SSC JE (Technical).
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Chapter 12

 

DRAG AND LIFT

  •  The component of the force parallel to the direction of flow is called the drag & normal component is called the lift. 
  • Friction drag - when flow occurs past a flat surface at zero incidence, the fluid exerts a drag-force on the surface known as friction drag which is in downstream direction. 
  • Pressure drag - when flow occurs past a surface which is not everywhere parallel to the fluid stream a drag force results on account of difference of pressure over the body surface, known as pressure drag. 
  • Stream lined body has friction drag only whereas Bluff body has pressure drag only 
  • Total drag on the sphere is about one-third of the drag for the disc. 
  • Coefficient of drag and lift

 Drag And Lift Civil Engineering (CE) Notes | EduRev
Drag And Lift Civil Engineering (CE) Notes | EduRev
Drag And Lift Civil Engineering (CE) Notes | EduRev{when Re = 100}
Drag And Lift Civil Engineering (CE) Notes | EduRev 

  • Flow at very small Reynolds number is known as the creeping motion 
  • Boundary Layer Parameters in Laminar Conditions

Boundary Layer thickness (d) =

Drag And Lift Civil Engineering (CE) Notes | EduRev

Displacement thickness (d*) =
Drag And Lift Civil Engineering (CE) Notes | EduRev
Momentum thickness (q) =
Drag And Lift Civil Engineering (CE) Notes | EduRev
Local friction drag coefficient Cd* =
Drag And Lift Civil Engineering (CE) Notes | EduRev

Average friction drag coefficient Cd =
Drag And Lift Civil Engineering (CE) Notes | EduRev
Shear stress to =
Drag And Lift Civil Engineering (CE) Notes | EduRev

  •  Boundary Layer Parameters in Turbulent Conditions

 Drag And Lift Civil Engineering (CE) Notes | EduRev
Drag And Lift Civil Engineering (CE) Notes | EduRev

  •  The drag which depends upon profile and orientation of the airfoil, known as profile drag, whereas drag which depends upon the airfoil plan form & is induced by the lift force is known as induced force. 
  • The phenomenon of lift produced by imposing circulation over a uniform fluid steam is known as Magnus effect.

 

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