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Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

Mechanical Engineering SSC JE (Technical)

Mechanical Engineering : Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

The document Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).

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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

Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

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

Boundary Layer thickness (d) =
Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

Displacement thickness (d*) =
Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

Momentum thickness (q) =
Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

Local friction drag coefficient Cd* =
Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

Average friction drag coefficient Cd =

Shear stress to =
Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering Notes | EduRev

 Boundary Layer Parameters in Turbulent Conditions

Chapter 12 Drag And Lift - Fluid Mechanics, Mechanical Engineering Mechanical Engineering 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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