ln which of the following the friction drag is generally larger than pressure drag?

a circular disc or plate held normal to flow
a sphere
a cylinder
an airfoil

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 4 : an airfoil

Concept:

Skin Friction Drag

The drag on a body resulting from viscous shearing stresses (i.e., friction) over its contact surface (i.e., skin).
The drag of a very streamlined shape such as a thin, flat plate is frequently expressed in terms of a skin friction drag.
This drag is a function of Reynolds number.
An airfoil mainly experiences skin friction drag.

Form Drag (Pressure Drag)

The drag on a body resulting from the integrated effect of the static pressure acting normal to its surface resolved in the drag direction.
Unlike the skin friction drag that results from viscous shearing forces tangential to a body’s surface, form drag results from the distribution of pressure normal to the body’s surface.
In an extreme case of a flat plate normal to the flow, the drag is totally the result of an imbalance in the pressure distribution.

4 views Answered 2022-09-04 04:29

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