Question

In: Mechanical Engineering

( fluid lab) I need theory for Drag Coefficient and Effect of Angle of Attack on...

( fluid lab)
I need theory for

Drag Coefficient and Effect of Angle of Attack on sphere

Please in computer not hand writing

Solutions

Expert Solution

When a body is either unsymmetrical or has its axis not aligned with the flow direction, both the pressure and shear forces manifest. Their combined effect yields a resultant force F which can be resolved into lift and drag.

Drag force is defined by :-

Where CD is Drag Coefficient

All the information regarding shape of object and air is consider in drag coefficient

A given rigid body subjected to aerodynamic analysis can be characterized by its shape size and orientation relative to free stream velocity. The orientation is refered to as angle of attack

Sphere has symmetry along all the three axis therefore the angle of attack never varies. Infact the angle of attack for the sphere is always zero.


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