Air drag on a wire moving lengthways

[cosmo123]

Can anyone help me work out the air resistence on a wire as it moves along its length? I think it would only experience skin friction if it moved like this and the wire was smooth, so does anyone know how to calculate this? I am having difficulty looking it up.

 

[Andy Resnick]

Interesting... I wonder if you can apply the solution to Stoke's first problem to this:

www.aa.washington.edu/courses/aa402/Chapter13.ppt[/URL]

 

[astrokreng]

Air drag, also known as air resistance, is the force that opposes the motion of an object through air. It is caused by the collision of air molecules with the surface of the object. In the case of a wire moving lengthways, the air drag will primarily be due to skin friction, which is the drag force caused by the shear stress between the wire's surface and the surrounding air.

To calculate the air drag on a wire, you can use the following equation:

F = ½ρAv²C

where F is the drag force, ρ is the density of air, A is the cross-sectional area of the wire, v is the velocity of the wire, and C is the drag coefficient.

The drag coefficient, C, is a dimensionless number that depends on the shape and smoothness of the wire's surface. For a smooth wire moving lengthways, the drag coefficient can range from 0.1 to 0.2.

To determine the cross-sectional area, A, you can use the formula for the area of a circle (assuming the wire is circular in shape):

A = πr²

where r is the radius of the wire.

By plugging in the appropriate values into the equation, you can calculate the air drag on the wire. Keep in mind that this calculation is an approximation and may not account for all factors, such as the wire's speed and the air turbulence caused by its movement.

I recommend consulting with a fluid dynamics expert or conducting experiments to get a more accurate estimation of the air drag on a wire moving lengthways. Additionally, there may be existing research or data on this topic that could provide more precise calculations. I suggest reaching out to academic journals or organizations in the field of fluid dynamics for further assistance.