Aviation

[Amr Morsi]

How much viscosity is a part of the air resistance (naming)? Although surface is much away, surface of air and atmosphere?

[Ophiolite]

The translator program failred on this occassion. I have no idea what you are asking.

[Amr Morsi]

I mean for an aircraft. The surface of earth is much away, from the aircraft. I think it is still there, but this contradicts known laws of viscosity.

[CaptainPanic]

The surface of the earth is not relevant. The surface of the airplane, and the difference between the speed of the airplane and the air is the only thing that matters.

[Fuzzwood]

Ah you are asking about shear stress here: fluidum between 2 solid surfaces. Am I right? If so, it will not have any significant effect.

[ewmon]

Perhaps the OP refers to ground effect.

[Ophiolite]

Off topic post: I am at a loss to see how any of the posts in this thread merit a + award. I'm not complaining, just infinitely puzzled.

 

For consistency someone ought to give this post a + also.

Edited August 1, 2011 by Ophiolite

[Amr Morsi]

What laws do you know about viscosity, Ophiolite?

[Ophiolite]

I'm not smart enough to handle Navier-Stokes, so I just play around with approximations afforded by Bingham Plastic and Power Law models, which is fine for dealing with the hydraulics of drilling fluids.

[Amr Morsi]

Great! Thanks.

[Hal.]

Amr , do you think that the viscosity of what is surrounding an aircraft as it is in flight should include a factor which is dependent on the surface of the ground for it's value ? If so , why ?

[Amr Morsi]

It is either this either air-layers. But, viscosity is known to contain higher orders of velocity, rather than linear and square. Are there 2 reasons for viscosity? To solids and to layers of fluids. Or this is for liquids and this for gases?