What is the dynamic viscosity of air?

Angelina21
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Homework Statement


Considering an airfoil (a flat plate) flying at 100 m/s under sea-level conditions, so the density is 1.225 kg/m3 and the length being 1 m, what is the dynamic viscosity of air? The problem is that I have two variables in one formula, Reynolds number and the viscosity.

Homework Equations


Dynamic viscosity=(density*velocity*length)/Re

The Attempt at a Solution

 
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Angelina21 said:

Homework Statement


Considering an airfoil (a flat plate) flying at 100 m/s under sea-level conditions, so the density is 1.225 kg/m3 and the length being 1 m, what is the dynamic viscosity of air? The problem is that I have two variables in one formula, Reynolds number and the viscosity.

Homework Equations


Dynamic viscosity=(density*velocity*length)/Re

The Attempt at a Solution

What is the temperature? You are aware that, under these conditions, the dynamic viscosity (a physical property of the air) is a unique function of temperature that you can look up on line, right?
 
Chestermiller said:
What is the temperature? You are aware that, under these conditions, the dynamic viscosity (a physical property of the air) is a unique function of temperature that you can look up on line, right?
The temperature according to sea level conditions is 15oC. I'm aware that it's online. But doesn't the viscosity depend on velocity? Or it's always constant, no matter the velocity?
 
Angelina21 said:
The temperature according to sea level conditions is 15oC. I'm aware that it's online. But doesn't the viscosity depend on velocity? Or it's always constant, no matter the velocity?
Like I said, it's a physical property of the air, independent of anything being done to the air.
 

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