The dynamic viscosity of air is a physical property that is primarily dependent on temperature, not velocity. Under standard sea-level conditions at 15°C, the density of air is 1.225 kg/m³. The formula for calculating dynamic viscosity is given by the equation: Dynamic viscosity = (density * velocity * length) / Re, where Re is the Reynolds number. It is crucial to note that viscosity remains constant regardless of the airfoil's velocity.
PREREQUISITESStudents studying fluid dynamics, aerospace engineers, and anyone involved in the design and analysis of airfoils and aerodynamic systems.
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?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
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?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?
Like I said, it's a physical property of the air, independent of anything being done to the air.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?