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es_joe
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How to calculate the dynamic viscosity of air at high alttitudes,i want to calculate it at hight 4000m abovesea level at that hight the temp. is 262 kelven degrees.
Any thoughts?
Any thoughts?
Viscosity (kilogram per metre second)
Viscosity is needed to determine kinematic viscosity as shown in the next item.
mALT = (1.458x10-6 x TALT3/2) / TALT + 110.4
where: mALT = viscosity (kg/ms) at altitude (h)
Kinematic Viscosity (square metre per second)
The coefficient of kinematic viscosity is used in determination of Reynolds Number It is evaluated by the ratio:-
nALT = mALT / rALT
where: nALT = coefficient of kinematic viscosity at altitude (m2/s)
Dynamic viscosity is a measure of the resistance of a fluid to flow under an applied force. It is a property that determines how easily a fluid can be deformed or moved.
The dynamic viscosity of air at a specific altitude can be calculated using the Sutherland's Law of the variation of viscosity with temperature. This equation takes into account the temperature and pressure at the given altitude to calculate the dynamic viscosity.
The dynamic viscosity of air at a certain altitude is important in various engineering and scientific applications, such as in the design of aircrafts and understanding the flow of air in different environments. It also plays a role in weather forecasting and atmospheric studies.
The dynamic viscosity of air decreases with increasing altitude. This is because the air at higher altitudes is less dense and therefore has less resistance to flow. This decrease in viscosity can also be attributed to the decrease in temperature with increasing altitude.
The unit of measurement for dynamic viscosity is Pascal-second (Pa·s) in the SI system, or poise (P) in the CGS system.