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Reference Viscosity Formula

GoReference Viscosity Given Reference Temperature Formula

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The Dynamic Viscosity of a fluid is the measure of its resistance to flow when an external force is applied. Check FAQs

μ viscosity = ε^{2} \cdot ρ ∞ \cdot V ∞ \cdot r nose

μ_viscosity - Dynamic Viscosity?ε - Emissivity?ρ_∞ - Freestream Density?V_∞ - Freestream Velocity?r_nose - Radius of Nose?

Reference Viscosity Example

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With units

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Here is how the Reference Viscosity equation looks like with Values.

Here is how the Reference Viscosity equation looks like with Units.

Here is how the Reference Viscosity equation looks like.

390.9269 = {0.95}^{2} \cdot 1.225 \cdot 68 \cdot 0.52

390.9269P = {0.95}^{2} \cdot 1.225kg/m³ \cdot 68m/s \cdot 0.52m

390.9269 = {0.95}^{2} \cdot 1.225 \cdot 68 \cdot 0.52

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Reference Viscosity Solution

Follow our step by step solution on how to calculate Reference Viscosity?

FIRST Step Consider the formula

μ viscosity = ε^{2} \cdot ρ ∞ \cdot V ∞ \cdot r nose

Next Step Substitute values of Variables

∴

μ viscosity = {0.95}^{2} \cdot 1.225kg/m³ \cdot 68m/s \cdot 0.52m

Next Step Prepare to Evaluate

∴

μ viscosity = {0.95}^{2} \cdot 1.225 \cdot 68 \cdot 0.52

Next Step Evaluate

∴

μ viscosity = 39.09269Pa*s

LAST Step Convert to Output's Unit

∴

μ viscosity = 390.9269P

Reference Viscosity Formula Elements

Variables

Dynamic Viscosity

The Dynamic Viscosity of a fluid is the measure of its resistance to flow when an external force is applied.

Symbol: μ_viscosity

Measurement: Dynamic ViscosityUnit: P

Note: Value should be greater than 0.

Formulas to find Dynamic Viscosity

Emissivity

Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95.

Symbol: ε

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Emissivity

Freestream Density

Freestream Density is the mass per unit volume of air far upstream of an aerodynamic body at a given altitude.

Symbol: ρ_∞

Measurement: DensityUnit: kg/m³

Note: Value can be positive or negative.

Formulas to find Freestream Density

Freestream Velocity

The Freestream Velocity is the velocity of air far upstream of an aerodynamic body, that is before the body has a chance to deflect, slow down or compress the air.

Symbol: V_∞

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Freestream Velocity

Radius of Nose

Radius of Nose is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length.

Symbol: r_nose

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Radius of Nose

Other Formulas to find Dynamic Viscosity

Go Reference Viscosity Given Reference Temperature

μ viscosity = ε^{2} \cdot ρ ∞ \cdot \sqrt{T ref} \cdot r nose

How to Evaluate Reference Viscosity?

Reference Viscosity evaluator uses Dynamic Viscosity = Emissivity^2*Freestream Density*Freestream Velocity*Radius of Nose to evaluate the Dynamic Viscosity, The Reference viscosity formula is defined as the product of freestream density, freestream velocity, and the universal gas constant. Dynamic Viscosity is denoted by μ_viscosity symbol.

How to evaluate Reference Viscosity using this online evaluator? To use this online evaluator for Reference Viscosity, enter Emissivity (ε), Freestream Density (ρ_∞), Freestream Velocity (V_∞) & Radius of Nose (r_nose) and hit the calculate button.

FAQs on Reference Viscosity

What is the formula to find Reference Viscosity?

The formula of Reference Viscosity is expressed as Dynamic Viscosity = Emissivity^2*Freestream Density*Freestream Velocity*Radius of Nose. Here is an example- 3909.269 = 0.95^2*1.225*68*0.52.

How to calculate Reference Viscosity?

With Emissivity (ε), Freestream Density (ρ_∞), Freestream Velocity (V_∞) & Radius of Nose (r_nose) we can find Reference Viscosity using the formula - Dynamic Viscosity = Emissivity^2*Freestream Density*Freestream Velocity*Radius of Nose.

What are the other ways to Calculate Dynamic Viscosity?

Here are the different ways to Calculate Dynamic Viscosity-

Dynamic Viscosity=Emissivity^2*Freestream Density*sqrt(Reference Temperature)*Radius of Nose

Can the Reference Viscosity be negative?

No, the Reference Viscosity, measured in Dynamic Viscosity cannot be negative.

Which unit is used to measure Reference Viscosity?

Reference Viscosity is usually measured using the Poise[P] for Dynamic Viscosity. Pascal Second[P], Newton Second per Square Meter[P], Millinewton Second per Square Meter[P] are the few other units in which Reference Viscosity can be measured.

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