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Emissivity given Reference Temperature Formula

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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. Check FAQs

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

ε - Emissivity?μ_viscosity - Dynamic Viscosity?ρ_∞ - Freestream Density?T_ref - Reference Temperature?r_nose - Radius of Nose?

Emissivity given Reference Temperature Example

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Here is how the Emissivity given Reference Temperature equation looks like with Values.

Here is how the Emissivity given Reference Temperature equation looks like with Units.

Here is how the Emissivity given Reference Temperature equation looks like.

0.9474 = \sqrt{\frac{351}{1.17 \cdot \sqrt{4652} \cdot 0.49}}

0.9474 = \sqrt{\frac{351P}{1.17kg/m³ \cdot \sqrt{4652K} \cdot 0.49m}}

0.9474 = \sqrt{\frac{351}{1.17 \cdot \sqrt{4652} \cdot 0.49}}

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Emissivity given Reference Temperature Solution

Follow our step by step solution on how to calculate Emissivity given Reference Temperature?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

ε = \sqrt{\frac{351P}{1.17kg/m³ \cdot \sqrt{4652K} \cdot 0.49m}}

Next Step Convert Units

∴

ε = \sqrt{\frac{35.1Pa*s}{1.17kg/m³ \cdot \sqrt{4652K} \cdot 0.49m}}

Next Step Prepare to Evaluate

∴

ε = \sqrt{\frac{35.1}{1.17 \cdot \sqrt{4652} \cdot 0.49}}

Next Step Evaluate

∴

ε = 0.947442060617038

LAST Step Rounding Answer

∴

ε = 0.9474

Emissivity given Reference Temperature Formula Elements

Variables

Functions

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

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

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

Reference Temperature

Reference Temperature is the Temperature at which the values of the physical properties of a fluid are chosen in dimensionless equations for the heat transfer, and resistance.

Symbol: T_ref

Measurement: TemperatureUnit: K

Note: Value should be greater than 0.

Formulas to find Reference Temperature

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

sqrt

A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.

Syntax: sqrt(Number)

Other Formulas to find Emissivity

Go Emissivity

ε = \sqrt{\frac{μ viscosity}{ρ ∞ \cdot V ∞ \cdot r nose}}

How to Evaluate Emissivity given Reference Temperature?

Emissivity given Reference Temperature evaluator uses Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*sqrt(Reference Temperature)*Radius of Nose)) to evaluate the Emissivity, The Emissivity given Reference Temperature formula is defined as dynamic viscosity of the fluid divided by the product of freestream density, square root of reference temperature, and the universal gas constant. Emissivity is denoted by ε symbol.

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

FAQs on Emissivity given Reference Temperature

What is the formula to find Emissivity given Reference Temperature?

The formula of Emissivity given Reference Temperature is expressed as Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*sqrt(Reference Temperature)*Radius of Nose)). Here is an example- 0.947442 = sqrt(35.1/(1.17*sqrt(4652)*0.49)).

How to calculate Emissivity given Reference Temperature?

With Dynamic Viscosity (μ_viscosity), Freestream Density (ρ_∞), Reference Temperature (T_ref) & Radius of Nose (r_nose) we can find Emissivity given Reference Temperature using the formula - Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*sqrt(Reference Temperature)*Radius of Nose)). This formula also uses Square Root (sqrt) function(s).

What are the other ways to Calculate Emissivity?

Here are the different ways to Calculate Emissivity-

Emissivity=sqrt(Dynamic Viscosity/(Freestream Density*Freestream Velocity*Radius of Nose))

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Emissivity given Reference Temperature Formula

​GoEmissivity Formula

Emissivity given Reference Temperature Example

Emissivity given Reference Temperature Solution

Emissivity given Reference Temperature Formula Elements

Other Formulas to find Emissivity

Other formulas in Computational Fluid Dynamic Solutions category

How to Evaluate Emissivity given Reference Temperature?

FAQs on Emissivity given Reference Temperature

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GoEmissivity Formula