Emissivity Calculator

✖The Dynamic Viscosity of a fluid is the measure of its resistance to flow when an external force is applied.ⓘ Dynamic Viscosity [μ_viscosity]			+10% -10%
✖Freestream Density is the mass per unit volume of air far upstream of an aerodynamic body at a given altitude.ⓘ Freestream Density [ρ_∞]			+10% -10%
✖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.ⓘ Freestream Velocity [V_∞]			+10% -10%
✖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.ⓘ Radius of Nose [r_nose]			+10% -10%

✖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.ⓘ Emissivity [ε]

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Formula

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Emissivity

Formula

`"ε" = sqrt("μ"_{"viscosity"}/("ρ"_{"∞"}*"V"_{"∞"}*"r"_{"nose"}))`

Example

`"0.930447"=sqrt("375P"/("1.225kg/m³"*"68m/s"*"0.52m"))`

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Emissivity Solution

STEP 0: Pre-Calculation Summary

Formula Used

Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*Freestream Velocity*Radius of Nose))
ε = sqrt(μ_viscosity/(ρ_∞*V_∞*r_nose))
This formula uses 1 Functions, 5 Variables

Functions Used

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., sqrt(Number)

Variables Used

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.
Dynamic Viscosity - (Measured in Pascal Second) - The Dynamic Viscosity of a fluid is the measure of its resistance to flow when an external force is applied.
Freestream Density - (Measured in Kilogram per Cubic Meter) - Freestream Density is the mass per unit volume of air far upstream of an aerodynamic body at a given altitude.
Freestream Velocity - (Measured in Meter per Second) - 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.
Radius of Nose - (Measured in Meter) - 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.

STEP 1: Convert Input(s) to Base Unit

Dynamic Viscosity: 375 Poise --> 37.5 Pascal Second (Check conversion here)
Freestream Density: 1.225 Kilogram per Cubic Meter --> 1.225 Kilogram per Cubic Meter No Conversion Required
Freestream Velocity: 68 Meter per Second --> 68 Meter per Second No Conversion Required
Radius of Nose: 0.52 Meter --> 0.52 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

ε = sqrt(μ_viscosity/(ρ_∞*V_∞*r_nose)) --> sqrt(37.5/(1.225*68*0.52))

Evaluating ... ...

ε = 0.930446617355189

STEP 3: Convert Result to Output's Unit

0.930446617355189 --> No Conversion Required

FINAL ANSWER

0.930446617355189 ≈ 0.930447 <-- Emissivity

(Calculation completed in 00.004 seconds)

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Created by Sanjay Krishna

Amrita School of Engineering (ASE), Vallikavu

Sanjay Krishna has created this Calculator and 300+ more calculators!

Verified by Maiarutselvan V

PSG College of Technology (PSGCT), Coimbatore

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< 11 Computational Fluid Dynamic Solutions Calculators

Emissivity given Reference Temperature

Go Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*sqrt(Reference Temperature)*Radius of Nose))

Nose Radius of Coordinate System given Reference Temperature

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

Freestream Density given Reference Temperature

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

Reference Temperature given Emissivity

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

Reference Viscosity Given Reference Temperature

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

Emissivity

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

Nose Radius of Coordinate System

Go Radius of Nose = Dynamic Viscosity/(Emissivity^2*Freestream Density*Freestream Velocity)

Freestream Velocity

Go Freestream Velocity = Dynamic Viscosity/(Emissivity^2*Freestream Density*Radius of Nose)

Freestream Density

Go Freestream Density = Dynamic Viscosity/(Emissivity^2*Freestream Velocity*Radius of Nose)

Reference Viscosity

Go Dynamic Viscosity = Emissivity^2*Freestream Density*Freestream Velocity*Radius of Nose

Reference Temperature given Freestream Velocity

Go Reference Temperature = Freestream Velocity^2

Emissivity Formula

Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*Freestream Velocity*Radius of Nose))
ε = sqrt(μ_viscosity/(ρ_∞*V_∞*r_nose))

What is emissivity?

Emissivity is the measure of an object's ability to emit infrared energy. Emitted energy indicates the temperature of the object. Emissivity can have a value from 0.

How to Calculate Emissivity?

Emissivity calculator uses Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*Freestream Velocity*Radius of Nose)) to calculate the Emissivity, The Emissivity formula is defined as the dynamic viscosity of the fluid divided by the product of freestream density, freestream velocity, and the universal gas constant. Emissivity is denoted by ε symbol.

How to calculate Emissivity using this online calculator? To use this online calculator for Emissivity, enter Dynamic Viscosity (μ_viscosity), Freestream Density (ρ_∞), Freestream Velocity (V_∞) & Radius of Nose (r_nose) and hit the calculate button. Here is how the Emissivity calculation can be explained with given input values -> 0.153453 = sqrt(37.5/(1.225*68*0.52)).

FAQ

What is Emissivity?

The Emissivity formula is defined as the dynamic viscosity of the fluid divided by the product of freestream density, freestream velocity, and the universal gas constant and is represented as ε = sqrt(μ_viscosity/(ρ_∞*V_∞*r_nose)) or Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*Freestream Velocity*Radius of Nose)). The Dynamic Viscosity of a fluid is the measure of its resistance to flow when an external force is applied, Freestream Density is the mass per unit volume of air far upstream of an aerodynamic body at a given altitude, 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 & 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.

How to calculate Emissivity?

The Emissivity formula is defined as the dynamic viscosity of the fluid divided by the product of freestream density, freestream velocity, and the universal gas constant is calculated using Emissivity = sqrt(Dynamic Viscosity/(Freestream Density*Freestream Velocity*Radius of Nose)). To calculate Emissivity, you need Dynamic Viscosity (μ_viscosity), Freestream Density (ρ_∞), Freestream Velocity (V_∞) & Radius of Nose (r_nose). With our tool, you need to enter the respective value for Dynamic Viscosity, Freestream Density, Freestream Velocity & Radius of Nose and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Emissivity?

In this formula, Emissivity uses Dynamic Viscosity, Freestream Density, Freestream Velocity & Radius of Nose. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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