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Thermal Diffusivity Formula

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Thermal Diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. Check FAQs

α = \frac{K cond}{ρ \cdot C o}

α - Thermal Diffusivity?K_cond - Thermal Conductivity of Conduction?ρ - Density?C_o - Specific Heat Capacity?

Thermal Diffusivity Example

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Here is how the Thermal Diffusivity equation looks like with Values.

Here is how the Thermal Diffusivity equation looks like with Units.

Here is how the Thermal Diffusivity equation looks like.

0.4623 = \frac{10.19}{5.51 \cdot 4}

0.4623m²/s = \frac{10.19W/(m*K)}{5.51kg/m³ \cdot 4J/(kg*K)}

0.4623 = \frac{10.19}{5.51 \cdot 4}

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Thermal Diffusivity Solution

Follow our step by step solution on how to calculate Thermal Diffusivity?

FIRST Step Consider the formula

α = \frac{K cond}{ρ \cdot C o}

Next Step Substitute values of Variables

∴

α = \frac{10.19W/(m*K)}{5.51kg/m³ \cdot 4J/(kg*K)}

Next Step Prepare to Evaluate

∴

α = \frac{10.19}{5.51 \cdot 4}

Next Step Evaluate

∴

α = 0.462341197822142m²/s

LAST Step Rounding Answer

∴

α = 0.4623m²/s

Thermal Diffusivity Formula Elements

Variables

Thermal Diffusivity

Thermal Diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure.

Symbol: α

Measurement: DiffusivityUnit: m²/s

Note: Value can be positive or negative.

Formulas to find Thermal Diffusivity

Thermal Conductivity of Conduction

Thermal Conductivity of Conduction is the rate of heat passes through specified material.

Symbol: K_cond

Measurement: Thermal ConductivityUnit: W/(m*K)

Note: Value should be greater than 0.

Formulas to find Thermal Conductivity of Conduction

Density

The Density of a material shows the denseness of that material in a specific given area. This is taken as mass per unit volume of a given object.

Symbol: ρ

Measurement: DensityUnit: kg/m³

Note: Value should be greater than 0.

Formulas to find Density

Specific Heat Capacity

Specific Heat Capacity is the heat required to raise the temperature of the unit mass of a given substance by a given amount.

Symbol: C_o

Measurement: Specific Heat CapacityUnit: J/(kg*K)

Note: Value can be positive or negative.

Formulas to find Specific Heat Capacity

Other formulas in Transient Heat Conduction category

Go Heat Transfer through Plane Wall or Surface

q = - k 1 \cdot A c \cdot \frac{t o - t i}{w}

Go Total Emissive Power of Radiating Body

E b = (ε \cdot {(T e)}^{4}) \cdot [Stefan-BoltZ]

Go Radial Heat Flowing through Cylinder

Q = k 1 \cdot 2 \cdot π \cdot ΔT \cdot \frac{l}{\ln (\frac{r outer}{r inner})}

Go Radiative Heat Transfer

Q = [Stefan-BoltZ] \cdot SA Body \cdot F \cdot ({T 1}^{4} - {T 2}^{4})

How to Evaluate Thermal Diffusivity?

Thermal Diffusivity evaluator uses Thermal Diffusivity = Thermal Conductivity of Conduction/(Density*Specific Heat Capacity) to evaluate the Thermal Diffusivity, Thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the rate of transfer of heat in a material from the hot end to the cold end. Thermal Diffusivity is denoted by α symbol.

How to evaluate Thermal Diffusivity using this online evaluator? To use this online evaluator for Thermal Diffusivity, enter Thermal Conductivity of Conduction (K_cond), Density (ρ) & Specific Heat Capacity (C_o) and hit the calculate button.

FAQs on Thermal Diffusivity

What is the formula to find Thermal Diffusivity?

The formula of Thermal Diffusivity is expressed as Thermal Diffusivity = Thermal Conductivity of Conduction/(Density*Specific Heat Capacity). Here is an example- 0.462341 = 10.19/(5.51*4).

How to calculate Thermal Diffusivity?

With Thermal Conductivity of Conduction (K_cond), Density (ρ) & Specific Heat Capacity (C_o) we can find Thermal Diffusivity using the formula - Thermal Diffusivity = Thermal Conductivity of Conduction/(Density*Specific Heat Capacity).

Can the Thermal Diffusivity be negative?

Yes, the Thermal Diffusivity, measured in Diffusivity can be negative.

Which unit is used to measure Thermal Diffusivity?

Thermal Diffusivity is usually measured using the Square Meter Per Second[m²/s] for Diffusivity. Square Centimeter Per Second[m²/s], Square Millimeter per Second[m²/s] are the few other units in which Thermal Diffusivity can be measured.

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