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Heat Flux Formula

GoNewton's Law of Cooling Formula

GoOne Dimensional Heat Flux Formula

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Heat Flux is the heat transfer rate per unit area normal to the direction of heat flow. It is denoted by the letter "q". Check FAQs

q = k o \cdot \frac{T}{l}

q - Heat Flux?k_o - Thermal Conductivity of Fin?T - Temperature of Conductor?l - Length of Conductor?

Heat Flux Example

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Here is how the Heat Flux equation looks like with Values.

Here is how the Heat Flux equation looks like with Units.

Here is how the Heat Flux equation looks like.

78.6636 = 10.18 \cdot \frac{85}{11}

78.6636W/m² = 10.18W/(m*K) \cdot \frac{85K}{11m}

78.6636 = 10.18 \cdot \frac{85}{11}

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Heat Flux Solution

Follow our step by step solution on how to calculate Heat Flux?

FIRST Step Consider the formula

q = k o \cdot \frac{T}{l}

Next Step Substitute values of Variables

∴

q = 10.18W/(m*K) \cdot \frac{85K}{11m}

Next Step Prepare to Evaluate

∴

q = 10.18 \cdot \frac{85}{11}

Next Step Evaluate

∴

q = 78.6636363636364W/m²

LAST Step Rounding Answer

∴

q = 78.6636W/m²

Heat Flux Formula Elements

Variables

Heat Flux

Heat Flux is the heat transfer rate per unit area normal to the direction of heat flow. It is denoted by the letter "q".

Symbol: q

Measurement: Heat Flux DensityUnit: W/m²

Note: Value can be positive or negative.

Formulas to find Heat Flux

Thermal Conductivity of Fin

Thermal Conductivity of Fin is rate of heat passes through Fin, expressed as amount of heat flows per unit time through a unit area with a temperature gradient of one degree per unit distance.

Symbol: k_o

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

Note: Value should be greater than 0.

Formulas to find Thermal Conductivity of Fin

Temperature of Conductor

Temperature of Conductor is the degree or intensity of heat present in a heat conductor.

Symbol: T

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Temperature of Conductor

Length of Conductor

Length of Conductor is the measure of length of wire.

Symbol: l

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Length of Conductor

Other Formulas to find Heat Flux

Go Newton's Law of Cooling

q = h t \cdot (T w - T f)

Go One Dimensional Heat Flux

q = - \frac{k o}{t} \cdot (T w2 - T w1)

Other formulas in Heat Transfer and Psychrometry category

Go Heat Transfer

Q h = \frac{T vd}{R th}

Go Heat Transfer According to Fourier's Law

Q c = - (k \cdot A s \cdot \frac{ΔT}{L})

Go Total Thermal Resistance for Conduction through Three Resistances in Series

R se = R 1 + R 2 + R 3

Go Total Thermal Resistance for Conduction through Two Resistances in Series

R th = R 1 + R 2

How to Evaluate Heat Flux?

Heat Flux evaluator uses Heat Flux = Thermal Conductivity of Fin*Temperature of Conductor/Length of Conductor to evaluate the Heat Flux, Heat flux or thermal flux, sometimes also referred to as heat flux density, heat-flow density or heat flow rate intensity is a flow of energy per unit of area per unit of time. Heat Flux is denoted by q symbol.

How to evaluate Heat Flux using this online evaluator? To use this online evaluator for Heat Flux, enter Thermal Conductivity of Fin (k_o), Temperature of Conductor (T) & Length of Conductor (l) and hit the calculate button.

FAQs on Heat Flux

What is the formula to find Heat Flux?

The formula of Heat Flux is expressed as Heat Flux = Thermal Conductivity of Fin*Temperature of Conductor/Length of Conductor. Here is an example- 78.66364 = 10.18*85/11.

How to calculate Heat Flux?

With Thermal Conductivity of Fin (k_o), Temperature of Conductor (T) & Length of Conductor (l) we can find Heat Flux using the formula - Heat Flux = Thermal Conductivity of Fin*Temperature of Conductor/Length of Conductor.

What are the other ways to Calculate Heat Flux?

Here are the different ways to Calculate Heat Flux-

Heat Flux=Heat Transfer Coefficient*(Surface Temperature-Temperature of Characteristic Fluid)
Heat Flux=-Thermal Conductivity of Fin/Wall Thickness*(Temperature of Wall 2-Temperature of Wall 1)

Can the Heat Flux be negative?

Yes, the Heat Flux, measured in Heat Flux Density can be negative.

Which unit is used to measure Heat Flux?

Heat Flux is usually measured using the Watt per Square Meter[W/m²] for Heat Flux Density. Kilowatt per Square Meter[W/m²], Watt per Square Centimeter[W/m²], Watt per Square Inch[W/m²] are the few other units in which Heat Flux can be measured.

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