Heat Flux in Heat Transfer Formulas

The Heat Flux is the rate of thermal energy transfer per unit area due to radiation, indicating how much heat is emitted from a surface. And is denoted by q. Heat Flux is usually measured using the Watt per Square Meter for Heat Flux Density. Note that the value of Heat Flux is always negative.

Formulas to find Heat Flux in Heat Transfer

fxHeat Exchange by Radiation due to Geometric ArrangementGo

fxBlack Bodies Heat Exchange by RadiationGo

List of variables in Heat Transfer formulas

fx Emissivity Go

fx Cross Sectional Area Go

fx Shape Factor Go

fx Temperature of Surface 1 Go

fx Temperature of Surface 2 Go

FAQ

What is the Heat Flux?

The Heat Flux is the rate of thermal energy transfer per unit area due to radiation, indicating how much heat is emitted from a surface. Heat Flux is usually measured using the Watt per Square Meter for Heat Flux Density. Note that the value of Heat Flux is always negative.

Can the Heat Flux be negative?

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

What 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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