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Amount of heat energy transfer across unit area in unit time:

j_H = \frac{\delta E_H}{\delta A \cdot \delta t}


For the 
continuum body the heat flux model is adequately described by Fourier's law:

{\bf j}_H = \lambda \cdot {\bf \nabla} T

where

thermal conductivity of the continuum body


The heat flux  is related to heat flow  as:

j_H = \frac{q_H}{A}

 where

heat transfer area


See also


Physics / Thermodynamics / Heat Transfer / Heat flow

Heat Flux Conduction @ model (Fourier's law) ]