# Heat flux

n. The rate of energy transfer per unit area.

• Discussion

Heat flux is proportional to the temperature gradient (the difference in temperature between the two bodies or physical locations).  See Incropera and DeWitt (2002) for further discussion.

•

Preferred units for heat flux are kW/m2. Although heat flux and reaction intensity (an intermediate variable in Rothermel's fire spread model) share common units of measure, the two quantities are not the same.

• Incropera, F.P.; DeWitt, D.P. 2002. Fundamentals of heat and mass transfer. New York: Wiley and Sons.

• Notes

• Bret Butler, Mechanical Engineer

Rocky Mountain Research Station

• August 2007