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IEVref:113-04-37ID:
Language:enStatus: Standard
Term: density of heat flow rate
Synonym1: areic heat flow rate
[Preferred]
Synonym2:
Synonym3:
Symbol: φ
q
Definition: vector quantity with magnitude equal to the heat flow rate dΦ through a surface element divided by the area dA of the element, and direction eφ in the direction of propagation of heat, thus φ= dΦ dA e φ MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqk0di9Wr=fpeei0di9v8qiW7rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaGWadiab=v9aMjabg2 da9maalaaabaqcLbuacaGGKbGaeuOPdyeakeaajugqbiaacsgacaWG bbaaaOGaaCyzamaaBaaaleaacqaHvpGzaeqaaaaa@4418@

NOTE 1 At a fixed point in a medium, the direction of propagation of heat is opposite to the temperature gradient. At a point on the surface separating two media with different temperatures, the direction of propagation of heat is normal to the surface, from higher to lower temperatures.

NOTE 2 The coherent SI unit of density of heat flux rate is watt per square metre, W/m2.


Publication date:2011-04
Source:
Replaces:
Internal notes:2014-07-10: Symbol <!--><i>&phi;</i>, <i>q</i> corrected to <i>&phi;</i><br><i>q</i>. JGO

2017-06-02: Cleanup - Remove Attached Image 113-04-37en.gif
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