.The total heat flowing out of a volume V per unit time is:
(Book: 5.9)
To figure out most flows, (some simple incompressible flows do not need it), we will need to use energy conservation in addition to mass and linear momentum conservation. That requires that heat conduction is considered.
The heat flux per unit area is called the heat flux vector .The total heat flowing out of a volume V per unit time is:
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(14) |