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17 Fall

3. Macroscopic Theory of Heat Transfer I

조영달 2017.09.29 13:46 조회 수 : 13

•Heat represents a quantity of energy being transferred
between two bodies by conduction, radiation, and
convective circulation.
• Heat transfer is the energy flow across the boundaries
of a system under a temperature difference.
• The temperature T is a quantity of heat energy that
describes thermal equilibrium. The degree or intensity
of heat present in a substance or object, especially as
expressed according to a comparative scale : If
system A is in thermal equilibrium with system B, then
system A and system B have the same temperature.
• Determining temperature on small length scales can
be challenging in this regard. And we will follow the
macroscopic (classical) description, introduced in Ch.
1.2 and 1.3 of G. Chen.
• There exist three basic modes of heat transfer:
conduction, convection, and thermal radiation. We
briefly review the classical laws. 

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