3 Mechanisms for Heat Transfer

Let's go back to our example of the cup
filled with hot tea left in a room at 25oC.

We have already discussed how heat flow will transfer the energy from the tea to the surrounding air until the system reaches

thermal equilibrium

System boundary
Hot Cup
of Tea
Surrounding Air
T = 25oC
Hot cup of tea.
Heat transfer from the tea to the surroundings is indicated by this arrow
We have not discussed the mechanisms involved in heat transfer.
In what ways can heat be transferred?
Mechanisms for Heat Transfer
  1. Conduction

    - Fourier's Law
  2. Convection

    - Newton's Law of cooling
  3. Radiation

    - Stefan-Boltzmann Law
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Ch 4, Lesson B, Page 14 - 3 Mechanisms for Heat Transfer