PHYS1171 Lecture Notes - Lecture 6: Heat Transfer Coefficient, Thermal Conductivity, The Cooler
Document Summary
Conduction: the transfer of heat between two objects in contact with each other, the higher the temperature, the more the atoms/molecules vibrate. We often combine thermal conductivity with thickness to give the heat transfer coefficient for conduction, hconduction = k / d) 5. 67 10-8 j/(s m2k4), a is the surface area of the body, and t is the body"s temperature. Blackbodies absorb all radiation, and then re-emit all of the energy as thermal radiation: = 0: object is a whitebody. Whitebodies absorb no radiation, reflecting it all before the transfer of energy can be completed. The simpler expression is an approximation that applies when the temperature difference, T, is much less than the temperature (in kelvin) of the object"s surroundings. This is likely to be appropriate in everyday life. You are standing near a bitumen road on a hot summer"s day, and you feel a hot air current on your face.
