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- University physics volume 2
- Unit 1. thermodynamics
- Temperature and heat
- Mechanisms of heat transfer
Problem-solving strategy: effects of heat transfer
- Examine the situation to determine what type of heat transfer is involved.
- Identify the type(s) of heat transfer—conduction, convection, or radiation.
- Identify exactly what needs to be determined in the problem (identify the unknowns). A written list is useful.
- Make a list of what is given or what can be inferred from the problem as stated (identify the knowns).
- Solve the appropriate equation for the quantity to be determined (the unknown).
- For conduction, use the equation
.
[link] lists thermal conductivities. For convection, determine the amount of matter moved and the equation
, along with
or
if a substance changes phase. For radiation, the equation
gives the net heat transfer rate.
- Substitute the knowns along with their units into the appropriate equation and obtain numerical solutions complete with units.
- Check the answer to see if it is reasonable. Does it make sense?
Check Your Understanding How much greater is the rate of heat radiation when a body is at the temperature
than when it is at the temperature
?
The radiated heat is proportional to the fourth power of the
absolute temperature . Because
and
, the rate of heat transfer increases by about 30% of the original rate.
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Source:
OpenStax, University physics volume 2. OpenStax CNX. Oct 06, 2016 Download for free at http://cnx.org/content/col12074/1.3
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