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Title:

Heat Transfer

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Heat Transfer Conduction, Convection, and Radiation Basic Guidelines Heat and Particle Movement Relationship Heat and Temperature Animated This simple animation ... – PowerPoint PPT presentation

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Title: Heat Transfer


1
Heat Transfer
  • Conduction, Convection, and Radiation

2
Basic Guidelines Heat and Particle Movement
Relationship
3
Heat and Temperature Animated
  • This simple animation shows what happens to these
    spheres (blue and yellow) when the temperature
    moves from 0 degrees Kelvin to 300 degrees
    Kelvin.
  • Note the speed of the smaller (yellow) particles
    increases faster than the larger (blue) ones.

4
Heat Transfer
  • Heat transfer is the movement of thermal energy
    from a warmer item to a cooler item.
  • Remember, heat moves in predictable ways, from a
    high to a low.

5
Three Heat Transfer Situations
  • Conduction
  • Convection
  • Radiation

6
Conduction
  • Conduction is heat transfer through solids.
  • Examples
  • Your feet transfer (conduct) heat to a cold tile
    floor
  • A spoon placed in hot soup becomes warmer as the
    spoon conducts heat away from the hot soup

7
Conduction examples
8
Convection
  • Convection occurs in fluids
  • A fluid is defined as a liquid or gas because
    fluids have the ability to flow from one place to
    another
  • Solids, however, maintain their position

9
Convection continued
  • Consider this - when you look at the road in the
    summertime on a hot day, you may notice that the
    air above the road looks blurry this is
    convection taking place as the hot air directly
    over the road absorbs the heat from the road and
    rises. Although the explanation can be quite
    complex, convection can help explain why mirages
    are seen in the desert.

10
(No Transcript)
11
Convection and Earth Science Connection
12
Radiation
  • Question If conduction deals with solids and
    convection deals with liquids, how does heat
    arrive to Earth from the Sun?
  • There is very little matter in between the Earth
    and Sun.

13
Radiation Diagram
14
Radiation continued
  • Heat can travel in waves without a medium (a
    liquid, solid, or gas).
  • Radiation is the term that describes heat
    movement without a medium of matter.

15
The Electromagnetic Spectrum
16
Radiation continued
  • All of the forms of electromagnetic energy in the
    spectrum can travel through the universe as waves
    we call this radiation.

17
Practical Applications
  • Discuss and explain how potholes are formed
  • Discuss the purpose of expansion joints on
    bridges and elevated roadways
  • Describe how a hot air balloon works
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