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HEAT TRANSFER: CONDUCTION. DUNMAN SECONDARY SCHOOL Science (Physics). Some Expectations. Respect Others Respect the School Humility. Work Ethic. DO participate and ask questions. For order in class, raise your hand when asking a question. BRING all specified books.

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heat transfer conduction

HEAT TRANSFER: CONDUCTION

DUNMAN SECONDARY SCHOOL

Science (Physics)

some expectations
Some Expectations
  • Respect Others
  • Respect the School
  • Humility
work ethic
Work Ethic
  • DO participate and ask questions. For order in class, raise your hand when asking a question.
  • BRING all specified books.
  • HAND IN all homework ON TIME! Failure to do so may result in consequences… (“Drink coffee” with Mr. Chew after school)
  • SHOW CARE and concern for each other. Help one another in homework. BUT NO COPYING OF ENTIRE ASSIGNMENTS!
why learn heat transfer
Why learn heat transfer?
  • Many applications in real life.

Example: Making of engines, refrigerators, air cooling systems…

soldier of tomorrow
SOLDIER OF TOMORROW
  • Soldier suits can regulate temperature!!
slide7
CHALLENGE!!

How do you place a piece of paper over a candle flame without the paper catching fire?

conduction
CONDUCTION
  • Conduction is the transfer of thermal energy without any flow of the material medium.
  • This is the main process by which thermal energy is transferred from one of the solid to another.
slide9
CONDUCTION

can occur by

Molecular Vibration

Free Electron Diffusion

molecular vibration
Molecular Vibration
  • Demonstration of molecular vibration.
  • What do you observe about the rate of transfer?
  • A slow process…
test your understanding
Test Your Understanding
  • Why are gases and liquids generally poor conductors of heat?

http://www.cartoonclipart.com/pages/girlread.html

insulators and conductors
Insulators and Conductors
  • Poor conductors are also called insulators.

Some examples: Water, Wood, Polystyrene.

free electron transfer
Free Electron Transfer
  • METALS contain many free electrons.
  • See Demostration
  • Rate of heat transfer is now faster. Why?
free electron diffusion
Free Electron Diffusion
  • When heated, the free electrons move faster and diffuse to into the cooler parts of the metal.
  • Kinetic energy is then transferred to the molecules by collision.
test your understanding15
Test Your Understanding
  • Why is copper a better conductor of heat than wood?
your research
Your research
  • What are some applications of:
    • Conductors
    • Insulators

in everyday life? (Choose one)

  • Do in groups of two or three.
your research17
Your Research
  • Presentation format – YOU DECIDE
    • Concept Maps with Pictures?
    • Short video? (Takes a long time… but if you can… why not?)
    • Research Paper?? (you sure???)
  • The point is: BE INNOVATIVE
  • Dateline: 20 Mar 2006 (Mon) 1300 hrs
what we have learnt
What we have learnt…
  • The main process by which thermal energy is transferred from one end of a solid to another is conduction.
  • Two mechanisms of conduction:
    • Molecular vibration
    • Free electron diffusion

Done by: Chew Yiming Clement

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