The four horsemen of heat transfer Contents:

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Presentation transcript:

The four horsemen of heat transfer Contents: Conduction Convection Evaporation Radiation

Conduction Heat transfer by contact Random wiggling Hot to cold Flow rate  T, A, material, 1/thickness Simulation Insulation prevents conduction Down/Synthetics Thickness Demo – Ice Melter blocks. Start the radiation demo. TOC

Convection Heat carried away by moving fluid Much faster than conduction Surface layers Examples: Sauna/cold lake Car radiator Cooling fans on computers Wind chill Firestorms Windbreakers slow down convection Demo – Heat Sinks and smoke box with candle TOC

Evaporation Heat transfer by phase change Cooling process Whee! Examples Cooling towers @ PSU Sweat Poly layers keep skin dry Cotton = death If you always lose the fastest… TOC

Radiation Hot objects radiate photons (black body radiation) Heating up a poker Bonfire/barn fire/stoves The sun Frost Silver lined blankets/bags reflect radiation back to you Demo – check temperatures on radiation demo TOC

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