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Heat Transfer

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bob marley

on 4 March 2013

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Transcript of Heat Transfer

Heat Transfer 10.4 Summary - Heat is transmitted through the environment through conduction, convection and radiation
- Conduction is the transfer of heat through a solid or between a solid and another solid, a liquid or a gas that it is touching
- Convection is the transfer of heat through a fluid (a liquid or gas)
- Radiation (radiant energy) is the transfer of heat in the form of waves Three types of heat transfer The word transfer means to carry across. The 3 types of heat transfer are conduction, convection and radiation. Conduction Conduction is the transfer of heat through solids. Conduction also occurs between a solid and a liquid and a solid and a gas. conduction occurs in only one direction, (from a hotter substance to a cooler substance). An example would be a pot of soup on a stove. The heat from the element would transfer to the pot and then to the soup at the bottom of the pot. Convection In the example of the soup the particle at the bottom would begin to move around and start to puch up and out. Movement of Particles Then the particles at the bottom of the soup would start to rise while pushing the cooler particles to the side of the pot. When the warm particles that were rising reach the top then the heat begins to transfer to the air and they get pushed to the sides by the warmer particles rising from the bottom. This creates a pattern that continues as the soup heats up. The transfer of thermal energy through fluids (liquids/gases) is called convection. The circular pattern is called a convection current. Convection currents transfer heat from hotter substances to cooler substances. Convection Currents Affect your Life - In a house - (when you are in a room with a heater the first part of the room that gets warmer is near the heater then the warm air pushes up and out to the rest of the room. Then some of the heat is transferred to the walls, ceiling and floor. That air then cools and moves back down to the bottom and back towards the heater.
- In a pot of soup the heat from the element moves to the pot and then the heat from the pot moves to the bottom of the soup and that heat moves up and out and eventually gets to the top and cools, then it gets pushed out by more heat that is coming up and it moves down the sides Radiation Conduction and convection involve movement of particles whereas radiation uses invisible waves given off by an energy source. Thermal energy from the sun reaches the Earth through radiation. The invisible waves are called infrared waves, all hot solids, liquids and gases give off infrared waves. For example satellites that orbit the Earthy monitor infrared rays so they can determine pollution, weather, etc... Heat Transfer by Radiation
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