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#1 2014-02-07 20:55:50

mathaholic
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From: Juliania
Registered: 2012-11-29
Posts: 2,845
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Heat Transfer

Hello everybody, I just want to know more about conduction convection and radiation. Any meaning?


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#2 2014-02-08 08:07:44

ShivamS
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Registered: 2011-02-07
Posts: 3,557

Re: Heat Transfer

Hi mathaholic. Heat transfer is basically the transfer of thermal energy/heat through different places (also called physical systems). Heat requires a medium to move through methods such as conduction but through radiation it does not. It occurs in several ways such as the ones you mentioned along with advection. Conduction (also called diffusion) in the context of heat transfer is heat transferring between things which are physically in contact with each other. It occurs when atoms interact with atoms of another body (vibration between them), therefore transferring heat. There are two types: steady state and transient. Convection occurs when the energy is transferred due to moving fluids. Radiation, in simple terms, is energy transfer due to emitting and absorbing electromagnetic radiation. Advection occurs when you move an object containing energy. There are equations to calculate some of these things such as Fourier's law, using lumped capacitance model, the heat equation etc but you would need a bit more math and physics knowledge (at least PDEs).

Edit: A link you can use for more information is http://www.physicsclassroom.com/class/thermalP/u18l1e.cfm

Last edited by ShivamS (2014-02-09 08:40:27)

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#3 2014-02-08 22:17:43

Nehushtan
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From: London
Registered: 2013-03-09
Posts: 615
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Re: Heat Transfer

ShivamS wrote:

Unlike light, heat needs a medium to move.

Nope. Heat can be transferred through a vacuum. It does not need a medium to “move”.

Last edited by Nehushtan (2014-02-08 22:19:26)


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#4 2014-02-09 08:39:31

ShivamS
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Registered: 2011-02-07
Posts: 3,557

Re: Heat Transfer

Sorry, I meant that it needs a medium to move during convection and conduction. Radiation does not require a medium.

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