Heat Transfer - Research Article from Macmillan Encyclopedia of Energy

Bill Buford
This encyclopedia article consists of approximately 10 pages of information about Heat Transfer.
This section contains 2,775 words
(approx. 10 pages at 300 words per page)
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Heat Transfer

Heat transfer is the energy flow that occurs between bodies as a result of a temperature difference. There are three commonly accepted modes of heat transfer: conduction, convection, and radiation. Although it is common to have two or even all three modes of heat transfer present in a given process, we will initiate the discussion as though each mode of heat transfer is distinct.

Conduction

When a temperature difference exists in or across a body, an energy transfer occurs from the high-temperature region to the low-temperature region. This heat transfer, q, which can occur in gases, liquids, and solids, depends on a change in temperature, ΔT, over a distance, Δx (i.e., ΔT/Δx) and a positive constant, k, which is called the thermal conductivity of the material. In equation form, the rate of conductive heat transfer per unit area is written...

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This section contains 2,775 words
(approx. 10 pages at 300 words per page)
Buy the Heat Transfer Encyclopedia Article
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Macmillan Encyclopedia of Energy
Heat Transfer from Macmillan Encyclopedia of Energy. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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