Class19 - Heat Transfer Processes We now know a little...

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2/20/12 Oregon State University PH 202, Lecture 19 1 Heat Transfer Processes We now know a little something now about how to calculate the results of a heat transfer. But what about the process of the transfer itself? How does it happen— and how fast? There are three basic processes: Convection Conduction Radiation
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2/20/12 Oregon State University PH 202, Lecture 19 2 Convection In a convection process, heat is moved by bulk (large-scale mass) movement within a fluid . This is heat flow through a fluid once that heat has already entered the fluid —a transfer of energy from one part of the fluid to another. The original heat flow into the fluid usually happens via another process (e.g. conduction or radiation). Examples : Boiling liquid Smoke rising from a fire Atmospheric thermals Cold air sinking in a freezer Wind chill Calculating the mass movement within a convecting fluid is very complex. It depends not only on the chemistry of the fluid but also on the geometry of the situation.
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2/20/12
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This note was uploaded on 03/10/2012 for the course PH 202 taught by Professor Staff during the Winter '08 term at Oregon State.

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Class19 - Heat Transfer Processes We now know a little...

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