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Originally Posted by Aaron Burton
About the water carrying heat but not conducting-- I'm not exactly sure what you mean by that. Since heat is just internal kinetic energy, in order for a particle to be "carrying" it, it needs to be conducting it. Perhaps I'm just misunderstanding you? Could you elaborate?
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What is happening is that the water posesses internal kinetic energy (i.e. is hot). There are three methods of heat transfer - conduction, convection and radiation. In the case of a fluid at this sort of temperature, convection is the most significant. In a water block you effectively have forced convection - the working fluid (water) is being forced along. This overwhelms all the other heat transfer mechanisms within the water at this sort of temperature/water velocity.
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Originally Posted by Aaron Burton
But doesn't that mean that the heat from the stagnant water is being somewhat transferred to the bulk flow?
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The water is unlikely to be totally stagnant - there will be some mixing with the bulk flow. However, if it was totally stagnant what would happen is that the water would just sit there at the same temperature as the metal around it, having effectively no cooling effect.
I'm not quite sure if that's what you wanted to know. If it isn't, get back to me.